- 1Instituto de Geofísica, Unidad Michoacán, Universidad Nacional Autónoma de México, Morelia, Michoacán, México
- 2Institute of Geophysics and Planetology, University of Hawai, Honolulu, HI, United States
The Michoacán–Guanajuato volcanic field (MGVF) in the western Trans-Mexican Volcanic Belt is one of the largest and most diverse monogenetic volcanic fields in the world holding more than 1200 volcanic vents. Its eruptive activity goes back to 7 Ma, it is considered an active volcanic field, and the composition of its rocks varies from mafic to silicic. It is essential to understand the geochemical evolution of its products, the complex petrogenetic processes, and the origin of magmas in central Mexico. Although these processes are linked to the subduction of the Cocos plate beneath the North American plate, the magmatic plumbing system of the MGVF remains not completely understood. The MGVF has been studied for decades, focusing in its dominant intermediate magmas. Nevertheless, the origin and evolution of the mafic components and their relation with the intermediate rocks have been poorly discussed. Here, we compile geological and geochemical data of the MGVF to discuss the petrogenesis of mafic magmas along the volcanic field and the role they play in the generation of intermediate melts. We used data published for 429 samples of mafic and intermediate volcanic rocks. Conventional procedures and statistical techniques were used to process the dataset. We propose that MGVF mafic magmas are derived from low degrees (∼1–15%) of partial melting of a spinel-bearing lherzolite source/mantle related to the rapid ascent of the asthenosphere caused by an extensional regime that is present in the area. In contrast, intermediate magmas where divided into two main groups based on the Mg content: high-Mg intermediate rocks, which seems to be derived from different rates of assimilation and fractional crystallization process, and low-Mg intermediate rocks, which can be related to fractional crystallization of mafic magmas. In addition, mafic and intermediate magmas display a chemical diversity which is related to mantle heterogeneity domains in the mantle wedge.
1 Introduction
The Trans-Mexican Volcanic Belt (TMVB) is a magmatic province in North America, which extends from the Gulf of Mexico to the Pacific coast (Figure 1A; Robin, 1982; Verma, 2000; Gómez-Tuena et al., 2007; Ferrari et al., 2012; Verma, 2015).
FIGURE 1. (A) Map of the Trans-Mexican Volcanic Belt (TMVB) along with the plate tectonic setting of southern Mexico (modified after Verma, 2015), showing the MGVF area (red square box). The numbers 20, 40, and 60 represent the depth in km of the subducted slab beneath the southern region of Mexico. Faults and fracture zones: TZR, Tepic-Zacoalco Rift; CR, Colima Rift; ChR, Chapala Rift; TCFS, Tula–Chapala fault system; VF, Veracruz fault; SSFP, Strike-Slip fault province; PMFS, Polochic–Motagua fault system; and GCA, graben of Central America. Abbreviations: T, Tepic; V, Veracruz; EAP, Eastern Alkaline Province; LTVF, Los Tuxtlas Volcanic Field; MAT, Middle America Trench; and CAVA, Central American Volcanic Belt. The thick black arrows represent relative motions at plates. The strike-slip vectors and other normal faults are also shown schematically. (B) Michoacán–Guanajuato volcanic field (MGVF) showing the mafic and intermediate volcanic rocks. Abbreviations: M, Morelia; Pt, Pátzcuaro; Ir, Irapuato; Za, Zacapu. TrG, Tarímbaro graben; LCf, La Colina fault; Pf, Paloma fault; CuG, Cuitezeo half graben; ZaG, Zacapu graben; and Qf, Quiroga fault.
Different tectonic models have been proposed and debated to explain the evolution and genesis of the TMVB (Márquez et al., 1999a, 1999b; Ferrari and Rosas-Elguera, 1999; Sheth et al., 2000; Blatter et al., 2001; Ferrari et al., 2002; Verma, 2002; Torres-Alvarado and Verma, 2003; Gómez-Tuena et al., 2018). Some of these models include the conventional subduction-related origin (e.g., Molnar and Sykes, 1969; Negendank et al., 1985; Suarez and Singh, 1986; Pardo and Suárez, 1995; Gómez-Tuena et al., 2003; Carrasco-Núñez et al., 2005), as well as alternative models such as a fracture-related origin (e.g., Mooser and Maldonado-Koerdel, 1961; de Cserna, 1971), rift-related origin (e.g., Shet et al., 200; Márquez et al., 2001; Velasco-Tapia and Verma 2013; Verma, 2002, 2004, 2009, 2015), plume-related origin (e.g., Moore et al., 1994; Márquez et al., 1999a), and slab-detachment model (Ferrari, 2004).
Several monogenetic volcanic fields extend across the TMVB, such as Mascota, Acatlán, Sierra de Chichinautzin, Valle de Bravo, and Xalapa (e.g., Gómez-Tuena et al., 2007; Ferrari et al., 2012). The biggest monogenetic volcanic field in the TMVB is the Michoacán–Guanajuato volcanic field (MGVF; Figure 1B). In addition, the MGVF is one of the most prominent monogenetic volcanic areas in the world in terms of size, variety of volcanic styles, and magma compositions (Hasenaka and Carmichael, 1985).
Previous studies in the MGVF have focused on its geochemical characterization, geochronology, petrology, and eruptive dynamics (e.g., Luhr and Lazzar, 1985a; Luhr and Carmichael, 1985b; Hasenaka and Carmichael, 1987; Luhr et al., 1989; Cébria et al., 2011; Chevrel et al., 2016; Rasoazanamparany et al., 2016; Larrea et al., 2017, 2019; Losantos et al., 2017; Avellán et al., 2020; Bólos et al., 2020; Bólos et al., 2021; Ramírez-Uribe et al., 2021; Reyes-Guzmán et al., 2021; Sosa-Ceballos et al., 2021). Nevertheless, the petrogenesis and relation of the mafic and intermediate volcanic rocks of the MGVF and their tectonic implication with the TMVB is still a debated topic (e.g., Luhr and Lazzar, 1985a; Luhr and Carmichael, 1985b; Hasenaka and Carmichael, 1987; Luhr et al., 1989; Cébria et al., 2011; Chevrel et al., 2016; Hernández-Bernal et al., 2016; Rasoazanamparany et al., 2016; Losantos et al., 2017; Ramírez-Uribe et al., 2021; Sosa-Ceballos et al., 2021). In this work, we compiled published bulk rock compositions, mineral chemistry, and isotopic data from all over the MGVF and evaluated geochemical models to contribute to unravel the petrogenesis of magmas in Mexico.
2 Geological setting
The TMVB is an E-W continental volcanic arc originated by the oblique convergence of the Cocos, Rivera, and North American plates (Demant 1978; Ferrari and Rosas-Elguera, 1999). It is defined as a Miocene–Holocene volcanic province, comprising ∼8000 volcanic structures, that extends over ∼1000 km long across the central part of Mexico (Ferrari et al., 2012; Velasco-Tapia and Verma, 2013; Ortega-Gutiérrez et al., 2014; Verma et al., 2013).
The MGVF is one of the largest monogenetic volcanic fields on Earth covering ∼40,000 km2, in the west-central section of the TMVB (Hasenaka and Carmichael, 1985; Valentine and Connor, 2015; Sosa-Ceballos et al., 2021). It contains the youngest continental volcano in Mexico, Paricutin cinder cone (Foshang and González, 1956; Cebriá et al., 2011; Rowe et al., 2011; Larrea et al., 2017; Bolós et al., 2021, 2021). It consists in more than 1200 vents with a large variety of volcanic structures, such as scoria cones, maar craters, medium-size shield volcanoes, lava domes, and lava flows (Hasenaka and Carmichael 1987; Hasenaka 1994; Guilbaud et al., 2012; Mahgoub et al., 2017; Bolós et al., 2021; Sosa-Ceballos et al., 2021).
The MGVF occurs in an extensional tectonic environment which may be related to the sinistral rotation of the Michoacán block due to the oblique convergence of the Cocos plate relative to the North American plate (Singh and Pardo, 1993; Sosa-Ceballos et al., 2021). The MGVF is constrained by two main fault systems: the Morelia–Acambay with ENE-WSW and NE trending faults and the Taxco–San Miguel with NNW-SSE and NW-SE striking faults (Alanís-Álvarez et al., 2002; Sosa-Ceballos, et al., 2021). The structural system between these two main faults consists of a complex arrangement of fault zones that control the kinematics of different regional blocks (e.g., Johnson and Harrison, 1989, 1990; Pasquaré et al., 1991; Garduño-Monroy et al., 2009; Guilbaud et al., 2012; Kshirsagar et al., 2016; Sosa-Ceballos et al., 2021). The magmatic distribution of the MGVF might be controlled by this tectonic configuration (e.g., Bolós et al., 2020; Gómez-Vasconcelos et al., 2020).
The magmatism of the MGVF started in the Late Pliocene, although its activity increases from the Pleistocene through the Holocene (Hasenaka and Carmichael 1985; Ban et al., 1992; Guilbaud et al., 2012; Siebe et al., 2014; Pola et al., 2015; Osorio-Ocampo et al., 2018). Hasenaka and Carmichael (1985) estimated a magma discharge rate of 0.8 km3/1 ka for the last 40 ka in the whole MGVF. However, Guilbaud et al. (2012) proposed rates from 0.34 to 0.39 km3/1 ka for the last 10 ka in the Tacámbaro zone (10% of the entire MGVF), suggesting a highly variable magma discharge rate in space and time, or heterogeneous spatial distribution of volcanoes (Guilbaud et al., 2011).
The youngest volcanic activity within the MGVF occurred at Jorullo (1759–1774) and Parícutin (1943–1952) volcanoes, both located in zones with a high density of volcanic vents (Hasenaka and Carmichael 1985; Guilbaud et al., 2011). The occurrence of these young volcanoes and the two recent seismic swarms in 2020 and 2021 in the Uruapan area highlights the high probability of a new monogenetic eruption in the short to medium term within this region.
Most of the magmas that erupted in the MGVF belong to the calc-alkaline series, characteristic of subduction zones (Hasenaka and Carmichael 1987; Gómez-Tuena et al., 2005; Bolós et al., 2015; Gómez-Tuena et al., 2018). However, there are some volcanic products that belong to the alkaline series, distinctive from primitive OIB magmas (Hasenaka and Carmichael 1987), especially in the northern part of the MGVF (Ortega-Gutierrez et al., 2014; Losantos et al., 2015). The rocks of the MGVF are predominantly intermediate, and 40% of all known rocks are andesites and 33% are basaltic andesites (Sosa-Ceballos et al., 2021). Previous studies proposed that the mafic and intermediate magmas erupted were derived from partial melting of a heterogeneous mantle contaminated with subducted sediments and oceanic crust (Gilbaud et al., 2019; Larrea et al., 2021), partial melting of the deep crust (Ownby et al., 2011), assimilation and fractional crystallization (AFC) processes (McBirney and TaylorArmstrong, 1987; Agrawal et al., 2008; Ceibrá et al., 2011; Losantos et al., 2017), and fractional crystallization (Luhr and Carmichael, 1985b; Johnson et al., 2008). According to Sosa-Ceballos et al. (2021), felsic magmas could be related to the accumulation of intermediate magmas and the assimilation of granodiorites–granites favored by extensional–transtensional tectonics within the upper crust (e.g., Pérez-Orozco et al., 2018).
3 Database and processing procedures
The database from mafic and intermediate volcanic rocks from the MGVF was constructed from different literature sources. Major element composition, including rare earth element and trace element compositions, of 429 samples (Supplementary Tables S2, S3) were compiled from Anderson et al. (1974; n = 1); Avellan et al. (2020; n = 13); Carmichael et al. (2006; n = 4); Cebria et al. (2011; n =12); Chesley et al. (2002; n =12); Chevrel et al. (2016; n = 27); Corona-Chavez et al. (2006; n = 2); Freydier et al. (2000; n = 8); Gomez-Vasconcelos et al. (2015; n = 17); Guilbaud et al. (2019; n = 12); Hasenaka and Carmichael (1985; n = 5); Hasenaka and Carmichael (1987; n = 26); Hernández-Bernal et al. (2016; n = 5); Kshirsagar et al. (2015; n = 30); Lapierre et al. (1992; n = 3); Larrea et al. (2017; n =7); Larrea et al. (2019; n = 18); Lassiter and Luhr (2001; n = 2); Losantos et al. (2014; n = 11); Losantos et al. (2017; n = 47); Luhr and Lazzar, 1985a; n = 10); Luhr and Carmichael, 1985b; n = 10); Luhr et al. (1989; n = 4); McBirney and TaylorArmstrong, 1987; n = 11); Perez-Orozco et al. (2018; n = 10); Ramírez-Uribe et al. (2019; n = 26); Ramírez-Uribe et al. (2021; n = 13); Rasoazanamparany et al. (2016; n = 27); Rowe et al. (2011; n = 10); Verma and Hasenaka (2004; n = 28); and Wilcox (1954; n = 18).
Isotopic data (Sr-Nd and Pb) of 142 samples were compiled from Anderson et al. (1974; n = 1); Cebria et al. (2011; n = 12); Chesley et al. (2002; n = 12); Chevrel et al. (2016; n = 6); Guilbaud et al. (2019; n = 12); Hernández-Bernal et al. (2016; n = 3); Lapierre et al. (1992; n = 2); Lassiter and Luhr (2001; n = 4); Losantos et al. (2017; n = 33); Luhr et al. (1989; n = 2); McBirney and TaylorArmstrong, 1987; n = 11); Rasoazanamparany et al. (2016; n = 26); Verma and Verma (2018; n = 17).
Major element compositions were processed using the IgRoCS software (Verma and Rivera-Gómez, 2013), to assign rock nomenclature according to the IUGS (Le Bas et al., 1986; Le Maitre et al., 2002). The use of the IgRoCS software allows the subdivision of Fe into two oxidation varieties (FeO and Fe2O3) and the calculation of Fe2O3/FeO ratios following the Middlemost (1989) option for Fe oxidation adjustment. The adjustment of the sum to 100% anhydrous basis and the calculation of the CIPW norm as a standard igneous norm, were also achieved with this software. The use of 100% adjusted data on an anhydrous basis and the Fe oxidation adjustment minimizes the effects of analytical errors and element mobility (e.g., post-emplacement alteration and compositional changes during grinding of rock samples in the laboratory; Irvine and Baragar (1971)) and make more reliable and consistent use of the diagram of total alkali versus silica.
In order to report the mean and standard deviation, we used the UDASyss 3.2.2 software (Rosales-Rivera et al., 2019), which is a computer program used for data processing of experimental data. This software has been used in diverse scientific fields (e.g., igneous petrology, geochemistry of sands and sediments, and clinical and cognitive neuroscience). UDASyss 3.2.2 (Rosales-Rivera et al., 2019) comprises a model to calculate statistical parameters and dispersion estimates; in addition, this software is capable of efficiently and automatically applying the recursive discordancy and significance tests (F, t, and ANOVA) for statistical processing of experimental data. Therefore, in the present study, we used this software to develop discordancy tests at a strict 99% confidence level of the mean, which is helpful to determine the most confinable mean and standard deviation values from each rock type from the analyzed dataset (Verma, 2020). Statistical synthesis of geochemical compositional information of mafic and intermediate volcanic rocks is reported in Supplementary Tables S6, S7.
4 Results
4.1 Petrography and mineral chemistry
Previous petrographic studies show that the MGVF mafic rocks display porphyritic textures with mineral assemblages conformed by olivine, plagioclase, clinopyroxene, and orthopyroxene phenocrysts (Hasenaka and Carmichael, 1987; Luhr et al., 1989; Verma and Verma., 2013; Guilbaud et al., 2019). Olivine phenocrysts in mafic volcanic rocks display variable compositions, Fo43–88 (Supplementary Table S1; Pola et al., 2014; Larrea et al., 2017; Guilbaud et al., 2019).
Different authors show that intermediate volcanic rocks from the MGVF (Wilcox, 1954; Luhr and Carmichael, 1985b; Hasenaka and Carmichael, 1987; Kelemen, 1995; Verma and Hasenaka, 2004; Chevrel et al., 2016; Reyes-Guzmán et al., 2021) comprise a mineral assemblage characterized by clinopyroxene, dominantly augite and diopside (Wo1–48; Supplementary Table S2; Figure 2A), orthopyroxene with clinoenstatite composition (En31–99; Supplementary Table S2; Figure 2A), plagioclase with disequilibrium textures and albite–bytownite composition (An3–83; Supplementary Table S3; Figure 2B), and scarce olivine phenocryst (Fo62–88; Figure 2B; Supplementary Table S1; Wilcox, 1954, Luhr and Carmichael, 1985b; Hasenaka and Carmichael, 1987; Verma and Agrawal, 2011; Chevrel et al., 2016).
FIGURE 2. (A) Compositional variations of pyroxene from the MGVF intermediate volcanic rocks. Abbreviations: En, enstatite; Fs, ferrosilite; and Wo, wollastonite. (B) Compositional variations of feldspar in MGVF intermediate magmas. Abbreviations: An, anorthite; Ab, albite; and Or, orthoclase.
4.2 Rock-type classification and major elements
About 5 % of the analyzed rocks (n = 22) from the MGVF are mafic, alkaline, and sub-alkaline, with values that display SiO2 = 47.1–51.6 wt% and Mg# = 34–78 (Supplementary Table S4). Furthermore, 95 % of the analyzed rocks have an intermediate composition with SiO2 = 50.7–62.9 wt% and Mg# = 32–94. We further divided the intermediate magmatic group into two groups: 1) high-Mg intermediate magmas and 2) low-Mg intermediate magmas.
4.2.1 Mafic magmatic group
Rocks forming this group are basalt and trachybasalt (Figure 3A), some of which have high-K calc-alkaline and shoshonite affinity (Figure 3B). Alkaline mafic rocks displays contents of SiO2 = 48.3–50.1 wt%; MgO = 4.3–7.5 wt,%; K2O = 0.9–2.1 wt%; and Mg# = 47–66, whereas sub-alkaline rocks contain SiO2 = 49.8–51.8 wt%; MgO = 5.5–9.1 wt%; K2O = 0.1–1.3 wt%; and Mg# = 50–73. Both styles of mafic magmas (alkaline and sub-alkaline) are olivine and diopside normative (Supplementary Tables S4, S7).
FIGURE 3. (A) Total alkali–silica classification diagram for the volcanic rocks from the MGVF (TAS; Le Bas et al., 1986). (B) Bivariate diagram of K2O(adj)–SiO2(adj) diagram of Peccerrillo and Taylor (1976).
4.2.2 High-Mg intermediate magmatic group
This group comprises basaltic andesite, andesite, basaltic trachyandesite, and trachyandesite (Figure 3A) and is mainly composed of confidence levels at 99% (CL99) of SiO2 = 56.1–57.1 wt%; MgO = 5.0–5.4 wt%; K2O = 1.1–1.2 wt%; and Mg# = 75.1–78.7. This rock group is diopside normative (Supplementary Table S4).
4.2.3 Low-Mg intermediate magmatic group
This group comprises basaltic andesite, andesite, and trachyandesite compositions (Figure 3A). It is characterized by CL99 values of SiO2 = 57.1–58.3; MgO= 3.5–3.8; K2O = 1.6–1.7; and Mg# = 57.4–58.1. Like the other groups, this is diopside normative (Supplementary Table S4).
4.3 Trace and rare earth elements
Average vales of chondrite-normalized rare earth elements (REEs) and trace elements were used to elaborate chondrite-normalized REEs diagrams (Figures 4A,C) and multielement-normalized diagrams (Figures 4B,D).
FIGURE 4. (A,B) Chondrite-normalized rare earth element (REE) and primitive mantle–normalized multielement diagram for mafic magmas from MGVF. (C,D) Chondrite-normalized rare earth element (REE) and primitive mantle–normalized multielement diagram for intermediate magmas from MGVF. The chondrite and primitive mantle values from normalization are taken from McDonough and Sun (1995).
4.3.1 Mafic magmatic group
The mafic magma group exhibit light REE–enriched patterns with a relatively flat heavy REE trend and lacks Eu anomalies ([Eu/Eu]* = 0.8–1.1), where [Eu/Eu]* =
Primitive mantle–normalized multielement patterns (Figure 4B) show a flat slope between highly incompatible elements and more compatible elements. Alkaline mafic rocks exhibit low Nb [(Nb/Nb* = 0.6–1.2), where Nb/Nb*=
4.3.2 High-Mg intermediate magmatic group
Average values of this group present an enrichment in light REE, show a relatively small negative Eu anomaly ([Eu/Eu]* = 0.9–1; [La/Yb]CN = 5.3–6.1), and display a flat pattern in heavy REE (Figure 4C). This group is characterized by total REE concentrations of 72–83.6 ppm. It is remarkable the great similarity between the chondrite-normalized REE patterns of this group and the mafic magmatic group (Figure 4A), especially with the alkaline mafic rocks (Figure 4A).
Primitive mantle–normalized multielement patterns show enrichment in highly incompatible elements with a semi-horizontal trend to more compatible trace elements (Figure 4D). It displays similarities to the mafic magmatic group, especially in the absence of high negative anomalies of high-field strength elements (HFSE; i.e., Nb/Nb* = 0.1–0.2; Supplementary Table S7).
4.3.3 Low-Mg intermediate magmatic group
This magmatic group has an enrichment trend in light REE (Figure 4C), with a LREE–HREE semi-horizontal trend, and lacks negative Eu anomalies ([Eu/Eu]* = 0.8–0.9; [La/Yb]CN = 7.7–8.3; Figure 4C). Total REE concentrations of this group range from 106.3 to 117 ppm (Supplementary Table S7). The primitive mantle-normalized multielement diagram of this group reveals enrichment in highly incompatible elements relative to more compatible elements (Figure 4D). This trend can be comparable to the spectrum of the mafic magmatic group (Figure 4D). Moreover, trace element average concentrations of the low-Mg intermediate magmatic group lack negative anomalies of HFSE (Nb/Nb* = 0.1–0.2; Supplementary Table S7).
4.4 Radiogenic isotopes of Sr, Nd, and Pb
Sr–Nd isotope data of the MGVF mafic and intermediate volcanic rocks (Supplementary Table S5) were plotted in the conventional (87Sr/86Sr) vs. (144Nd/143Nd) diagram (Figure 5A), together with isotopic data from different island arcs and continental rifts compiled by Verma (2015). The mafic and intermediate magma groups of the MGVF are related to the mantle array (Figure 5A).
FIGURE 5. (A) Sr–Nd isotope plot for volcanic rocks from MGVF. (B) Pb–Pb isotope diagram for volcanic rocks from MGVF. Abbreviations: BSE, bulk silicate Earth; EMII, enriched mantle type-II; and NHRL, Northern Hemisphere Reference Line. BSE and EMII are taken from Faure (1986), and NHRL values are from Zindle and Hart (1986). Data from Central American Volcanic Arc (CAVA), continental rifts (Abu, Gabra, China, East Africa, Ethiopia, Turkey (Kula), Basin and Range, Colorado Plateau, Rio Grande, and Utah), and other arcs (Aleutians, Fiji, Lesser Antilles, Mariana, Papua New Guinea, Philippines, and Sunda-Banda) are form the compilation made by Verma (2015).
Lead isotopic data were plotted in the conventional bivariate diagram of (206Pb/204Pb) vs. (207Pb/204Pb) (Figure 5B). The MGVF rocks are plotted, same as the Sr–Nd diagram, together with values of different continental rifts and island arcs (Verma, 2015). The Northern Hemisphere Reference Line (NHRL; Zindler and Hart, 1986) was also plotted in this diagram as a reference. On the (206Pb/204Pb) vs. (207Pb/204Pb) diagram the MGVF mafic and intermediate rocks do not display a systematic difference between them and are mainly plotted between the NHRL line and the EM II field (Figure 5B).
5 Discussion
5.1 Origin of the mafic magmatism
The origin and evolution of the MGVF mafic rocks have been studied in different regions such as in the Jorullo–Tacámbaro zone and in the northwest of the city of Morelia (e.g., Losantos et al., 2017; Guilbaud et al., 2019; Avellán et al., 2020); however, despite the amount of geochemical data available in the literature, such as the study elaborated by Hasaneka and Carmichael (1987), a comprehensive understanding of the volcanic field is still far from being complete. For example, Blatter and Hammersley (2010) developed a complete study of the Tzitzio Gap; however, we lack a study that integrates general observations and structural features with geochemical characteristics and develops quantitative models of mafic volcanic rocks for the volcanic field as a whole. Different authors proposed that mafic rocks could be derived by partial melting of the mantle wedge (e.g., Luhr et al., 1989; Hawkeswoirth et al., 1991; Blatter and Hammersley 2010; Gómez-Tuena et al., 2018). Moreover, Losantos et al. (2017) proposed that low degrees of melting can produce small volumes of alkaline melts from alkaline-enriched portions of the mantle wedge. Luhr et al. (1989) proposed that alkaline magmas were formed during melting events that incorporated components from hydrous metasomatic veins rich in phlogopite, which are formed above the subduction slab. Thus, Lassiter and Luhr (2001), with Os isotopic information, proposed that variable inputs of slab-derived fluids or melts of less evolved magmas display higher 187Os/188Os ratios. These authors also suggested that a heterogeneous mantle might have been involved in the generation of magmas in this zone of Mexico.
Although we used bivariate diagrams of immobile trace elements ratios to investigate the source of this mafic magmatic group, the short number of analyzed rocks makes it difficult to suggest the origin of all mafic rocks along the MGVF and determine what type of processes affect their final composition. Despite the lack of a robust dataset, we suggest that the few sub-alkaline mafic rocks might have an N-MORB mantle source that produced magmas that were modified by variable amounts of assimilation of continental crust, which added Nb, Ta, and Th (Figure 6). The same is suggested by REE, where the continental crust additions may have depleted the HREE with respect to more alkaline mafic rocks (Figure 4). Although the alkaline mafic rocks are more closely related with OIB-type values within the mantle array (Figure 6), they are probably mixed with typical sub-alkaline melts (depleting their Nb–Ta and Th values). Isotopic interpretations shows the same problem about sample representativeness; however, it is clear that the alkaline rocks are more radiogenic in Sr and Pb isotopes, which is in accordance to data from alkaline environments (Figure 5).
FIGURE 6. (A) (Th/Yb) vs. (Nb/Yb) diagram for the volcanic rocks from the MGVF. (B) (Ta/Yb) vs. (Nb/Yb) diagram for the volcanic rocks from the MGVF. (C) (Nb/Ta) vs. (Th/Yb) diagram for volcanic rocks from the MGVF. (D) (Hf/Sm)N vs. (Ta/La)N diagram, melt, and fluid-related subduction metasomatism areas are from La Fléche et al. (1998). Abbreviations: OIB, ocean island basalt; E-MORB, enriched mid-ocean ridge basalt; N-MORB, normal mid-ocean ridge basalt; LCC, lower continental crust; MCC, middle continental crust; UCC, upper continental crust; PM, primitive mantle; and DM, depleted mantle. Continental crust values are taken from Rudnick and Gao (2003). Mantle values are taken from McDonough and Sun (1995).
We also investigated the effects of variable degrees of partial melting and/or fractional crystallization with bivariate diagrams of immobile trace elements ratios (Figure 7). These diagrams point to variable degrees of partial melting rather than fractional crystallization effects (Figure 7). In addition, we noted that the alkaline rocks show a wider range of REE ratios; we suggest that rather than higher degrees of partial melting, this variability reflects variable, and perhaps frequent, mixing events with typical sub-alkaline magmas.
FIGURE 7. (A–D) Immobile trace element ratio diagram illustrating the partial melting and fractionation effects in the MGVF volcanic rocks.
For a better understanding of the processes that control the genesis of the mafic group, a quantitative analysis was performed following the modeling approach of Zou (2007). This model uses batch partial melting equations to represent the origin of partial melting that dominates in the mafic magmatic group. Due to the scarcity of mantle xenoliths from the study area, we used REE concentration of garnet- and spinel-bearing lherzolite values proposed by Frey (1980) and McDonough (1990), respectively, as initial magma (C0). Mineralogical compositions used for spinel-bearing lherzolite melting are based on those proposed by Pearson et al. (2014) and Aguirre-Espinosa et al. (2022): 0.66 Ol + 0.24 Opx + 0.08 Cpx + 0.02 Sp and 0.63 Ol + 0.30 Opx +0.02 Cpx +0.05 Gt, for garnet-bearing lherzolite melt. Partition coefficients considered for both models were taken from McKenzie and O’Nions (1991). Partial melting models were used for melting degrees of 1–50% (F = 0.01–0.2). Partial melt models (Figure 8) reveal that rocks from the mafic group plot similar REE trends to spinel-bearing lherzolite partial melts (∼1–15%), suggesting that these rocks were generated through melting of a spinel-bearing lherzolite mantle source (Figure 8A). Alkaline rocks show similarities with the sub-alkaline rocks and are consistent with low degrees of partial melting in a spinel-bearing lherzolite. Moreover, the composition of some alkaline rocks suggests even higher degrees of partial melting than sub-alkaline rocks; an ongoing research in our group is investigating if this difference could be attributed to more interaction with the upper crust.
FIGURE 8. (A) Chondrite-normalized partial melt model for mafic magmas from the MGVF showing partial melting curves of spinel-bearing lherzolite melt. (B) Chondrite-normalized partial melt model for mafic magmas from the MGVF displaying partial melting curves of garnet-bearing lherzolite melt. Partial melt curves were generated at the degree of melting F = 0.01–0.2, applying batch melting equations reported by Zou (2007). More details are given in the text. The chondrite and primitive mantle values from normalization are taken from McDonough and Sun (1995). (C) (Zr) vs. (Rb/Hf) bivariate diagram showing partial melt model for mafic magmas from the MGVF. The melting curves are generated at the same degrees of melting F = 0.01–0.2. The mineralogical compositions are reported in orange for the spinel-bearing lherzolite curve and green for garnet lherzolite curve. (D) (Zr) vs. (Sm/Yb) bivariate diagram showing partial melt model for mafic magmas from the MGVF. Conditions of the model are reported in text.
These ranges of partial melting are also observed in incompatible trace element ratio models (Figures 8C,D), which suggest that mafic magmas were derived by 5%–15% of partial melting in a spinel-bearing lherzolite. These percentages of melting can be compared with those proposed by Rasoazanamparany et al. (2016), where they mentioned that high-MgO magmas (MgO = >8%; such as most of mafic magmas from the MGVF; Supplementary Table S4) can be generated by ∼ 15% partial melting of sediment and hydrous fluid derived from the oceanic crust. As well, these results are comparable and support the approach of the petrogenesis of mafic magmas of the MGVF proposed by Hasenaka and Carmichael, 1987, Luhr et al. (1989), and Gómez-Tuena et al. (2018).
Although a spinel peridotite’s origin confirms previous thoughts about the origin of magmas in the MGVF, the occurrence of alkaline rocks and the concentration of mafic rocks at the central portion of the volcanic field are mainly unexplored issues. An ongoing study is investigating the origin of alkaline rocks in the MGVF with detailed bulk and mineral chemistry; however, it seems that the occurrence of mafic rocks within the volcanic field can be explained with petrogenetic and tectonomagmatic relations.
The spatial distribution of these mafic rocks is mainly located in the central portion of the volcanic field (19°–20° latitude along the longitude 100°–103°; Figure 1B). It has to be noticed that mafic rocks distribution is based in published data that is available until the generation of the present work; hence, the sampling of these rocks is probably biased. Nevertheless, according to Avellán et al. (2020) and Menella et al. (2022), this area is tectonically controlled by the Tarímbaro graben which takes part as one of the 10 fault segments from the Morelia–Acambay Fault system (MAFS; Avellán et al., 2020). The Tarímbaro graben is located to the north of the MAFS and consists of dextral strike-slip faults that affect the NE part of the MGVF, especially at the city of Morelia, producing related normal faults (Figure 1B). (Avellán et al., 2020). The Tarímbaro graben system, compared to other extension areas of the MGVF (e.g., Suter 2016; Avellán et al., 2020), has been proposed to have deeper faults, which affect the whole crust (Avellán et al., 2020; Menella et al., 2022). In addition, mafic volcanism appears in the western segment of Tarímbaro graben. It coincides with the area with highest rate of extension from the region, according to the state of recent deformation through a structural analysis and the regional stress regime from focal mechanisms (Menella et al., 2022). This structural and stress setting together with the low grades of partial melting of spinel-bearing lherzolite is described in Figure 8, which suggest that the origin of these mafic rocks can be the result of a rapid ascent of magmas from the mantle. This rapid ascent can be related with the trend of OIB compositions in immobile trace element (Figure 6) where it marks a primitive source and the flat pattern in chondrite-normalized REE and multielement diagram trends (Figure 4), indicating that these rocks could be derived from subcontinental lithospheric mantle. Thus, it highlights the critical role of local structural settings in controlling the magma ascents and their compositions. Therefore, we consider the generation and rapid ascent of mafic magmas in the MGVF could not be limited only to the Tarímbaro graben, taking into account the potential lack of available data on mafic rock distributions across the volcanic field. Future studies need to focus on the identification and characterization of mafic rocks on the MGVF.
5.2 Origin of the intermediate magmatism
The intermediate volcanic rocks of the MGVF are dispersed within the 19°68′ to 20°05′ latitude along the longitude 100°27′ to 103°40′ (Figure 1B). Several authors have proposed different origin and evolution processes for the intermediate magmas of the MGVF (e.g., Luhr et al., 1989; Verma and Hasenaka, 2004; Gómez-Vasconcelos et al., 2015; Chevrel et al., 2016; Lossantos et al., 2017). Verma and Hasenaka (2004) proposed that intermediate magmas were formed by a heterogeneous mantle source, likely a veined mantle, and fractional crystallization. On the other hand, Losantos et al. (2017) mentioned that this type of rocks is derived from low degrees of crystallization and contamination with heterogeneous granitic components that involves distinct paragenetic assemblages. In addition, neglecting both mechanisms, Ownby et al. (2011) suggested that andesites within the Tancitaro area are formed by partial melting of hornblende-rich gabronorites.
In addition to the processes accounted for the MGVF, orogenic andesites worldwide have been reported as a product of high-pressure fractionation from a primary hydrous basaltic magma (e.g., Sisson and Grove, 1993; Ownby et al., 2007) or fractionation of olivine and clinopyroxene (low-Mg intermediate rocks; e.g., Smith, 2013). Also, it has been proposed that orogenic andesites can be produced by magma mixing with or without crustal contamination (e.g., Rollinson, 1993; Reubi and Blundy, 2009; Kent et al., 2010; Straub et al., 2011; Gómez-Tuena et al., 2014).
In order to contribute with the knowledge of the genesis of the intermediate magmas from the MGVF, we used a robust dataset formed by published data (n = 407; Supplementary Table S4). We sub-divided all the intermediate rocks into a low-Mg and a high-Mg series and modeled a series of immobile trace elements (Figure 7). According to these models, high-Mg intermediate rocks can be explained with variable degrees of partial melting. We recognized the same could be modeled for the sub-alkaline mafic rocks; thus, in addition to the primary partial melting, another process such as mixing or assimilation must be overprinted (e.g., Losantos et al., 2017). In contrast, low-Mg intermediate rocks are less variable and fall in a constrained compositional range, although aspects of their composition suggest that fractional crystallization dominates their composition (Figure 7). In any case, it seems that such differences are controlled either by heterogeneities in the source rocks or fractionation of different mineral assemblages at variable depths.
Thus, given the different intermediate rock series that occur in the volcanic field (low-Mg and high-Mg), we explored the processes that controlled the final composition of intermediate magmas from the MGVF.
We evaluated first the impact of fractional crystallization. Low-Mg rocks show constant Mg# for variable SiO2 contents (Figure 9); although high-Mg rocks apparently increase their overall Mg# with SiO2 increments (Figure 9), the MgO vs. SiO2 relation is inverse (Figure 9); hence, Mg# could be evaluated to be constant with SiO2 increment. In order to maintain a constant Mg#, MgO should decrease by fractional crystallization and Fe+2 should have subtle decrease. It is well known that crystallization of hydrous basalts stabilizes olivine over pyroxene and that magnetite is a stable phase (e.g., Sisson, 2015); these processes could account for the dominant depletion of MgO over Fe+2 required to produce the trends observed in Figure 9.
FIGURE 9. (A–F) Bivariate diagrams of major and trace elements for low-Mg and high-Mg intermediate volcanic rocks from the MGVF. The low-Mg intermediate magmas display constant #Mg for variable SiO2 contents that can suggest crystallization effects. The high Ni contents in high-Mg intermediate magmas suggest mantle heterogeneities below the MGVF with distinct metasomatized mantle areas.
It is well recognized that low-Mg intermediate magmas could be partial melts of olivine peridotites further modified in arc crust environments (Straub et al., 2014). Although high-Mg intermediate magmas should experience the same physical and thermal barriers as low-Mg magmas during their migration to the surface, their high Ni contents are characteristic; Straub et al. (2014) suggested that this type of rocks were produced by partial melting of pyroxenites, previously formed by mantle peridotites modified by silicic slab components. Figure 9 shows the contrast in Ni content of the intermediate magmas for the MGVF; high-Mg rocks show variable Ni contents and definitely are more enriched in Ni than low-Mg rocks. This reflects mantle heterogeneities below the MGVF with discrete zones of metasomatized mantle. Where and when these magmas reach the surface might depend on the time and space variations of the stress field, similar to the mafic magmas that erupted along the volcanic field. Figure 9 show the Sr–Zr content of low-Mg rocks and high-Mg rocks; both series contain similar concentrations, except for high-Mg rocks which show a low Sr–Zr group of samples. Furthermore, the Ba/Nb vs. Nb diagram from Figure 9F shows that low-Mg and high-Mg intermediate rocks have lower abundances of incompatible trace elements, which could require a more trace element depleted source and/or higher degrees of melting; therefore, it can be suggested that these rocks must be derived from a compositionally different lherzolite or mafic source which can be differentiated by a less enriched lherzolite source or by HFSE-rich basalts (e.g., Wanke et al., 2019). The slight enrichments in LREE and LILE over HREE and HFSE (Figures 7C,D) could argument a subduction component in intermediate rocks genesis (e.g., Wanke et al., 2019b).
As suggested in Sosa-Ceballos et al. (2021), the stress field might play an important role during the assimilation and fractional crystallization processes that modified the composition of intermediate and felsic magmas in the MGVF. We investigated what type of rocks might modify mafic magmas to produce more evolved rocks. The models comprise three low-crust xenoliths, one from San Luis Potosí (sample LP89 reported by Schaaf et al., 1994) and two found in volcanic rocks from the northern portion of the MGVF (sample JOR0712 reported by Rasoazanamparany et al., 2016 and the VS.1 sample reported by Ortega-Gutiérrez et al., 2014), granites from the Michoacán local basement and alkaline to sub-alkaline volcanic rocks (HM90 sample reported by Lapierre et al., 1992). Binary models show that the compositional variability of the intermediate rocks cannot be attained mixing the low-crust and either, alkaline or sub-alkaline magmas (Supplementary Figure S1). Although mixing, or assimilation, of the lower crust does not domain the evolution of the magmas, some fractional crystallization might occurred at lower-crust depth and contribute to the magma evolution. If the low crust is not dominantly involved, we investigated if the upper crust is relatively more integrated in the composition of the intermediate rocks.
We generated a series of AFC models to evaluate this process (Figure 10); we evaluated separately the low- and high-Mg series. These models were generated according to the equation described by De Paolo (1981) using trace element composition of the alkaline basic samples from MGVF (HM90; concentration reported by Lapierre et al., 1992), as initial magma (C0), and a granitic composition from the MGVF (JOR0712; concentration reported by Rasoazanamparany et al., 2016) as assimilated wall rock (CA). The mineral arrangement of 0.35 Opx + 0.25 Cpx + 0.1 Ap + 0.3 Plg was considered for a fractional crystallization process based on those proposed by Aguirre-Espinosa et al. (2022) for Sierra de Chichinautzin intermediate volcanic rocks. Partition coefficients were taken from Ersoy and Helvaci (2010). Fractional values of the remaining magma were of 0–0.09, and the ratio of assimilation to fractional crystallization was r = 0.01, r = 0.1, and r = 0.5.
FIGURE 10. (A,B) Bivariate assimilation-fractional crystallization model for intermediate magmas from the MGVF. The intermediate magmas display high ratios of fractional crystallization and low ranges of assimilation between mafic melt (HM90) and granitic component (JOR0712; r ∼ =0.001–0.1). (C) Sr–Nd isotope assimilation and fractional crystallization model for intermediate magmas from the MGVF, which display ratios of assimilation between r = 0.1 and r = 0.3. The LHG samples were taken from Luhr and Carmichael, (1985b); Luhr, (1997).
The most striking result is how rocks from the high-Mg series can be explained with variable rates of assimilation and fractional crystallization using an alkaline basalt and La Huacana Granite as end-members (Figure 10), whereas rocks from the low-Mg series are completely unrelated to the model (Figures 10A,B). The mixing between the upper crust and most likely some alkaline basalt could be suggested with the binary diagrams shown in Figure 11.
FIGURE 11. (A–C) Bivariate diagrams of SiO2 vs. trace elements for low-Mg and high-Mg intermediate volcanic rocks from the MGVF. The black line represent mixing curve between granitic end-members. The blue line display mixing curves between alkaline and sub-alkaline with a granitic end-members. Given the overall compositions of mafic rocks, one or multiple mafic melts could be involved. The granitic samples (JOR0712 and VS.1) show a relatively similar trend to intermediate volcanic rocks, suggesting low degrees of assimilation. The low-Mg intermediate rocks display an increase with SiO2 increments such in Sr and Ba, which suggests fractional crystallization, whereas that in Zr vs. SiO2 diagram displays a decrease with spread trend with SiO2 increments. The high-Mg intermediate rocks show a from constant to increase in trace element with the SiO2 increments, which suggests that fractional crystallization was not dominant; hence, a crustal assimilation could be occurred.
A complementary model was developed in base of Sr-Nd isotopic composition (Figure 10C). This model was constructed following the same mineral arrangement and partition coefficient of bivariate trace element model, but a different assimilated wall rock have been considered (LHG sample taken from Luhr and Carmichael, 1985b; Luhr 1997) due the scare of isotopic information of the sample used in trace element models. Such as in the AFC bivariate trace element model, the isotopic composition model suggest that intermediate magmas were generated through the fractional crystallization of a mafic parental magma and was contaminated by a granitic crust at low rates of fractional crystallization–assimilation (r = ∼ 0.1–0.3).
As already stated for felsic rocks (e.g., Sosa-Ceballos et al., 2021), tectonic stresses might define the evolution and final composition of intermediate rocks. We suggest that high-silica intermediate rocks represent magmas that were trapped in compressional zones and hosted by granites for longer periods of time, whereas low-silica intermediate rocks represent magmas more easily tapped to the surface. Because both type of rocks commonly contain quartz xenocrysts (e.g., Suhardja et al., 2015; Osorio-Ocampo et al., 2018; Pérez-Osorio et al., 2018; Ramírez and Uribe, 2019; Reyes-Guzmán et al., 2021), to investigate which type of intermediate rock (low-Mg and high-Mg) contain greater contents of quartz and relate their abundance to their relative residence time in the upper crust is a pending task.
Even the AFC models suggest that the high-Mg intermediate rocks are influenced by the assimilation of granites, we recognize the models are subjugated to uncertainties derived from the distribution coefficients of the chosen elements, the chosen mineral assemblages and the fact that the only driving force accounted is the latent heat of crystallization (underestimating heating processes by other magmas). Hence, which other processes could account for magma intermediate compositions? We previously suggested that more mafic rocks in the MGVF reflect mantle heterogeneities. In addition, the intermediate rocks are consistent, at least partially, with a flux melting model, in which the addition of volatiles encourages higher extents of melting and the development of wet magmas with higher LILE/HFSE ratios (Diaz-Bravo et al., 2014). This flux model is mainly based in the hypothesis that hydrous slab contributions are usually small, and consequently unable to exert a significant petrologic transformation of the mantle wedge below arcs (Díaz-Bravo et al., 2014). However, Grove et al. (2012) have mentioned that water and other volatiles play an important role in the melting behavior of peridotite at subduction zones, and that water is not the only component being transferred to the mantle wedge at convergent margins (e.g., Díaz-Bravo et al., 2014). As diverse authors have proposed (e.g. Gómez-Tuena et al., 2007; CooperRuscitto et al., 2012; Díaz-Bravo et al., 2014), melts from recycled sediments, subducted basalts and eroded crust can contribute significant amounts of silica to the mantle, and this can act as an effective metasomatic agent than solute-poor hydrous fluids, as well, if contribution of recycled silica is significant, the source of arc magmas will no longer be peridotitic, and the melting products will gradually become more intermediate.
Overall, intermediate rocks from the MGVF show variable Pb and Zr contents for a given SiO2 value (Supplementary Figure S2); at first glance this suggests that slab fluids were involved in the process and that heterogeneous domains of the mantle wedge were melted to produce the chemical diversity of the rocks observed. But as shown before, the presence of xenocrysts and the tectonomagmatic relations of felsic and intermediate rocks in the MGVF suggest that the integrated composition of intermediate rocks reflect a diversity of processes, very difficult to quantify.
Hence, we cannot neglect the fact that magmas arrived to the upper crust partially evolved or already formed as andesitic melts by partial melting of the mantle (e.g., Ownby et al., 2011; Sisson, 2015). Moreover, given the low abundance of felsic rocks in the MGVF, we cannot neglect the possibility that intermediate rocks are a mixture of mafic and felsic magmas (e.g., Reubi and Blundy 2009). If felsic magmas are produced by partial melting of the local granites (e.g., Sosa-Ceballos et al., 2021) we do not know the rate at which these magmas are produced, thus, perhaps these felsic magmas mixed with more mafic melts and contributed to the generation of intermediate rocks.
6. Conclusion
To summarize our proposal for the generation of mafic and intermediate magmas in the MGVF, a schematic model has been developed (Figure 12). Based on geochemical models, we suggest that mafic magmas are generated through low partial melting grades (∼1–15%) of a spinel-bearing lherzolite source. These magmas can be the result of partial melting of a heterogeneous mantle and a rapid ascent from the asthenosphere that is related to the local extensional stress regime that affects the central portion of the MGVF.
FIGURE 12. Schematic model for the evolution of the mafic and intermediate magmas from the MGVF. (A) Mafic rocks were generated through partial melting of lherzolite sources and display a rapid ascent from the asthenosphere to the surface, which is related to local extensional stresses. (B) Assimilation and fractional crystallization (AFC) processes show an important role in final composition of high-Mg rocks (green patch). (C) Fractional crystallization and/or partial melting of heterogeneous sources (e.g., piroxenites) that contributed to low–high Mg content before intermediate melts arrived to the upper crust. (D) Mixing of mafic and felsic magmas in shallow levels of the continental crust; felsic magmas were produced by partial melting of the local basement (modified from Sosa-Ceballos et al., 2021).
On the other hand, intermediate magmas display a more complex petrogenetic story. The analyzed datasets suggest that intermediate rocks can be separated into low-Mg and high-Mg series. Low-Mg intermediate magmas display an obvious impact of fractional crystallization processes. However, the AFC models do not display an obvious control on the generation of low-Mg intermediate rocks; nevertheless, some fractional crystallization might occur along the crust. In addition, AFC models and bivariate trace element ratios suggest that intermediate rocks from the MGVF are affected by mantle heterogeneities that domain the mantle wedge and produce a diverse set of intermediate rocks. This study highlights the necessity to focus on future studies with a regional point of view for a better understanding of the geodynamic and tectonic role that may control the variability of rock composition across the volcanic field.
Author contributions
DT-S, GS-C, XB, and JM contributed to the conception and design of the present work. All authors have contributed to the manuscript revision, edition, and modification through several drafts, and all authors approved the submitted version.
Funding
This study was funded by the project CONACYT-FC2406.
Acknowledgments
DT-S acknowledges the National Council of Science and Technology (CONACYT), Mexico for a postdoctoral fellowship by the project CONACYT-FC2406 (JM) and DGAPA-UNAM.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors, and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/feart.2022.932588/full#supplementary-material
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Keywords: geochemistry, isotopes, partial melting, mixing process, Michoacán–Guanajuato, Mexico
Citation: Torres-Sánchez D, Sosa-Ceballos G, Bolós X and Macías JL (2022) Petrogenesis of mafic-intermediate magmatism of the Michoacán–Guanajuato volcanic field in Western Mexico. A geochemical review. Front. Earth Sci. 10:932588. doi: 10.3389/feart.2022.932588
Received: 30 April 2022; Accepted: 08 August 2022;
Published: 01 September 2022.
Edited by:
Hossein Azizi, University of Kurdistan, IranCopyright © 2022 Torres-Sánchez, Sosa-Ceballos, Bolós and Macías. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Darío Torres-Sánchez, dtorress@igeofisica.unam.mx