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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Economic Geology
Volume 12 - 2024 | doi: 10.3389/feart.2024.1437599
This article is part of the Research Topic Exploration, Development, and Protection of Earth’s Resources and Environment: Methods, Techniques, Applications, Prospects, Insights, and Problems View all 14 articles

Genesis of Permian granitoids in the southeast of Inner Mongolia and their response to the Xing'an-Mongolia Orogenic Belt evolution: Constraints from zircon U-Pb age, geochemistry and Hf isotopes

Provisionally accepted
Xue Xiaogang Xue Xiaogang 1Peng Zhang Peng Zhang 2*Guoqiang Chen Guoqiang Chen 1Haihong Zhang Haihong Zhang 1Xuebin Zhang Xuebin Zhang 3
  • 1 School of Prospecting and Surveying Engineering, Changchun Institute of Technology, Changchun, China
  • 2 Shenyang Center of China Geological Survey, Shenyang, China
  • 3 Tianjin Geological Survey Institute, Tianjin, China

The final, formatted version of the article will be published soon.

    Research on the geological process of the Xing'an - Mongolia Orogenic Belt, has attracted the attention of scholars both domestically and internationally, and the genesis of granite formed during this process is one of the contents that reveals this process. This article focuses on the development of Permian granitic complex in Jielin Ranch, and conducts systematic geological, petrographic, zircon U-Pb chronology, Hf isotope, and geochemical tracing of rock elements for evidence. The result shows: the granitic complex is a complex rock mass, mainly composed of monzogranite and syenogranite; which obtained zircon U-Pb ages of 291.1 ± 1.1 Ma and 260.8 ± 1.1 Ma, respectively. They are all acidic and aluminum rich rocks, and the monzogranite is a potassium rich, high potassium calcium alkaline rock series with relatively low REE content, high degree of fractionation, and insignificant europium anomalies, enriched with LILE (Rb, Th, U, K), deficient elements such as Ba, Sr, Nb, Ti, P, εHf(t) values are from+4.1 to+7.0 (TDM2=1130 ~ 920 Ma). Indicating that it is an I-type granite with high differentiation, formed in a volcanic arc environment, and the magma originated from partial melting of the lower crust in the Middle Neoproterozoic. The syenogranite is a potassium high potassium transitional rock series with a high rare earth content (214 × 10-6 ~ 325 × 10-6), low LREE/HREE (2.54 ~ 6.41), δEu (0.04 ~ 0.15) and the typical "four component effect" fractionation mode is enriched in large ion lithophilic elements such as Rb, Th, K, and strongly depleted in elements such as Ba, Sr, Nb, Ta, Ti, P, εHf(t) values are from +4.2 to +8.6（TDM2=738 ~ 1228 Ma）, indicating the geochemical characteristics of "A2 type" granite. The magma originated from partial melting of the lower crust of the Middle and Neoproterozoic with the participation of mantle derived melts, and was formed during collision extension transformation. This conclusion indicates that the study area experienced a continental margin arc in the early Permian and a brief backarc extension process in the late Permian; This achievement can provide new data for the study of the evolution process of the Xing’an-Mongolia Orogenic Process.

    Keywords: Jielin Ranch in eastern Inner Mongolia, Permian granitic complex, Zircon U-Pb dating, Hf isotopes, Petrogenesis, The Xing'an-Mongolia Orogenic Process

    Received: 24 May 2024; Accepted: 12 Aug 2024.

    Copyright: © 2024 Xiaogang, Zhang, Chen, Zhang and Zhang. 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) or licensor 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: Peng Zhang, Shenyang Center of China Geological Survey, Shenyang, China

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