Xuefa Shi1,2*
Zhengquan Yao1,2*
Jianxing Liu1,2Shuqing Qiao1,2
Yanguang Liu1,2Xiaoyan Li1,2Xisheng Fang1,2Chaoxin Li1,2- 1Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao, China
- 2Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
Transgression and regression deposits from the shallow continental margin provide information on orbital-scale variations in sea level, climate change, and local tectonics. In this study, we conduct a high-resolution chronological and sedimentological analysis of a 125-m core (NHH01) drilled in the southern Yellow Sea. We developed a high-resolution age model at the orbital timescale over the last ∼1 Myr by the astronomical tuning of the sediment grain size. Sedimentological analysis and environmental proxies reveal that the study area is characterized by cyclic alternations of neritic and littoral/fluvial deposits controlled by glacial–interglacial sea-level changes. These results confirm the earlier assumption that sea-level fluctuations play a dominant role in the sedimentary architecture of the southern Yellow Sea. Moreover, only low-frequency sea-level fluctuations (∼100 kyr) were preserved in the NHH01 sequence; however, additional high-frequency (∼40 kyr) sea-level variations were also present in the sediments of the shallower Bohai Sea. Despite the large spatial difference, this finding implies that the sedimentary environment in the eastern marginal seas of China had been influenced by the sea level as a whole over the last 1 Myr. The comparison of the sedimentary environment with other cores from the Bohai Sea, Yellow Sea, and coastal region, as well as records from Indonesia and Japan, reveals that a consistent initiation of large-scale marine transgression occurred at ∼0.8–1 Ma. This phenomenon was likely caused by the long duration of glacio-eustatic high sea-level stands following the Middle Pleistocene transition, which is characterized by a shift in glacial cycles from 40 to 100 kyr.
Introduction
The marginal seas in the western Pacific are located in the transitional zone between Eurasia and the Pacific Ocean. The sedimentary environment in this region is sensitive to glacial–interglacial sea-level oscillations during the Quaternary (Shackleton et al., 1984). The fluctuations in sea level lead to cyclic occupation of marine water on land and reworking of sediments in the continental margin, which is critical to understand the role of sea level in the evolution of the sedimentary environment (Reeves et al., 2008; Ridente et al., 2008; Capozzi and Negri, 2009) and its associated biogeochemical cycles (Johnson et al., 1999).
The continental shelf of eastern China is generally flat and wide, and hence, even very small sea-level changes can shift the coastline significantly, thereby affecting coastal and shelf depositional environments, which are often characterized by transgression and regression cycles (Yi et al., 2012; Shi et al., 2016; Liu et al., 2018, 2020; Yao et al., 2020). Moreover, this cyclic exposure of land area is possibly linked to the monsoon climate in East Asia. It has been suggested that the strengthening of the East Asian summer monsoon since the last deglaciation was closely related to the expanded marine setting toward the land because of the rising sea level (Li et al., 2014). Therefore, studies on transgression and regression cycles in the continental shelf of eastern China are important to understand its potential effects on regional and global climate.
The evolutionary history of marine transgression in the continental shelf of eastern China, especially when a modern-like marine setting was initiated, is still unclear. Moreover, the mechanism driving such initiation remains controversial. Yi et al. (2016) revealed that the Bohai Sea was dominated by fluvial and lacustrine settings from the late Miocene to the early Pliocene and then flooded since the late Pleistocene. This change was attributed to the tectonic subsidence of Miaodao Island, which prevented seawater intrusion during the late Miocene and the early Pliocene (Yi et al., 2016). Paleomagnetic and sedimentary environment results of a 214-m core (BH08) from the Bohai Sea showed that marine and continental depositional cycles since ∼1 Ma were due to sea-level changes during the glacial–interglacial cycles (Yao et al., 2014; Shi et al., 2016). The sedimentary records from the northern East China Sea indicated that the subsidence of the Min–Zhe Uplift controlled seawater intrusion in the region since ∼2 Ma (Yi et al., 2014). A 300-m long borehole (CSDP-1) from the western Yellow Sea, with a basal age of ∼3.5 Ma (Liu J.X. et al., 2016), showed the occurrence of extensive transgression at ∼ 1 Ma. Before ∼1 Ma, this region was dominated by fluvial facies with sporadic marine deposits (Liu et al., 2018). Based on the clay mineral and Sr–Nd isotopic study of CSDP-1, Zhang et al. (2019) suggested that the tectonic subsidence of the Min–Zhe Uplift since the middle Pleistocene was the first-order control on large-scale transgression of the Yellow and Bohai seas. Gao et al. (2020) demonstrated that the widespread marine-related deposits on the coastal plain of the southern Yellow Sea were associated with the subsidence of the Min–Zhe Uplift at ∼0.8 Ma, which allowed the intrusion of seawater from the East China Sea to the southern Yellow Sea (Gao et al., 2020).
The Bohai Yellow seas have undergone similar environmental changes during the Quaternary, thereby providing an ideal background for studying the history of marine transgression and its underlying causes. In this study, we investigate a 125-m long core (NHH01) from the southern Yellow Sea to understand the sedimentary history over the last ∼1 Myr. Our results were then combined with the published results of core BH08 from the Bohai Sea to reveal the dominant control of sea level on the sedimentary environment at the tectonic–orbital timescale.
General Settings
The Yellow Sea is a semi-enclosed sea located between the Chinese mainland and the Korean Peninsula, covering an approximate area of 400,000 km2 and a mean water depth of 44 m (He, 2006). It connects with the Bohai Sea via the Bohai Strait in the north and the East China Sea in the south (Figure 1). The entire Yellow Sea is separated into two parts by the Shandong Peninsula: the northern Yellow Sea and the southern Yellow Sea. The water depth of the southern Yellow Sea displays a general increasing trend from the northwest to the southeast (Qin et al., 1989). The Yellow Sea is dominated by the semi-diurnal tides (M2) (tidal range 2–4 m), which is mostly 1–3 m high, occasionally exceeding 4 m during typhoons and storms (Fang, 1986). The circulation pattern in the Yellow Sea is characterized by the Yellow Sea Warm Current and coastal currents (Hu, 1984).
Figure 1. Location of the Bohai Sea, Yellow Sea, and of core NHH01 and other cores mentioned in the text.
The rivers surrounding the Yellow Sea supply a significant amount of sediment to this area, especially the Yangtze River and the Yellow River. Over 1.0 billion tons of sediments are transported by the Yellow River to the Bohai Sea annually (Milliman and Meade, 1983). Approximately 15–30% of the sediment is transported out of the Bohai Sea and into the Yellow Sea (Alexander et al., 1991; Qiao et al., 2017). Moreover, an average of 1 × 106 tons/yr of sediment from the Yangtze River was transported into the Yellow Sea by the Yellow Sea Warm Current (Gao et al., 1997). In comparison with the Yellow River, other small rivers drained from the Chinese mainland and the Korean Peninsula contribute less sediment load (Lee and Chough, 1989; Yang et al., 2003). A review examining the sediment budget in the Eastern China Shelf suggests that rivers around the Yellow Sea discharge ∼13.0 × 106 tons of sediment per year, of which ∼50% is assumed to form the subaerial delta (Qiao et al., 2017). It is suggested that the major source of fine-grained sediment deposited in the Yellow Sea is either transportation from the Bohai Sea or erosion from the surrounding coastal areas, and the atmospheric dust contributes only ∼ 1–2% of the mud deposits in the Yellow Sea (Qiao et al., 2017). Although the eolian dust input into the Yellow Sea would be higher during the glacial periods, it can be expected that its contribution was considerably less than the fluvial input and erosion from the surrounding area (Zhou et al., 2014; Qiao et al., 2017).
The southern Yellow Sea is a Mesozoic–Cenozoic graben basin and its basement is characterized by NE- and NEE-oriented uplift-and-subsidence zones formed as a result of tectonic movements since the Mesozoic (Gilder and Courtillot, 1997). The Min–Zhe Uplift extends northeastward from southeastern China (Guangdong, Zhejiang, and Fujian provinces) through Cheju Island to the southeastern Korean Peninsula. It was uplifted in the late Mesozoic and formed a boundary between the southern Yellow Sea and the East China Sea (Jin and Yu, 1982). The basement of the Min–Zhe Uplift is dominated by the Precambrian metamorphic rocks and the Mesozoic pyroclastic rocks, underlying the Cenozoic marine sediments with thickness ranging from 800–1200 m (Jin and Yu, 1982). The estimated thickness of Quaternary sediments was 300 m because of the continuous subsidence since the Miocene (Qin et al., 1989; Yang et al., 2004; He, 2006), which favors the preservation of sediments.
Material, Methods, and Data Sources
Core NHH01 (125.6 m, 123°13′E, 35°13′N; Figure 1) was recovered from the southern Yellow Sea at a water depth of ∼73 m. The approximate mean core recovery is 91%.
X-ray fluorescence (XRF) core scanning provides a non-destructive, rapid and nearly continuous analysis of elements in the sediment profile (Jansen et al., 1998). Elemental abundances in core NHH01 were obtained at ∼1-cm intervals using the Itrax XRF core scanner. The color reflectance of the sediments was measured at a resolution of ∼1 cm using a hand-held spectrometer. The parameter of a∗ in color reflectance is generally defined as redness, in which higher values correspond to more reddish sediments. Previous studies have indicated that the variations in a∗ are mainly linked to the presence of high-valence iron oxides and hydroxides (Deaton and Balsam, 1991), which are prone to be enriched (depleted) in relatively oxidizing (reducing) environments. Sediment redness can thus indicate paleo-redox conditions (Nagao and Nakashima, 1992). In previous study, benthic foraminiferal analyses were carried out for 96 samples in a previous study (Liu et al., 2014) to clarify the sedimentary environment.
Astronomical tuning method can provide a high-resolution chronology for sedimentary sequences at orbital timescales. However, such chronology can only be developed when the lithologies or proxies in the sedimentary sequence can be correlated to orbital-forcing climatic changes. Sediment texture, such as grain size in core NHH01, provides direct information on the sedimentary environment related to glacial-interglacial climate changes (Liu et al., 2014). Before tuning, spectral analysis was carried out on the grain size data (clay content) using the REDFIT method implemented in PAST software (Hammer et al., 2001). Bandpass filters were used to isolate the 100-kyr components of the clay time series using AnalySeries software (Paillard et al., 1996).
Results
Sedimentary Environment Recorded in Core NHH01
Lithological and microfossil data, including clay/sand content, sediment redness (a∗) and XRF scanning-derived Fe/Si ratio, show that core NHH01 is characterized by the alternations of neritic and littoral deposits throughout the sequence (Figure 2). Core NHH01 is mostly dominated by marine-related deposits, with three layers of fluvial deposits present at ∼35, 65, and ∼108–125 m in the core sequence (Figure 2). Therefore, the first appearance of marine transgression occurred at ∼108 m of the core, which marks the initiation of the marine transgression in the study area. The discrimination between the neritic and littoral deposits was obtained based on the microfossil assemblages. Generally, the abundance of foraminifera was relatively high in the neritic deposits relative to the littoral settings (Figures 2F,H). This pattern of cyclic neritic and littoral deposits is also evidenced by the grain size and geochemical data, exhibiting high clay content, higher Fe/Si and lower a∗ (less redness) values in the neritic deposits (Figure 2). This coherency can be reasonably explained in the case of shallow marine settings, as Fe is prone to be enriched in fine sediments, whereas Si is enriched in the coarse fraction (Lin et al., 2002; Liu S. et al., 2016). Lower a∗ values in the neritic deposits suggest more reducing conditions, due to deeper water depth and high clay content in sediments.
Figure 2. Sedimentary environment and proxies of core NHH01. Lithology (A; Liu et al., 2014), clay (B) and sand content (C; Liu et al., 2014), sediment redness (D; a*), XRF-scanning Fe/Si ratio (E), foraminifera abundance (F; FA, Liu et al., 2014), marine ostracods abundance (G), and fractions of shallow (H) and deep (I) water foraminifera.
Astronomically Calibrated Chronology of Core NHH01
The variations in the clay content of core NHH01 are closely linked to the sedimentary environment in the Yellow Sea, with high clay content in the neritic deposits and low values in the littoral deposits. Considering that the alternation of neritic and littoral deposits is related to the fluctuations in sea level, the proxy of the clay content in the NHH01 sequence can be used as a proxy to reflect sea-level fluctuations that are linked to glacial–interglacial climate changes. This relationship was also reported in a previous study, which suggested that more clay was found in the interglacial deposits (Liu et al., 2014).
Spectral analysis of the clay content in core NHH01 in the depth domain revealed two strong cycles centered at 28.7 and 9.6 m (Figure 3A). Using the initial chronology established by paleomagnetic results (Liu et al., 2014) which suggested a basal age of ∼1.1 Ma for the core, the cycles at 28.7 and 9.6 m correspond to the cycles at 253 and 84 kyr cycles, respectively. The calculated 84-kyr cycle is further supported by the spectral analysis of clay in the time domain, which shows a 78-kyr cycle (Figure 3B). As the cycle at 78–84 kyr is largely consistent with orbital eccentricity periods of 100 kyr, we suggest that the clay fraction in core NHH01 can be used for tuning the stratigraphic record. Thus, we used orbital eccentricity, which was calculated after the La2004 astronomical solution as a target curve (Laskar et al., 2004). We first filtered the 100-kyr signal from the clay content and correlated it with the eccentricity target curve (Figure 4B). The minimum in the filtered curve of clay, which corresponds to littoral sediments, has been correlated with minima in eccentricity (Figures 4A,B), which marks glacial sea-level lowstands. Similarly, eight additional control points were used to establish the chronology. This tuning results in an almost cycle-by-cycle correlation of the variations in clay with the marine δ18O record (Lisiecki and Raymo, 2005; Figures 4A,D). The mean sediment accumulation rate (SAR) was calculated based on the tunned age model at the orbital timescale. In general, the SAR was relatively high during most of the interglacial periods and was lower during the glacial periods (Figure 4C).
Figure 3. Spectral analyses of the clay fraction from core NHH01 in depth (A) and time (B) domain against the initial age model constrained by paleomagnetic results, with their 80% (red), 90% (purple), and 95% (blue) significance levels indicated with dashed lines.
Figure 4. Temporal variations in clay content (A), filtered 100-kyr signal (B; solid lines) and associated theoretical orbital eccentricity (red dashed line; Laskar et al., 2004), sediment accumulation rate (C; SAR) and comparison with marine δ18O record (D; Lisiecki and Raymo, 2005) with Marine Isotope Stage (MIS) at interglacials labeled along the curve. Vertical dashed lines represent the newly added age points. Bandpass filters with central frequency of 0.01 and bandwidth of 0.002 were used to isolate the 100-kyr components of the clay fraction using AnalySeries software (Paillard et al., 1996).
Discussion
Initiation and Implication of the Large-Scale Transgression in the Continental Shelf of Eastern China
The analysis of the sedimentary environment suggests that the study area was dominated by the alternating of neritic and littoral deposits during the last ∼1.05 Ma (Figure 2). The initiation of the marine transgression occurred at ∼ 1 Ma, which is largely consistent with the results from the Yellow Sea and Bohai seas (Figure 5). The comparison of sedimentary facies/environment of cores from the western Yellow Sea (CSDP-1; Liu et al., 2018), Bohai Sea (BH08; Yao et al., 2014; Shi et al., 2016) and Bohai coastal area (BH1, BH2, HLL02x, Lz908, and BZ2; Yao et al., 2010, 2012; Yi et al., 2015, 2016) reveals that the occurrence of large-scale marine-dominated deposits in this region initiated at ∼0.8–1 Ma, marking the formation of the modern-like sedimentary environment.
Figure 5. Comparison of lithostratigraphy and magnetostratigraphy of long sediment cores from the Bohai Sea, Yellow Sea, and coastal plain. Data for core BZ2 are from Yao et al. (2010, 2012), BH1, BH2, and HLL02 from Yi et al. (2016), Lz908 from Yi et al. (2015), NHH01 from Liu et al. (2014), CSDP-1 from Liu S. et al. (2016) and Liu et al. (2018). The GPTS is from Gradstein et al. (2012).
Regarding the cause of the initiation of the large-scale marine transgression, previous studies from the Bohai Sea, southern Yellow Sea, and East China Sea consistently revealed that large-scale marine transgression occurred at 0.8–1 Ma and was attributed to the subsidence of the Min–Zhe Uplift (Yi et al., 2014; Zhang et al., 2019; Gao et al., 2020). Before ∼0.8 Ma, the Min–Zhe Uplift was high enough to prevent seawater intrusion. Thereafter, the subsidence of the Min–Zhe Uplift facilitated the marine transgression into the Yellow Sea. However, we argue that the initiation of the large-scale marine transgression in the continental shelf of eastern China was not necessarily linked to the subsidence of the Min–Zhe Uplift, based on the following evidence. In core CSDP-1, the first appearance of marine deposits was found at ∼1.66 Ma (Liu et al., 2018), which was considerably earlier than ∼0.8–1.0 Ma. Moreover, no reliable evidence indicates the subsidence of the Min-Zhe Uplift at that time. Second, magnetostratigraphy and sedimentary environment studies from the Osaka Bay, southwestern Japan, suggest that the first seawater intrusion occurred during a period of high sea level that corresponded to the marine oxygen isotope stage 37 (∼1.2 Ma; Biswas et al., 1999; Kitaba et al., 2011). Paleomagnetic, diatom, and sedimentology analyses from Sangiran in central Java, Indonesia, revealed that the first major marine transgression occurred after the Olduvai event at ∼1.7 Ma, followed by the second one just before the Jaramillo event at ∼1.1 Ma (Yokoyama and Koizumi, 1989). These two marine transgressions can be correlated with those of the marine deposits in the Yellow Sea and the Osaka Bay. These findings suggest that the initiation of the large-scale marine transgression also occurred at ∼1 Ma in the entire western Pacific and was not related to the tectonic subsidence event of the Min–Zhe Uplift. Thus, we suggest that the glacio-eustatic sea level associated with the Middle Pleistocene transition (MPT) was responsible for the initiation of the marine transgression in the continental shelf of eastern China. The MPT is characterized by a transition of ice-age cyclicity from 41 to 100 kyr, as well as an increased amplitude of δ18O (Ruddiman et al., 1989) and decreased sea-level stands (Lambeck et al., 2002). The increased duration of high sea level under 100-kyr glacial cycles likely facilitated the inundation of more land area by the seawater during the interglacial periods, and eastern China had subsided since the Miocene (Qin et al., 1989; Yang et al., 2004).
The comparison of SAR in cores from the coastal and offshore areas suggests high SAR for offshore cores (BH08, CSDP-1, and NHH01) prior ∼0.78 Ma than for the last ∼0.78 Ma (Figure 6). This scenario is opposite for cores from the shallow coastal region that has higher SAR during the time interval of 0–0.78 Ma (Figure 6). These contrasting SAR patterns imply that the depositional locus across the MPT was likely shifted from the offshore to the coastal region owing to increased accommodation space caused by longer high sea-level periods under 100-kyr glacial cycles. This observation further highlights the significant control of the MPT-modulated sea level on the sedimentation of this region at the tectonic timescale.
Figure 6. Sedimentary accumulation rates (SAR) at the tectonic (A) and orbital (B) timescale for cores from the Bohai Sea, Yellow Sea, and coastal plain, and comparison with the global sea-level curve (C; Miller et al., 2005). Data for core BZ2 are from Yao et al. (2010, 2012), BH1, BH2, and HLL02 from Yi et al. (2016). Lz908 from Yi et al. (2015), NHH01 from Liu et al. (2014), CSDP-1 from Liu S. et al. (2016), Liu et al. (2018); BZ1 from Xiao et al. (2008), TJC-1 from Li et al. (2016) YRD-1101 from Liu et al. (2020), CH500 from Pei et al. (2016), Bg10 from Yuan et al. (2014), G2 from Xiao et al. (2014), G3 from Yang et al. (2020).
Sea-Level Controls of the Sedimentary Environment at Orbital Timescale
The climate during the Quaternary was marked by glacial and interglacial alternations (Shackleton et al., 1984), which led to significant sea-level fluctuations (Lambeck et al., 2002). In addition, regional and local tectonic activity might have influenced the sea-level changes (Miller et al., 2005). However, the potential influence of tectonics generally works at longer timescales (>107-year scale; Miller et al., 2005), and previous results from this region suggested that sea level plays a dominant role in controlling the changes in transgression and regression environmental change (Liu et al., 2014, 2018; Shi et al., 2016). According to the results of core NHH01, the study area was dominated by the alternation of the littoral and neritic deposits during the last ∼1 Ma (Figures 2, 7). Based on the tuning chronology, the neritic deposits corresponded to the highest sea-level stands during the interglacial periods, whereas the littoral deposits corresponded to the moderate sea-level stands. In the entire NHH01 sequence, we found that only three fluvial-related layers occurred during the MIS 10, MIS 18, and MIS 30 (Figure 7) when sea-level stands were low (Miller et al., 2005).
Figure 7. Sedimentary environment and proxies of core NHH01 from the Yellow Sea (this study) compared with proxy records of core BH08 from the Bohai Sea (Yao et al., 2020), and their comparison with the global sea-level curve (Miller et al., 2005). Clay content and its filtered 100-kyr signal (red line; A), sand content of core NHH01 (B), PC1 (31–500 μm) of core BH08, a proxy indicating the littoral deposits caused by sea-level change, and its filtered 100-kyr and 40-kyr signals (red line; C,D), sediment color c* (E; Shi et al., 2016) and global sea-level curve (F; Miller et al., 2005).
Sediment cores from the Bohai Sea (Qin et al., 1989; Yao et al., 2014; Shi et al., 2016; Li et al., 2019), Yellow Sea (Liu et al., 2014, 2018), and coastal regions (Yao et al., 2012; Yi et al., 2012, 2015) have revealed that the sedimentation in this region is characterized by the alternation of transgression and regression cycles, as a consequence of cyclic sea-level fluctuations. Our results are consistent with those of previous studies, suggesting that the climate-induced sea-level changes play a major role in controlling the sedimentary environment, which is also true for other continental margins worldwide (Amorosi and Milli, 2001; Gerdes et al., 2003; Aguzzi et al., 2007).
An interesting feature can be observed by comparing the core BH08 from the Bohai Sea with core NHH01 from the Yellow Sea. The component PC1 (31–500-μm fraction) in core BH08 (Yao et al., 2020), a proxy of littoral deposits, shows clear ∼100- and ∼40-kyr cycles, whereas only ∼100-kyr was found in the clay profile of NHH01 (Figure 7). We attribute this difference to the different water depths in these two areas, as large-amplitude sea-level fluctuations at ∼100 kyr band were preserved both in the deep Yellow Sea (∼73 m) and shallower Bohai Sea (∼25 m), whereas secondary sea-level fluctuations that dominated at ∼40 kyr were preserved only in the Bohai Sea. This inference further implies that the Bohai and the Yellow seas were strongly influenced by the glacial–interglacial sea-level changes as at least since ∼ 1 Ma.
Conclusion
Sedimentological and micropaleontology studies in the NHH01 sequence, along with sediment color, XRF-scanning elemental abundance data, and the tuned age model, shows the cycles of littoral and neritic deposits, which correspond to glacial–interglacial periods over the last 1 Ma. The comparison of core NHH01 with records of other cores from the Bohai Sea and the Yellow Sea suggests that the sea-level fluctuations played a dominant role in the sedimentary architecture of this region. Despite the spatial differences, low-frequency sea-level variations (∼100 kyr) were preserved in the Yellow Sea and high-frequency sea-level variations (∼40 kyr) in the shallow Bohai Sea, confirming the sea-level controls on the sediment accumulation pattern in eastern China since the last 1 Ma.
A comparison of the sedimentary environment in core NHH01 with records of other cores from the Bohai and Yellow seas revealed that the large-scale marine transgression was initiated in the region at ∼1 Ma ago. This timing is consistent with the sedimentary records from the Osaka Bay in Japan and central Java in Indonesia, thereby suggesting that the glacio-eustatic sea-level variations plays a major role in this large-scale transgression event in the western Pacific marginal region. Thus, we propose that the extensive marine transgression that occurred at ∼1 Ma was attributed to the long duration of high sea-level stands after the MPT.
Data Availability Statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Author Contributions
XS and ZY designed the study, synthesized, analyzed the data, and wrote the manuscript with contributions from all authors. JL, SQ, and YL analyzed the data related to the sedimentology. XL analyzed the data of microfossils. XF and CL help to collect the core sample. All authors contributed to the article and approved the submitted version.
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.
Acknowledgments
This work was jointly supported by the Basic Scientific Fund for National Public Research Institutes of China (2018S01), the NSFC-Shandong Joint Fund for Marine Science Research Centers (U1606401 and 41476055), the National Program on Global Change and Air-Sea Interaction (GASI-GEOGE-03), and the Taishan Scholar Program of Shandong (XS). We thank the Editor and two reviewers for their valuable suggestions and Selvaraj Kandasamy for language improvement.
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Keywords: Yellow Sea, sea level, astronomical tuning, marine transgression, orbital timescale
Citation: Shi X, Yao Z, Liu J, Qiao S, Liu Y, Li X, Fang X and Li C (2021) Dominant Role of Sea Level on the Sedimentary Environmental Evolution in the Bohai and Yellow Seas Over the Last 1 Million Years. Front. Earth Sci. 9:638221. doi: 10.3389/feart.2021.638221
Received: 05 December 2020; Accepted: 17 March 2021;
Published: 12 April 2021.
Edited by:
David K. Wright, University of Oslo, NorwayReviewed by:
Li Wu, Anhui Normal University, ChinaDhananjay Anant Sant, Maharaja Sayajirao University of Baroda, India
Copyright © 2021 Shi, Yao, Liu, Qiao, Liu, Li, Fang and Li. 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: Xuefa Shi, eGZzaGlAZmlvLm9yZy5jbg==; Zhengquan Yao, eWFvenFAZmlvLm9yZy5jbg==