Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early Pleistocene
The Quaternary climate is characterized by a notable cooling and significant glacial-interglacial fluctuations driven by the influence of orbital-induced insolation and bipolar ice-volume variability. The Weihe Basin, located in the critical zone of the Asian monsoon region, accumulated thick fluvia...
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| Format: | Article |
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Editorial Department of Bulletin of Geological Science and Technology
2023-11-01
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| Series: | 地质科技通报 |
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| Online Access: | https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.tb20220111 |
| _version_ | 1797277577609478144 |
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| author | Ting Wang Hang Zhang Youbin Sun |
| author_facet | Ting Wang Hang Zhang Youbin Sun |
| author_sort | Ting Wang |
| collection | DOAJ |
| description | The Quaternary climate is characterized by a notable cooling and significant glacial-interglacial fluctuations driven by the influence of orbital-induced insolation and bipolar ice-volume variability. The Weihe Basin, located in the critical zone of the Asian monsoon region, accumulated thick fluvial-lacustrine deposition and aeolian deposition since the Cenozoic, which is a key placeto explore the environmental evolution during the Quaternary period. Objective The fluvial-lacustrine strata of the Sanmen Formation in the Weihe Basin are considered to be closely related to Palaeo-Sanmen Lake. However, the relationship among the stratigraphic age of the Sanmen Formation, the evolution of the palaeolake as well as the evolution of regional tectonics is still under much debated. Methods In this work, the magnetic susceptibility and grain size records from two sections (Yanyu and Wujiabu) in the southern margin of the Weihe Basin have been generated to investigate sedimentary evolution during the interval of 2.6-1.6 Ma. Results The mean grain size (MGS) and magnetic susceptibility (MS) of the Yanyu loess exhibit large-amplitude variations as proxies for the East Asian winter and summer monsoons. The MGS and MS variations in theWujiabu section show that lithology changes from lacustrine to aeolian facies occurred at 1.95 Ma in the southern margin of the Weihe Basin. In lacustrine environments, MGS is positively correlated with MS and is sensitive to fluctuations in lake level linked with monsoonal precipitation. Conclusion Overall, the climatic characteristics on the margin of the Weihe Basin during the early Pleistocene can be divided into two intervals: ① the lake level frequently fluctuated during 2.6-1.95 Ma, ② the lake shrank from 1.95 to 1.6 Ma. We suggest that the disappearance of Palaeo-Sanmen Lake was affected by the development and integration of the Yellow River. |
| first_indexed | 2024-03-07T15:50:26Z |
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| id | doaj.art-7d1776af487545118c3956280a208579 |
| institution | Directory Open Access Journal |
| issn | 2096-8523 |
| language | zho |
| last_indexed | 2024-03-07T15:50:26Z |
| publishDate | 2023-11-01 |
| publisher | Editorial Department of Bulletin of Geological Science and Technology |
| record_format | Article |
| series | 地质科技通报 |
| spelling | doaj.art-7d1776af487545118c3956280a2085792024-03-05T02:38:33ZzhoEditorial Department of Bulletin of Geological Science and Technology地质科技通报2096-85232023-11-014269510510.19509/j.cnki.dzkq.tb20220111dzkjtb-42-6-95Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early PleistoceneTing Wang0Hang Zhang1Youbin Sun2State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaState Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaState Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, ChinaThe Quaternary climate is characterized by a notable cooling and significant glacial-interglacial fluctuations driven by the influence of orbital-induced insolation and bipolar ice-volume variability. The Weihe Basin, located in the critical zone of the Asian monsoon region, accumulated thick fluvial-lacustrine deposition and aeolian deposition since the Cenozoic, which is a key placeto explore the environmental evolution during the Quaternary period. Objective The fluvial-lacustrine strata of the Sanmen Formation in the Weihe Basin are considered to be closely related to Palaeo-Sanmen Lake. However, the relationship among the stratigraphic age of the Sanmen Formation, the evolution of the palaeolake as well as the evolution of regional tectonics is still under much debated. Methods In this work, the magnetic susceptibility and grain size records from two sections (Yanyu and Wujiabu) in the southern margin of the Weihe Basin have been generated to investigate sedimentary evolution during the interval of 2.6-1.6 Ma. Results The mean grain size (MGS) and magnetic susceptibility (MS) of the Yanyu loess exhibit large-amplitude variations as proxies for the East Asian winter and summer monsoons. The MGS and MS variations in theWujiabu section show that lithology changes from lacustrine to aeolian facies occurred at 1.95 Ma in the southern margin of the Weihe Basin. In lacustrine environments, MGS is positively correlated with MS and is sensitive to fluctuations in lake level linked with monsoonal precipitation. Conclusion Overall, the climatic characteristics on the margin of the Weihe Basin during the early Pleistocene can be divided into two intervals: ① the lake level frequently fluctuated during 2.6-1.95 Ma, ② the lake shrank from 1.95 to 1.6 Ma. We suggest that the disappearance of Palaeo-Sanmen Lake was affected by the development and integration of the Yellow River.https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.tb20220111weihe basinearly pleistocenelacustrine depositionaeolian loesspalaeo-sanmen lake |
| spellingShingle | Ting Wang Hang Zhang Youbin Sun Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early Pleistocene 地质科技通报 weihe basin early pleistocene lacustrine deposition aeolian loess palaeo-sanmen lake |
| title | Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early Pleistocene |
| title_full | Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early Pleistocene |
| title_fullStr | Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early Pleistocene |
| title_full_unstemmed | Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early Pleistocene |
| title_short | Sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the Weihe Basin during the Early Pleistocene |
| title_sort | sedimentary evolution revealed by aeolian and lacustrine depositions in the southern margin of the weihe basin during the early pleistocene |
| topic | weihe basin early pleistocene lacustrine deposition aeolian loess palaeo-sanmen lake |
| url | https://dzkjqb.cug.edu.cn/en/article/doi/10.19509/j.cnki.dzkq.tb20220111 |
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