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Long-term drying trend during 51.8-37.5 Ma in the Nangqian Basin, central-eastern Qinghai-Tibet Plateau

文献类型：期刊论文

作者Li, Shangkun1,2; Ma, Xueyun1; Jiang, Shaohua3; Wang, Gen1; Zhang, Ting1; He, Wei1; Yu, Xiaoli1,2; Ma, He2,4; Zhang, Pengyuan2,4; Wei, Jingyi2,4
刊名FRONTIERS IN EARTH SCIENCE
出版日期2022-09-13
卷号10页码:17
关键词biomarkers paleoclimate paleovegetation Nangqian Basin Qinghai-Tibet Plateau
DOI10.3389/feart.2022.866304
英文摘要Since the Cenozoic, the earth entered a period of relatively active tectonic movement, which led to significant environmental and climatic shifts, including inland drought in Asia, global cooling, and the formation of the Asian monsoon. The Asian aridification has a far-reaching impact on the human living environment, and so do the climate changes in China. The beginning, strengthening, and ending times of the inland drought in Asia have been a long-concerned issue. Therefore, it is necessary to reveal the starting time, evolution process, and underlying driving mechanisms. Because of its unique topography and geographical location, the Qinghai-Tibet Plateau is known as the "starter " and "amplifier " of global climate change. It is a key area and an ideal "laboratory " for long-time scale climate change. Located in the central-eastern part of the Qinghai-Tibet Plateau, the Nangqian Basin is not only the confluence area of major monsoons and westerly winds but also the boundary between humid and arid areas. Moreover, the Nangqian section in the basin has a long continuous sedimentary sequence, making it a good carrier for long-time scale climate change research. In this study, biomarkers and total organic carbon (TOC) in the sedimentary strata of the Nangqian Basin in the central-eastern Qinghai-Tibet Plateau were used to reconstruct the paleoclimate and paleovegetation evolution history over the time interval of 51.8-37.5 Ma. According to the climatic index of the Nangqian Basin, the climate evolution history can be divided into three stages. StageI: during 51.8-46.4 Ma, the depositional environments at this stage were mainly a braided river and an ephemeral shallow pond/lake environment. Also, the value of CPI, delta C-13( n-alkanes), and total organic carbon (TOC) was low; meanwhile, ACL value increased with nC(27)/nC(31) decrease, and these obvious change trends might be affected by the mixing of terrestrial sediments brought by rivers. The main peak carbons were nC(22) and nC(23), the vegetation type was predominantly woody plants, and the climate was relatively humid. Stage II: during 46.4-42.7 Ma, Paq and nC(27)/nC(31) values decreased gradually, and ACL, delta C-13( n-alkanes,) and CPI values increased slowly. Also, the main peak carbon number changed from low to high, and the vegetation type varied from woody to herbaceous. All these proxies displayed that the climate became more arid. Stage III: during 42.7-37.5 Ma, Paq, ACL, and nC(27)/nC(31) values did not vary too much, delta C-13( n-alkanes) values increased slightly, and ACL values decreased slightly, while the main peak carbon number, TOC, and CPI increased significantly, indicating that the climatic conditions continued to get dryer, which may have been affected by the MECO events. In addition, through the comparative study of the climate evolution history of the Eocene in the Nangqian Basin reconstructed by the multi-index system, together with the climate change in the adjacent area, the retreat process of the Paratethys Sea, the global deep-sea oxygen isotopes, and the global atmospheric CO2 concentration, it is considered that the Eocene climate change in the Nangqian Basin is mainly affected by the global climate change and the retreat of the Paratethys Sea. the global deep-sea oxygen isotopes, and the global atmospheric CO2 concentration, it is considered that the Eocene climate change in the Nangqian Basin is mainly affected by the global climate change and the retreat of the Paratethys Sea. The uplift of the Qinghai-Tibet Plateau and the increase of altitude have little influence on the water vapor of the Nangqian Basin, and the basin was rarely affected by the South Asian monsoon.
WOS关键词ASIAN MONSOONS ; N-ALKANES ; ENVIRONMENTAL IMPLICATIONS ; GENERAL-CIRCULATION ; EURASIAN CLIMATE ; SUBTROPICAL JET ; LAKE-SEDIMENTS ; LUNPOLA BASIN ; SOUTHERN ASIA ; TARIM BASIN
资助项目Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program[2019QZKK0707] ; National Key R&D Program of China[2017YFA0604803] ; Chinese Academy of Sciences Key Project[XDB26020302] ; National Natural Science Foundation of China[41831176] ; National Natural Science Foundation of China[41902028] ; National Natural Science Foundation of China[41972030] ; CAS "Light of West China" Program[1309RTSA041] ; Key Laboratory Project of Gansu[1309RTSA041]
WOS研究方向Geology
语种英语
WOS记录号WOS:000861273000001
出版者FRONTIERS MEDIA SA
资助机构Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences Key Project ; Chinese Academy of Sciences Key Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Key Laboratory Project of Gansu ; Key Laboratory Project of Gansu ; Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences Key Project ; Chinese Academy of Sciences Key Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Key Laboratory Project of Gansu ; Key Laboratory Project of Gansu ; Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences Key Project ; Chinese Academy of Sciences Key Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Key Laboratory Project of Gansu ; Key Laboratory Project of Gansu ; Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; Second Qinghai-Tibet Plateau Scientific Expedition and Research (STEP) Program ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences Key Project ; Chinese Academy of Sciences Key Project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS "Light of West China" Program ; CAS "Light of West China" Program ; Key Laboratory Project of Gansu ; Key Laboratory Project of Gansu
源URL[http://ir.iggcas.ac.cn/handle/132A11/108330]  
专题地质与地球物理研究所_兰州油气中心
地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Wei, Zhifu
作者单位1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources Res, Lanzhou, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Weifang Vocat Coll, Weifang, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, CAS Ctr Excellence Life & Paleoenvironm, Key Lab Cenozo Geol & Environm, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Li, Shangkun,Ma, Xueyun,Jiang, Shaohua,et al. Long-term drying trend during 51.8-37.5 Ma in the Nangqian Basin, central-eastern Qinghai-Tibet Plateau[J]. FRONTIERS IN EARTH SCIENCE,2022,10:17.
APA Li, Shangkun.,Ma, Xueyun.,Jiang, Shaohua.,Wang, Gen.,Zhang, Ting.,...&Wei, Zhifu.(2022).Long-term drying trend during 51.8-37.5 Ma in the Nangqian Basin, central-eastern Qinghai-Tibet Plateau.FRONTIERS IN EARTH SCIENCE,10,17.
MLA Li, Shangkun,et al."Long-term drying trend during 51.8-37.5 Ma in the Nangqian Basin, central-eastern Qinghai-Tibet Plateau".FRONTIERS IN EARTH SCIENCE 10(2022):17.

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来源：地质与地球物理研究所

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