干旱区生态环境知识资源中心(Arid): Long-term drying trend during 51.8-37.5 Ma in the Nangqian Basin, central-eastern Qinghai-Tibet Plateau

Arid

DOI	10.3389/feart.2022.866304
	Long-term drying trend during 51.8-37.5 Ma in the Nangqian Basin, central-eastern Qinghai-Tibet Plateau
	Li, Shangkun; Ma, Xueyun; Jiang, Shaohua; Wang, Gen; Zhang, Ting; He, Wei; Yu, Xiaoli; Ma, He; Zhang, Pengyuan; Wei, Jingyi; Wang, Yongli; Wei, Zhifu
通讯作者	Wei, ZF
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2022
卷号	10
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.
英文关键词	biomarkers paleoclimate paleovegetation Nangqian Basin Qinghai-Tibet Plateau
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000861273000001
WOS关键词	ASIAN MONSOONS ; N-ALKANES ; ENVIRONMENTAL IMPLICATIONS ; GENERAL-CIRCULATION ; EURASIAN CLIMATE ; SUBTROPICAL JET ; LAKE-SEDIMENTS ; LUNPOLA BASIN ; SOUTHERN ASIA ; TARIM BASIN
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392683
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],2022,10.
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.
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).