气候变化领域集成服务门户(CCPortal): Rock magnetic record of core SG-3 since 1 Ma in the western Qaidam Basin and its paleoclimate implications for the NE Tibetan Plateau

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DOI	10.1016/j.palaeo.2020.109949
	Rock magnetic record of core SG-3 since 1 Ma in the western Qaidam Basin and its paleoclimate implications for the NE Tibetan Plateau
	Tan M.; Zhang W.; Fang X.; Yan M.; Zan J.; Zhang T.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	Quaternary saline lake deposits are well formed and widely distributed in the Qaidam Basin, on the northeastern Tibetan Plateau, NW China. Studying these lacustrine salt mineral deposits can improve our understanding of tectonic deformation, Asian interior aridification and monsoon climate associated with global cooling and Tibetan Plateau uplift. Previous paleoclimate records in the Qaidam Basin are mostly documented by geochemical proxies, pollen spectra and sedimentary characteristics; however, supporting evidence from the rock magnetic index of sediments with salt deposits in the basin has not been well studied. Here, we present a continuous, high-resolution 1.0 Myr rock magnetic record from the well-dated drill core SG-3 for typical saline lake deposits in the western Qaidam Basin. The results show that deposits with low magnetic susceptibility (χ) are caused by low contents of magnetic minerals with single-domain (SD) grains while those with high χ have relatively high contents of magnetic minerals with SD and pseudo-single-domain (PSD) grains. In full consideration of the sedimentary environment, weathering and erosion associated with the global climate since the middle Pleistocene, we propose that χ variations in the closed lake are mainly influenced by erosion intensity and precipitation. By combining the χ changes with pollen and grain size records, we infer that the drying process of central Asia since 1 Ma, with intensified aridity at 0.6 Ma and 0.13 Ma, was primarily induced by global cooling. © 2020 Elsevier B.V.
英文关键词	Drilling core; Global cooling; Quaternary; Rock magnetism; Salt-lake
语种	英语
scopus关键词	aridification; aridity; cooling; global climate; grain size; Pleistocene; uplift; China; Qaidam Basin; Qinghai; Qinghai-Xizang Plateau
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150283
作者单位	CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences (CAS), Beijing, 100101, China; Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Tan M.,Zhang W.,Fang X.,等. Rock magnetic record of core SG-3 since 1 Ma in the western Qaidam Basin and its paleoclimate implications for the NE Tibetan Plateau[J],2020,560.
APA	Tan M.,Zhang W.,Fang X.,Yan M.,Zan J.,&Zhang T..(2020).Rock magnetic record of core SG-3 since 1 Ma in the western Qaidam Basin and its paleoclimate implications for the NE Tibetan Plateau.Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Tan M.,et al."Rock magnetic record of core SG-3 since 1 Ma in the western Qaidam Basin and its paleoclimate implications for the NE Tibetan Plateau".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).