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, Mengqi; Zhang, Weilin; Fang, Xiaomin; Yan, Maodu; Zan, Jinbo; Zhang, Tao
通讯作者	Zhang, WL (通讯作者)
发表日期	2020
ISSN	0031-0182
EISSN	1872-616X
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 geo-chemical 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 (chi) are caused by low contents of magnetic minerals with single-domain (SD) grains while those with high. 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 chi variations in the closed lake are mainly influenced by erosion intensity and precipitation. By combining the chi 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.
关键词	CENOZOIC TECTONIC EVOLUTION GRAIN-SIZE DISTRIBUTION ALTYN-TAGH FAULT CLIMATE-CHANGE ASIAN ARIDIFICATION SOUTHERN ASIA UPLIFT LOESS MAGNETOSTRATIGRAPHY DEFORMATION
英文关键词	Salt-lake; Rock magnetism; Drilling core; Quaternary; Global cooling
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000591245000003
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259715
推荐引用方式 GB/T 7714	Tan, Mengqi,Zhang, Weilin,Fang, Xiaomin,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[J]. 中国科学院青藏高原研究所,2020,560.
APA	Tan, Mengqi,Zhang, Weilin,Fang, Xiaomin,Yan, Maodu,Zan, Jinbo,&Zhang, Tao.(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, Mengqi,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).