气候变化领域集成服务门户(CCPortal): An Eocene-Miocene continuous rock magnetic record from the sediments in the Xining Basin, NW China: indication for Cenozoic persistent drying driven by global cooling and Tibetan Plateau uplift

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DOI	10.1093/gji/ggv002
	An Eocene-Miocene continuous rock magnetic record from the sediments in the Xining Basin, NW China: indication for Cenozoic persistent drying driven by global cooling and Tibetan Plateau uplift
	Fang, Xiaomin; Zan, Jinbo; Appel, Erwin; Lu, Yin; Song, Chunhui; Dai, Shuang; Tuo, Shibo
通讯作者	Fang, XM (通讯作者)
发表日期	2015
ISSN	0956-540X
EISSN	1365-246X
起始页码	78
结束页码	89
卷号	201 期号:1
英文摘要	Tibetan Plateau uplift and global cooling have generally been thought to have caused the drying of the Asian inland, but how and when these factors drove the aridification is unknown. The Xining Basin at the NE Tibetan Plateau received continuous Eocene-Miocene fine-grained sediments, providing an excellent opportunity to address this question. Here we present detailed rock magnetic and diffuse reflectance spectroscopy (DRS) analyses for a well-dated Cenozoic sedimentary record from the Xiejia section in the basin. Magnetic susceptibility (chi), saturation magnetization (Ms) and saturation isothermal remanent magnetization (SIRM) in this section show a long-term decreasing trend from similar to 52 to similar to 25 Ma, well coinciding with global cooling and drying in the region, and an increasing trend since similar to 25 Ma, which is in contrast to the further progressing aridification of the basin. Thermomagnetic results and DRS-determined hematite contents suggest that the relative content of magnetite and hematite is the main control on the chi, Ms and SIRM values. We argue that the long-term Eocene-Oligocene global cooling increased the drying of the Asian inland, lowering the lake level and exposing a larger area to low temperature oxidation for longer times, thus producing more hematite and leading to the decreasing trend of magnetic concentration parameters from similar to 52 to similar to 25 Ma. An intensive uplift of the NE Tibetan Plateau since similar to 25 Ma, associated with a change in the sedimentary source, might be responsible for the increase of chi, Ms and SIRM after 25 Ma.
关键词	LOESS-PALEOSOL SEQUENCES LOW-TEMPERATURE OXIDATION LOESS/PALEOSOL SEQUENCE SUSCEPTIBILITY RECORD NORTHERN-HEMISPHERE ASIAN ARIDIFICATION TECTONIC EVOLUTION CLIMATE-CHANGE FISSION-TRACK MA
英文关键词	Environmental magnetism; Magnetic mineralogy and petrology; Rock and mineral magnetism; Asia
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000355153000006
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
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/258507
推荐引用方式 GB/T 7714	Fang, Xiaomin,Zan, Jinbo,Appel, Erwin,et al. An Eocene-Miocene continuous rock magnetic record from the sediments in the Xining Basin, NW China: indication for Cenozoic persistent drying driven by global cooling and Tibetan Plateau uplift[J]. 中国科学院青藏高原研究所,2015,201(1).
APA	Fang, Xiaomin.,Zan, Jinbo.,Appel, Erwin.,Lu, Yin.,Song, Chunhui.,...&Tuo, Shibo.(2015).An Eocene-Miocene continuous rock magnetic record from the sediments in the Xining Basin, NW China: indication for Cenozoic persistent drying driven by global cooling and Tibetan Plateau uplift.GEOPHYSICAL JOURNAL INTERNATIONAL,201(1).
MLA	Fang, Xiaomin,et al."An Eocene-Miocene continuous rock magnetic record from the sediments in the Xining Basin, NW China: indication for Cenozoic persistent drying driven by global cooling and Tibetan Plateau uplift".GEOPHYSICAL JOURNAL INTERNATIONAL 201.1(2015).