气候变化领域集成服务门户(CCPortal): Isotopic composition of gypsum hydration water in deep Core SG-1, western Qaidam basin (NE Tibetan Plateau), implications for paleoclimatic evolution

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DOI	10.1016/j.gloplacha.2017.06.006
	Isotopic composition of gypsum hydration water in deep Core SG-1, western Qaidam basin (NE Tibetan Plateau), implications for paleoclimatic evolution
	Li, Jiao; Li, Minghui; Fang, Xiaomin; Zhang, Gengxin; Zhang, Weilin; Liu, Xiaoming
通讯作者	Li, MH (通讯作者)
发表日期	2017
ISSN	0921-8181
EISSN	1872-6364
起始页码	70
结束页码	77
卷号	155
英文摘要	The oxygen and hydrogen isotopic compositions of gypsum hydration water can be useful for determining the isotopic composition of the original brine from which gypsum precipitated. However, relatively few long-term and continuous records of the stable isotope geochemistry of gypsum hydration water in arid regions have been reported. We measured the 8180 and SD of primary gypsum hydration water from a 938.5 m-long deep core (SG-1) in the western Qaidam Basin to study the mechanisms that contributed to gypsum formation and to reconstruct potential paleoclimatic change. The measured delta O-18 and delta D ranged from - 4.21%o to 8.69%o and from - 72.77%o to 49.73%o, respectively. The linear relationship between delta O-18 and delta D indicates that meteoric water was the original source of the gypsum hydration water. The gradient of 5.39 for the delta O-18 and SD plots is lower than that of global meteoric water, suggesting that paleo-lakewater evaporated and became a CaSO4-rich brine leading to gypsum deposition. The evaporation/precipitation (E/P) ratio played an important role in determining delta O-18 and SD. The oscillations noted in the delta O-18 and SD of the gypsum hydration water imply that: (a) there was a long-term and stepwise aridification after similar to 2.2 Ma in the western Qaidam Basin; and (b) there were three increasingly dry phases at 2.2-1.2 Ma, 1.2-0.6 Ma, and 0.6-0.1 Ma, with two cold and dry events at similar to 1 Ma and similar to 0.6 Ma. Global cooling, especially during the Mid Pleistocene Climate Transition event (MPT), may have been the primary cause of the aridification recorded in core SG-1 in the Asian inland.
关键词	MIDPLEISTOCENE CLIMATE TRANSITION RESOLUTION MAGNETO STRATIGRAPHY CHINESE LOESS PLATEAU CENOZOIC DEFORMATION EVAPORITE MINERALS QINGHAI PROVINCE AMERICAN-WEST SOUTHERN ASIA CENTRAL IRAN M SEDIMENTS
英文关键词	Gypsum hydration water; Stable isotopes; Paleoclimate; Qaidam Basin
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000408783700007
来源期刊	GLOBAL AND PLANETARY CHANGE
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/258939
推荐引用方式 GB/T 7714	Li, Jiao,Li, Minghui,Fang, Xiaomin,et al. Isotopic composition of gypsum hydration water in deep Core SG-1, western Qaidam basin (NE Tibetan Plateau), implications for paleoclimatic evolution[J]. 中国科学院青藏高原研究所,2017,155.
APA	Li, Jiao,Li, Minghui,Fang, Xiaomin,Zhang, Gengxin,Zhang, Weilin,&Liu, Xiaoming.(2017).Isotopic composition of gypsum hydration water in deep Core SG-1, western Qaidam basin (NE Tibetan Plateau), implications for paleoclimatic evolution.GLOBAL AND PLANETARY CHANGE,155.
MLA	Li, Jiao,et al."Isotopic composition of gypsum hydration water in deep Core SG-1, western Qaidam basin (NE Tibetan Plateau), implications for paleoclimatic evolution".GLOBAL AND PLANETARY CHANGE 155(2017).