气候变化领域集成服务门户(CCPortal): Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau

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DOI	10.1038/srep32848
	Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau
	Fang, Xiaomin; Li, Minghui; Wang, Zhengrong; Wang, Jiuyi; Li, Jiao; Liu, Xiaoming; Zan, Jinbo
通讯作者	Li, MH (通讯作者)
发表日期	2016
ISSN	2045-2322
卷号	6
英文摘要	Uplift of the Tibetan Plateau since the Late Miocene has greatly affected the nature of sediments deposited in the Qaidam Basin. However, due to the scarcity of continuously dated sediment records, we know little about how minerals responded to this uplift. In order to understand this response, we here present results from the high-resolution mineral profile from a borehole (7.3-1.6 Ma) in the Basin, which shows systematic oscillations of various evaporite and clay minerals that can be linked to the variation of regional climate and tectonic history. In particular, x-ray diffraction (XRD) analyses show that carbonate minerals consist mainly of calcite and aragonite, with minor ankerite and dolomite. Evaporates consist of gypsum, celesite and halite. Clay minerals are principally Fe-Mg illite, mixed layers of illite/smectite and chlorite, with minor kaolinite and smectite. Following implications can be drawn from the oscillations of these minerals phases: (a) the paleolake was brackish with high salinity after 7.3 Ma, while an abrupt change in the chemical composition of paleolake water (e.g. Mg/Ca ratio, SO42- concentration, salinity) occurred at 3.3 Ma; (b) the three changes at similar to 6.0 Ma, 4.5-4.1 Ma and 3.3 Ma were in response to rapid erosions/uplift of the basin; (c) pore water or fluid was Fe/Mg-rich in 7.3-6.0 Ma, Mg-rich in 6.0-4.5 Ma, and K-rich in 4.1-1.6 Ma; and (d) evaporation rates were high, but weaker than today's.
关键词	ACTIVE GEOTHERMAL SYSTEMS CLIMATE-CHANGE ENVIRONMENTAL-CHANGES TECTONIC UPLIFT ILLITE-SMECTITE CENTRAL-ASIA CHINA MAGNETOSTRATIGRAPHY EVOLUTION SEDIMENTATION
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000383117200001
来源期刊	SCIENTIFIC REPORTS
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/258787
推荐引用方式 GB/T 7714	Fang, Xiaomin,Li, Minghui,Wang, Zhengrong,et al. Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2016,6.
APA	Fang, Xiaomin.,Li, Minghui.,Wang, Zhengrong.,Wang, Jiuyi.,Li, Jiao.,...&Zan, Jinbo.(2016).Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau.SCIENTIFIC REPORTS,6.
MLA	Fang, Xiaomin,et al."Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau".SCIENTIFIC REPORTS 6(2016).