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学科主题: 地球科学::地质学
题名: Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau
作者: Fang, XM (Fang, Xiaomin)1, 2, 3; Li, MH (Li, Minghui)1, 4; Wang, ZR (Wang, Zhengrong)5; Wang, JY (Wang, Jiuyi)1, 2; Li, J (Li, Jiao)1, 2, 6; Liu, XM (Liu, Xiaoming)1, 2; Zan, JB (Zan, Jinbo)1, 2
通讯作者: Li, MH
关键词: ACTIVE GEOTHERMAL SYSTEMS ; CLIMATE-CHANGE ; ENVIRONMENTAL-CHANGES ; TECTONIC UPLIFT ; ILLITE-SMECTITE ; CENTRAL-ASIA ; CHINA ; MAGNETOSTRATIGRAPHY ; EVOLUTION ; SEDIMENTATION
刊名: SCIENTIFIC REPORTS
发表日期: 2016
DOI: 10.1038/srep32848
卷: 6, 期:0, 页:32848
收录类别: SCI
合作性质: 国际
文章类型: Article
部门归属: 碰撞与隆升
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.
语种: 英语
WOS记录号: WOS:000383117200001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7605
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100085, Peoples R China
5.CUNY City Coll, Dept Earth & Atmospher Sci, New York, NY 10031 USA
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Fang, XM ,Li, MH ,Wang, ZR ,et al. Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau[J]. SCIENTIFIC REPORTS,2016,6(0):32848.
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