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Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau
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; Li, MH
Source PublicationSCIENTIFIC REPORTS
2016
Volume6Issue:0Pages:32848
DOI10.1038/srep32848
AbstractUplift 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.
Subject Area地质学
WOS IDWOS:000383117200001
Language英语
Indexed BySCI
KeywordActive Geothermal Systems Climate-change Environmental-changes Tectonic Uplift Illite-smectite Central-asia China Magnetostratigraphy Evolution Sedimentation
Cooperation Status国际
Department碰撞与隆升
SubtypeArticle
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Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7605
Collection图书馆
Corresponding AuthorLi, MH
Affiliation1.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
GB/T 7714
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.
APA Fang, XM .,Li, MH .,Wang, ZR .,Wang, JY .,Li, J .,...&Li, MH.(2016).Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau.SCIENTIFIC REPORTS,6(0),32848.
MLA Fang, XM ,et al."Oscillation of mineral compositions in Core SG-1b, western Qaidam Basin, NE Tibetan Plateau".SCIENTIFIC REPORTS 6.0(2016):32848.
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