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Clay mineralogy of an Eocene fluvial-lacustrine sequence in Xining Basin, Northwest China, and its paleoclimatic implications
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- 英文篇名:Clay mineralogy of an Eocene fluvial-lacustrine sequence in Xining Basin, Northwest China, and its paleoclimatic implications
- 作者:Bin ; HU ; Chunxia ; ZHANG ; Haibin ; WU ; Qingzhen ; HAO ; Zhengtang ; GUO
- 英文作者:Bin HU;Chunxia ZHANG;Haibin WU;Qingzhen HAO;Zhengtang GUO;Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences;Institution of Earth Science, Chinese Academy of Science;College of Earth Science and Engineering, Shandong University of Science and Technology;CAS Center for Excellence in Life and Paleoenvironment;University of Chinese Academy of Sciences;
- 英文关键词:Eocene;;Xining Basin;;Clay minerals;;Paleoclimate
- 中文刊名:Science China(Earth Sciences)
- 英文刊名:中国科学:地球科学(英文版)
- 机构:Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences;Institution of Earth Science, Chinese Academy of Science;College of Earth Science and Engineering, Shandong University of Science and Technology;CAS Center for Excellence in Life and Paleoenvironment;University of Chinese Academy of Sciences;
- 出版日期:2019-01-22 15:41
- 出版单位:Science China(Earth Sciences)
- 年:2019
- 期:03
- 基金:supported by the National Natural Science Foundation of China (Grant Nos. 41722206, 41430531, 41690114 & 41374072);;
the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB26000000);;
the International Cooperation Program of the Chinese Academy of Sciences (Grant No. 131C11KYSB20160061)
- 语种:英文;
- 页:87-100
- 页数:14
- CN:11-5843/P
- ISSN:1674-7313
- 分类号:P532
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摘要
The Eocene was marked by significant cooling during which the global climate was transformed from greenhouse to icehouse conditions. Notable coeval events were the India-Asia collision and the retreat of the Paratethys Sea in Asia. The Eocene section of the long and continuous sedimentary succession of the Xining Basin in Northwest China is characterized by red mudstones with intercalated gypsum and muddy-gypsiferous layers. In this study, we conducted a semi-quantitative analysis of the mineralogy of bulk samples and the clay fraction using X-ray diffraction, with the aim of characterizing the Eocene climatic evolution of the northeastern margin of the Tibetan Plateau and inland Asia. We used a new pretreatment method to address the problem of extracting sufficient clay particles from the gypsum and gypsiferous layers. The bulk mineralogy is dominated by quartz, feldspar, calcite, gypsum and dolomite; and the clay mineralogy is dominated by illite, chlorite, and smectite(including irregular mixed-layer illite-smectite(I/S)). The variations of the clay mineral assemblages indicate the occurrence of alternations between warm humid conditions and hot dry conditions, with relatively high humidity during ~52–50,~41.5–39 and ~35–34 Ma. Comparison of the results with the timing of Tibetan Plateau uplift, transgressions and regressions of the Paratethys Sea, and the marine oxygen isotope record suggest that the Eocene climatic evolution of the study region was driven fundamentally by global climate change. The Eocene was marked by significant cooling during which the global climate was transformed from greenhouse to icehouse conditions. Notable coeval events were the India-Asia collision and the retreat of the Paratethys Sea in Asia. The Eocene section of the long and continuous sedimentary succession of the Xining Basin in Northwest China is characterized by red mudstones with intercalated gypsum and muddy-gypsiferous layers. In this study, we conducted a semi-quantitative analysis of the mineralogy of bulk samples and the clay fraction using X-ray diffraction, with the aim of characterizing the Eocene climatic evolution of the northeastern margin of the Tibetan Plateau and inland Asia. We used a new pretreatment method to address the problem of extracting sufficient clay particles from the gypsum and gypsiferous layers. The bulk mineralogy is dominated by quartz, feldspar, calcite, gypsum and dolomite; and the clay mineralogy is dominated by illite, chlorite, and smectite(including irregular mixed-layer illite-smectite(I/S)). The variations of the clay mineral assemblages indicate the occurrence of alternations between warm humid conditions and hot dry conditions, with relatively high humidity during ~52–50,~41.5–39 and ~35–34 Ma. Comparison of the results with the timing of Tibetan Plateau uplift, transgressions and regressions of the Paratethys Sea, and the marine oxygen isotope record suggest that the Eocene climatic evolution of the study region was driven fundamentally by global climate change.
引文
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