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学科主题: 地球科学::地质学
题名: Late Eocene clay boron-derived paleosalinity in the Qaidam Basin and its implications for regional tectonics and climate
作者: Ye, CC (Ye, Chengcheng)1, 4; Yang, YB (Yang, Yibo)1, 2, 3; Fang, XM (Fang, Xiaomin)1, 2, 3; Zhang, WL (Zhang, Weilin)1, 2, 3
通讯作者: Yang, YB
关键词: NORTHERN TIBETAN PLATEAU ; ALTYN-TAGH FAULT ; MIDDLE EOCENE ; SEDIMENTARY RECORD ; ASIAN MONSOON ; EVOLUTION ; UPLIFT ; MARINE ; GROWTH ; CHINA
刊名: SEDIMENTARY GEOLOGY
发表日期: 2016
DOI: 10.1016/j.sedgeo.2016.10.006
卷: 346, 期:0, 页:49-59
收录类别: SCI
合作性质: 国内
文章类型: Article
英文摘要: The Qaidam Basin, located on the northeastern Tibetan Plateau and containing Cenozoic sediments with a maximum thickness of similar to 12,000 m, is an ideal place to study the phased uplift of the NE Tibetan Plateau and regional climate change. The estimation of the paleosalinity of sedimentary environments not only helps to evaluate the evolution of lakes in this region but offers insights into contemporaneous climate change. We present detailed geochemical and mineralogical investigations from the lacustrine interval of the Hongliugou section in the northern Qaidam Basin to reconstruct salinity fluctuations in the paleolake during the late Eocene era (similar to 42.0-35.5 Ma). The clay mineral assemblages mainly contain smectite, illite, chlorite, kaolinite and irregular illite/smectite mixed layers. Clay boron-derived paleosalinity estimates (equivalent boron content, Couch's paleosalimeter and B/Ga ratios) along with other proxies sensitive to salinity changes (e.g., Rb/K ratios and ostracod assemblages) collectively indicate an overall brackish sedimentary environment with a higher-salinity period at approximately 40.0 similar to 39.2 Ma. This higher-salinity period indicates a more arid environment and is probably related to global cooling. However, the global cooling in late Eocene cannot explain the overall stable long-term salinity pattern, implying that other factors exist. We propose that the migration of the Yiliping depression depocenter in the northern Qaidam and increased orographic rainfall induced by late Eocene tectonic activity at the northern margin of the basin might have partly offset the increase in salinity driven by global cooling. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000390738300005
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7481
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, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Beijing 100101, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Ye, CC ,Yang, YB ,Fang, XM ,et al. Late Eocene clay boron-derived paleosalinity in the Qaidam Basin and its implications for regional tectonics and climate[J]. SEDIMENTARY GEOLOGY,2016,346(0):49-59.
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