气候变化领域集成服务门户(CCPortal): A 7.3-1.6 Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau

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DOI	10.1016/j.sedgeo.2015.01.008
	A 7.3-1.6 Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau
	Lu, Yin; Fang, Xiaomin; Appel, Erwin; Wang, Jiuyi; Herb, Christian; Han, Wenxia; Wu, Fuli; Song, Chunhui
通讯作者	Fang, XM (通讯作者)
发表日期	2015
ISSN	0037-0738
EISSN	1879-0968
起始页码	40
结束页码	51
卷号	319
英文摘要	How sediment grain size corresponds to both climate change and tectonics is increasingly the focus of debate. The shrinkage and migration of the huge paleo-lake in the western Qaidam Basin (WQB), NE Tibetan Plateau (TP) provide an excellent case study. We present a nearly 6 Ma well-dated high-resolution grain size record from the 723-m-deep drill core SG-1b (located in the Jianshan Anticline in the WQB) to show how sediment grain size responds to anticline growth and climate change. The results show that variations in grain size represent three distinct phases. Phase I(7.3-3.6 Ma) is characterized by fine sediments with good sorting, with a predominance of clay and fine silt. During this phase, the drilling site was in a deep to semi-deep lake environment, the Jianshan Anticline has undergone relatively weak tectonics and the climate was dry, but still much wetter than that in the Quaternary; grain size variation and lacustrine deposition were principally controlled by climate. Phase II (similar to 3.6-33 Ma) was a transitional period characterized by a rapid shift toward consistently coarser sediments with increased volumes of medium-coarse silt and sand. During this phase, the drilling site underwent a dramatic shift to a shallow lake environment, the anticline experienced rapid uplift and the climate was in an episode of rapid drying; grain size variation and lacustrine deposition were principally controlled by tectonics in the Jianshan Anticline. Phase III (similar to 3.3-1.6 Ma) was a period exhibiting a long-term fining trend in mean grain size relative to Phase II, but still much coarser than that of Phase I, and with a distinct and prolonged increase in very fine sediments accompanied by poor sorting. During this phase, the drilling site was in a shallow lake environment between 3.3 Ma and 1.9 Ma, and finally became a lakeshore-like environment between 1.9 Ma and 1.6 Ma; the anticline experienced rapid and continuous uplift and the climate was in a long-term stepwise drying and cooling trend. A conceptual model was drawn to show how grain size and lacustrine deposition responded to uplift of the Jianshan Anticline and climate change in the Qaidam Basin. (C) 2015 Elsevier B.V. All rights reserved.
关键词	CENOZOIC TECTONIC EVOLUTION ALTYN-TAGH FAULT EVAPORITE MINERALS GROWTH STRATA M SEDIMENTS DUST STORM QINGHAI EROSION CORE LAKE
英文关键词	Grain size; Lithofacies; Anticline uplift; Climate change; Qaidam Basin
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000351795400004
来源期刊	SEDIMENTARY GEOLOGY
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/258563
推荐引用方式 GB/T 7714	Lu, Yin,Fang, Xiaomin,Appel, Erwin,et al. A 7.3-1.6 Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2015,319.
APA	Lu, Yin.,Fang, Xiaomin.,Appel, Erwin.,Wang, Jiuyi.,Herb, Christian.,...&Song, Chunhui.(2015).A 7.3-1.6 Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau.SEDIMENTARY GEOLOGY,319.
MLA	Lu, Yin,et al."A 7.3-1.6 Ma grain size record of interaction between anticline uplift and climate change in the western Qaidam Basin, NE Tibetan Plateau".SEDIMENTARY GEOLOGY 319(2015).