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

ISL OpenIR > 青海盐湖研究所知识仓储

	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 1,2,3; Fang, Xiaomin 1; Appel, Erwin 3; Wang, Jiuyi 1; Herb, Christian 3; Han, Wenxia 4; Wu, Fuli 1; Song, Chunhui 5,6
	2015-04-15
发表期刊	SEDIMENTARY GEOLOGY
卷号	319 页码:40-51
关键词	Grain Size Lithofacies Anticline Uplift Climate Change Qaidam Basin
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.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5565
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Tubingen, Dept Geosci, D-72074 Tubingen, Germany 4.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China 5.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China 6.Lanzhou Univ, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou 730000, Peoples R China
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]. SEDIMENTARY GEOLOGY,2015,319:40-51.
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,319,40-51.
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):40-51.