气候变化领域集成服务门户(CCPortal): Early tectonic uplift of the northern Tibetan Plateau

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DOI	10.1360/03wd0255
	Early tectonic uplift of the northern Tibetan Plateau
	Dai, SA; Fang, XM; Song, CH; Gao, JP; Gao, DL; Li, JJ
发表日期	2005
ISSN	1001-6538
EISSN	1861-9541
起始页码	1642
结束页码	1652
卷号	50 期号:15
英文摘要	The Hexi Corridor is the northmost foreland basin of the Tibetan Plateau and its formation is controlled by the northern marginal fault of Tibet, Altyn Tagh Fault (ATF)-North Qilian Shan marginal Fault (NQF), and the southern Kuantan Shan-Longshou Shan Fault (KLF). So its study is important to understanding the mechanism of Tibet formation and its influence on global climate change. The oldest Cenozoic sediments in the Corridor is the Huoshaogou Formation which consists of terrigenous fine conglomerate, sandstone, sandy mudstone and mudstone, depositing in alluvial to lacustrine and fan delta sedimentary environments. Detailed paleomagnetic measurements of this sequence at Yumen clearly reveal eleven pairs of normal and reversed polarities. Fossil mammals found around the section support that most of the observed polarities can be well correlated with chrons between 13n and 18r of the standard geomagnetic polarity time scale, yielding ages of 40.2-33.35 Ma. The mean declinations of this sequence and its immediately above stratigraphy indicate an 18.3 degrees rapid clockwise rotation of the Hexi Corridor. Since this sequence has been strongly folded and is capped by an angular unconformity, we think that the presence of the thick alluvial fan conglomeration at the bottom of the foreland basin may indicate the initial deformation and uplift of the northern Qilian Shan. This process could occur at latest at 40.2 Ma, driven by the faults NQF and KLF that thrust onto the Hexi corridor respectively from its southern and northern margins. These faults are in an early response to the collision of India with Asia, while the unconformable termination and rotation of the Huoshaogou Formation at similar to 33.35 Ma indicate other early episode of rapid tectonic deformation and uplift of the northern Tibet.
关键词	ALTYN-TAGH FAULT CENOZOIC TECTONICS FISSION-TRACK HEXI CORRIDOR QILIAN SHAN COLLISION INDIA EVOLUTION DISPLACEMENT BASINS
英文关键词	hexi corridor; Huoshaogou formation; Cenozoic magnetostratigraphy; Tibet uptift
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000232609500019
来源期刊	CHINESE SCIENCE BULLETIN
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/257384
推荐引用方式 GB/T 7714	Dai, SA,Fang, XM,Song, CH,et al. Early tectonic uplift of the northern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2005,50(15).
APA	Dai, SA,Fang, XM,Song, CH,Gao, JP,Gao, DL,&Li, JJ.(2005).Early tectonic uplift of the northern Tibetan Plateau.CHINESE SCIENCE BULLETIN,50(15).
MLA	Dai, SA,et al."Early tectonic uplift of the northern Tibetan Plateau".CHINESE SCIENCE BULLETIN 50.15(2005).