气候变化领域集成服务门户(CCPortal): High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma

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DOI	10.1086/700406
	High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma
	Wolff, Reinhard; Hetzel, Ralf; Dunkl, Istvan; Xu, Qiang; Broecker, Michael; Anczkiewicz, Aneta A.
通讯作者	Wolff, R (通讯作者)
发表日期	2019
ISSN	0022-1376
EISSN	1537-5269
起始页码	15
结束页码	36
卷号	127 期号:1
英文摘要	Several active graben systems in Tibet and the Himalaya are the expression of ongoing east-west extension, but the significance and history of normal faulting in this large region are still debated. Here, we present geo- and thermochronological data for a granite intrusion in the footwall of an active high-angle normal fault at the Tangra Yumco graben to constrain the onset and history of normal faulting. Crystallization of the granitic rocks occurred at 87 +/- 1 Ma, as revealed by U/Pb zircon dating. After an initial phase of rapid cooling from magmatic temperatures, a later phase of slow cooling is recorded by Rb/Sr biotite ages between similar to 72 and similar to 60 Ma. The elevation dependence of the Rb/Sr ages suggests that cooling was controlled by erosion, which proceeded at a rate of similar to 0.05 km/My during the latest Cretaceous and early Paleocene. The subsequent history of normal faulting is recorded by zircon (U-Th)/He ages of 12.5 +/- 1.1 and 9.7 +/- 0.7 Ma, apatite fission-track ages between 10.8 +/- 1.7 and 7.8 +/- 1.2 Ma, and apatite (U-Th)/He ages from 4.9 +/- 0.4 to 3.0 +/- 0.2 Ma. Thermokinematic modeling of these age data indicates that normal faulting started at 14.5 +/- 1.8 Ma at a rate of similar to 0.3 km/My and accelerated to similar to 0.7 km/My in the Pliocene. Our age constraint for the initiation of faulting supports a widespread onset of rifting in Tibet at similar to 15-10 Ma, as reported for other graben systems. Finally, we suggest that the distribution of high-angle and low-angle normal faults is controlled by their position relative to the India-Asia convergence vector and by lateral variations in the thermal state of the lithosphere.
关键词	LOW-TEMPERATURE THERMOCHRONOMETRY METAMORPHIC CORE COMPLEX FORELAND BASIN EVOLUTION INDIA-ASIA COLLISION EAST-WEST EXTENSION SUTURE ZONE U-PB TECTONIC EVOLUTION CRUSTAL XENOLITHS (U-TH)/HE THERMOCHRONOMETRY
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000454585300002
来源期刊	JOURNAL OF 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/259576
推荐引用方式 GB/T 7714	Wolff, Reinhard,Hetzel, Ralf,Dunkl, Istvan,et al. High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma[J]. 中国科学院青藏高原研究所,2019,127(1).
APA	Wolff, Reinhard,Hetzel, Ralf,Dunkl, Istvan,Xu, Qiang,Broecker, Michael,&Anczkiewicz, Aneta A..(2019).High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma.JOURNAL OF GEOLOGY,127(1).
MLA	Wolff, Reinhard,et al."High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma".JOURNAL OF GEOLOGY 127.1(2019).