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High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma
Wolff, R (Wolff, Reinhard)1; Hetzel, R (Hetzel, Ralf)1; Dunkl, I (Dunkl, Istvan)2; Xu, Q (Xu, Qiang)3; Brocker, M (Broecker, Michael)4; Anczkiewicz, AA (Anczkiewicz, Aneta A.)5
Source PublicationJOURNAL OF GEOLOGY
2019
Volume127Issue:1Pages:15-36
DOI10.1086/700406
Abstract

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.

Subject AreaGeology
WOS IDWOS:000454585300002
Language英语
Indexed BySCI
KeywordLow-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
WOS Research AreaGeology
WOS SubjectGeology
Cooperation Status国际
ISSN0022-1376
Department大陆碰撞与高原隆升
URL查看原文
PublisherUNIV CHICAGO PRESS
SubtypeArticle
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9460
Collection图书馆
Corresponding AuthorWolff, R (Wolff, Reinhard)
Affiliation1.Westfalische Wilhelms Univ Munster, Inst Geol & Palaontol, Corrensstr 24, D-48149 Munster, Germany;
2.Univ Gottingen, Inst Sedimentol & Umweltgeol, Goldschmidtstr 3, D-37077 Gottingen, Germany;
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Lincui Rd, Beijing 100101, Peoples R China;
4.Westfalische Wilhelms Univ Munster, Inst Mineral, Corrensstr 24, D-48149 Munster, Germany;
5.[Anczkiewicz, Aneta A.] Polish Acad Sci, Inst Geol Sci, Senacka 1, PL-31002 Krakow, Poland.
Recommended Citation
GB/T 7714
Wolff, R ,Hetzel, R ,Dunkl, I ,et al. High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma[J]. JOURNAL OF GEOLOGY,2019,127(1):15-36.
APA Wolff, R ,Hetzel, R ,Dunkl, I ,Xu, Q ,Brocker, M ,&Anczkiewicz, AA .(2019).High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma.JOURNAL OF GEOLOGY,127(1),15-36.
MLA Wolff, R ,et al."High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since similar to 15 Ma".JOURNAL OF GEOLOGY 127.1(2019):15-36.
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