Initial movement of the Karakorum Fault in western Tibet: constraints from SHRIMP U-Pb dating of zircons
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- 作者：HaiBing Li (1) (3)
Franck Valli (2)
DunYi Liu (1) (4)
ZhiQin Xu (1)
JingSui Yang (1)
Nicolas Arnaud (5)
Paul Tapponnier (3)
Robin Lacassin (3)
SongYong Chen (1)
XueXiang Qi (1) - 关键词：ductile shear zone ; zircon SHRIMP U ; Pb dating ; Karakorum Fault ; Tibetan Plateau
- 刊名：Chinese Science Bulletin
- 出版年：2007
- 出版时间：April 2007
- 年：2007
- 卷：52
- 期：8
- 页码：1089-1100
- 全文大小：4586KB
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Franck Valli (2)
DunYi Liu (1) (4)
ZhiQin Xu (1)
JingSui Yang (1)
Nicolas Arnaud (5)
Paul Tapponnier (3)
Robin Lacassin (3)
SongYong Chen (1)
XueXiang Qi (1)
1. Laboratory of Continental Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China
3. Institut de Physique du Globe de Paris, 75252, Paris CX05, France
2. Department of Earth Science, Hongkong University, Hongkong, China
4. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China
5. ISTEEM-USTL, Place Eugene Bataillon, 34095, Montpellier CX5, France - ISSN：1861-9541
文摘
The Karakorum Fault zone (KFZ) plays an important role in understanding the formation, evolvement and deformation of the Tibetan Plateau. The high-T dextral shearing metamorphic rocks, e.g., mylonites or mylonitized gneisses-granites, locally crop out along the southeastern part of the KFZ in the Ayila Ri’gyü Range area. The SHRIMP U-Pb dating of the syn-kinematic crystallized zircons indicates that the initial age of the KFZ is ?7 Ma, ?0 Ma older than previous results. The extensive high-T dextral shearing along the KFZ started at least at 27-0 Ma, accompanied by the syn-kinematic emplacement of leuco-granites. Deformation and concomitant fluid circulation during shearing most likely occurred as early as at 25-3 Ma. The KFZ probably grew from southeast to northwest along the fault as a result of continuous convergence between the India plate and Eurasia plate.