EVIDENCE OF ZIRCON U-Pb AGES FOR THE FORMATION TIME OF THE EAST KUNLUN LEFT-LATERAL DUCTILE SHEAR BELT

ZHANG Zi-cheng; ZHANG Xu-jiao; GAO Wan-li; HU Dao-gong; LU Lu

Volume 16 Issue 1

Mar. 2010

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ZHANG Zi-cheng, ZHANG Xu-jiao, GAO Wan-li, et al., 2010. EVIDENCE OF ZIRCON U-Pb AGES FOR THE FORMATION TIME OF THE EAST KUNLUN LEFT-LATERAL DUCTILE SHEAR BELT. Journal of Geomechanics, 16 (1): 51-58.

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EVIDENCE OF ZIRCON U-Pb AGES FOR THE FORMATION TIME OF THE EAST KUNLUN LEFT-LATERAL DUCTILE SHEAR BELT

1.
College of Earth Science and Resources, China University of Geosciences, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China

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Received: 2009-12-18
Published: 2010-03-28

Abstract

Abstract

The large-scale East Kunlun left-lateral ductile shear belt was formed by an oblique collision between the Bayan Har-Songpan-Ganzi terrain and the southern East Kunlun terrain during the Late Triassic. During the Cenozoic, this ductile shear belt was transformed into a brittle leftlateral strike-slip belt, and became the north boundary for the eastward "escape" of the QinghaiTibet Plateau. The La-MC-ICPMS dating for two syntectonic granite-porphyry veins in the large ductile shear belt yielded two weighted zircon ²⁰⁶Pb/²³⁸U ages of 196.4 ± 2.3 Ma and 195.1 ± 1.6 Ma. These ages suggest that the East Kunlun left-lateral ductile shear belt should form during the early Yanshanian Movement.
- ductile shear belt,
- zircon U-Pb age,
- Early Yanshan Movement,
- East Kunlun orogenic

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References

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