Timing of Displacement along the Yardoi Detachment Fault, Southern Tibet: Insights from Zircon U-Pb and Mica <sup>40</sup>Ar-<sup>39</sup>Ar Geochronology

Hanwen Dong; Yuanku Meng; Zhiqin Xu; Hui Cao; Zhiyu Yi; Zeliang Ma

doi:10.1007/s12583-019-1223-z

Volume 30 Issue 3

Jun 2019

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Journal of Earth Science > 2019 > 30(3): 535-548.

Hanwen Dong, Yuanku Meng, Zhiqin Xu, Hui Cao, Zhiyu Yi, Zeliang Ma. Timing of Displacement along the Yardoi Detachment Fault, Southern Tibet: Insights from Zircon U-Pb and Mica 40Ar-39Ar Geochronology. Journal of Earth Science, 2019, 30(3): 535-548. doi: 10.1007/s12583-019-1223-z

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Hanwen Dong, Yuanku Meng, Zhiqin Xu, Hui Cao, Zhiyu Yi, Zeliang Ma. Timing of Displacement along the Yardoi Detachment Fault, Southern Tibet: Insights from Zircon U-Pb and Mica ⁴⁰Ar-³⁹Ar Geochronology. Journal of Earth Science, 2019, 30(3): 535-548. doi: 10.1007/s12583-019-1223-z

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Timing of Displacement along the Yardoi Detachment Fault, Southern Tibet: Insights from Zircon U-Pb and Mica ⁴⁰Ar-³⁹Ar Geochronology

doi: 10.1007/s12583-019-1223-z

1.
Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

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Corresponding author: Hui Cao
Received Date: 20 Oct 2018
Accepted Date: 10 Jan 2019
Publish Date: 01 Jun 2019

Abstract

Abstract

The Yardoi dome is located in the eastern end of the northwest-southeast extending North Himalayan domes (NHD). The dome exposes a granite pluton in the core and three lithologictectonic units separated by the upper detachment fault and the lower detachment fault. The Yardoi detachment fault (YDF), corresponding to the lower detachment fault, is a 800 m strongly deformed top-NW shear zone. LA-ICP-MS zircon U-Pb dating yielded a crystallization ages of 19.57±0.23 to 15.5±0.11 Ma for the leucogranite dyke swarm, which indicates that the ductile motion along the YDF began at ca. 20 Ma. The ⁴⁰Ar/³⁹Ar muscovite ages of 14.05±0.2 to 13.2±0.2 Ma and the ⁴⁰Ar/³⁹Ar biotite age of 13.15±0.2 Ma, suggest that the exhumation led to cooling through the 370℃ Ar closure temperature in muscovite at~14 Ma to the 335℃ Ar closure temperature in biotite at~13 Ma. Our new geochronological data from the Yardoi dome and other domes in the Tethyan Himalayan Sequences suggest that the ductile deformation in the region began at or before~36 Ma in a deep tectonic level, resulting in southward ductile flow at the mid-crustal tectonic level that continued from 20 to 13 Ma. Comparing the Yardoi dome to other domes in the NHD, the cooling ages show a clear diachronism and they are progressively younger from the West Himalayan to the East Himalayan.
- leucogranite,
- geochronology,
- Yardoi dome,
- southern Tibet,
- Himalayan Orogen

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Timing of Displacement along the Yardoi Detachment Fault, Southern Tibet: Insights from Zircon U-Pb and Mica ⁴⁰Ar-³⁹Ar Geochronology

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Timing of Displacement along the Yardoi Detachment Fault, Southern Tibet: Insights from Zircon U-Pb and Mica 40Ar-39Ar Geochronology

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Timing of Displacement along the Yardoi Detachment Fault, Southern Tibet: Insights from Zircon U-Pb and Mica ⁴⁰Ar-³⁹Ar Geochronology