The end of ductile shear deformation of Ningshan fault: Constraint from the activity time of Longbozi shear zone

CHEN Chengsheng; LI Wei; WANG Yunpeng; LUO Zhengxian; HUANG Gang

2019 Vol. 38, No. 6

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CHEN Chengsheng, LI Wei, WANG Yunpeng, LUO Zhengxian, HUANG Gang. The end of ductile shear deformation of Ningshan fault: Constraint from the activity time of Longbozi shear zone[J]. Geological Bulletin of China, 2019, 38(6): 993-1005.

Citation:

CHEN Chengsheng, LI Wei, WANG Yunpeng, LUO Zhengxian, HUANG Gang. The end of ductile shear deformation of Ningshan fault: Constraint from the activity time of Longbozi shear zone[J]. Geological Bulletin of China, 2019, 38(6): 993-1005.

The end of ductile shear deformation of Ningshan fault: Constraint from the activity time of Longbozi shear zone

1.
State Key Laboratory of Continental Dynamics, Department of Geology/Northwest University, Xi'an 710069, Shaanxi, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China
3.
University of Chinese Academy of Sciences, Beijing 100039, China
4.
School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

More Information

Corresponding author: LI Wei, liwei@nwu.edu.cn

Received Date: 22 March 2017

Revised Date: 01 June 2017

Publish Date: 15 June 2019

Abstract

Abstract

Three groups of ESR dating ages were obtained from different vein materials in Longbozi shear zone, i.e., 125.6~88.7Ma, 56.7~32.9Ma and 19.8~14.6Ma. The first type of vein materials sampled from schistosities and A-type fold cores marked the end of left-lateral shear deformation. It has been confirmed that the ductile deformation of Ningshan fault began from the early Late Triassic, and might have lasted to Early-Middle Jurassic. However, the result of the first type of vein material ESR dating shows that Ningshan fault left-lateral ductile shear effect lasted to Early Cretaceous. So Early Cretaceous was the critical period when the ductile shear deformation transformed to brittleness in Ningshan shear zone. Furthermore, Ningshan fault experienced Late Triassic-Middle Jurassic rapid-cooling phase, Late Jurassic-Cretaceous slow-cooling phase, and Paleocene-Quaternary rapid-cooling phase. The strain translation that occurred in the late slow-cooling phase suggests that Early Cretaceous also was the critical period of intracontinental deformation mechanism changing.
- Longbozi shear zone /
- Ningshan fault /
- left-lateral shear /
- cleavage /
- A-type fold /
- ESR dating

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References

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