JURASSIC DEFORMATION AT THE WESTERN MARGIN OF THE EAST ASIA CONTINENT: A CASE STUDY OF DUCTILE DEFORMATION IN THE CENTRAL SEGMENT OF THE BANGONG CO-NUJIANG BELT

SHI Wei; DONG Shuwen; HUANG Xingfu; CHEN Hong; CUI Jianjun

2017 Vol. 23, No. 4

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SHI Wei, DONG Shuwen, HUANG Xingfu, CHEN Hong, CUI Jianjun. JURASSIC DEFORMATION AT THE WESTERN MARGIN OF THE EAST ASIA CONTINENT: A CASE STUDY OF DUCTILE DEFORMATION IN THE CENTRAL SEGMENT OF THE BANGONG CO-NUJIANG BELT[J]. Journal of Geomechanics, 2017, 23(4): 515-525.

Citation:

JURASSIC DEFORMATION AT THE WESTERN MARGIN OF THE EAST ASIA CONTINENT: A CASE STUDY OF DUCTILE DEFORMATION IN THE CENTRAL SEGMENT OF THE BANGONG CO-NUJIANG BELT

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China

Received Date: 06 March 2017

Publish Date: 25 August 2017

Abstract

Abstract

The Bangong Co-Nujiang belt resulted from the convergence and collision between the Chiangtang and Lhasa blocks in late Mesozoic. The key issue in this tectonic study is when and how the belt was formed. With the Ando-Nyainrong block of the central segment of the Bangong Co-Nujiang belt as the study area, the ductile shear belts with approximately E-W strike developed in the internal basement of the block are studied based on ductile shear deformation analysis and syntectonic geochronology. The foliation and lineation measurement and analysis of the shear belts indicate tectonic compression with NE-SW strike. Through the test analysis of ⁴⁰Ar/³⁹Ar in syntectonic minerals, the age is worked out as 167 Ma. All the evidence shows that the central segment of the Bangong Co-Nujiang belt was caused under the convergence and collision between the Chiangtang and Lhasa blocks in the middle of Middle Jurassic, which provides direct tectonic evidence for the Jurassic deformation at the western margin of the East Asian continent.
- East Asia continent /
- Bangong Co-Nujiang belt /
- Ando-Nyainrong block /
- ductile shear deformation /
- Jurassic

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