Structural characteristics of middle and southern Xainza-Dinggye Normal Fault System and its relationship to Southern Tibetan Detachment System |
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Authors: | Jinjiang Zhang Lei Guo Lin Ding |
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Institution: | (1) Department of Geology, Peking University, 100871 Beijing, China;(2) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China |
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Abstract: | The Xainza-Dinggye Normal Fault System (XDNFS) is a large-scale nearly-north-south trending extensional structure across central
and southern Tibet. Its middle segment developed in Tethys Himalaya with features of earlier magmatic core complex and later
normal faults dipping moderately to northwest-west. The magmatic core complex is made up by mylonitic leucogrante with a low-angle
detachment fault on the top of it and overlain by lower-grade meta-sedimentary rocks. The structural pattern of the southern
segment of XDNFS take the shape of a detachment fault dipping to southeast-east with the High-Himalayan rock series as the
lower plate. The Southern Tibetan Detachment System (STDS) is expressed as a ductile shear zone composed of mylonitic leucogranite
in the studied area of this note. STDS was cut by the later XDNFS, which presents that nearly-east-west striking STDS is not
the controlling or adjusting structure of the nearly-north-south trending extensional structures. The origin of nearly-north-south
trending extensional structures in Tibet may be the result of deform ational partition of north-south compression. |
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Keywords: | Tibetan Plateau extensional structure Xainza-Dinggye Normal Fault System (XDNFS) Southern Tibetan Detachment System (STDS) |
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