Characteristics of Overthrust in the Eastern Pamir Structural Arc, Western Tibetan Plateau

Abstract

Abstract:

Pamir structural arc is one of the most intensively deformed areas produced by continued compressing of Tibetan Plateau after collision between Indian and Eurasian plates. Geological investigation and interpretation for the seismic section in the eastern Pamir structural arc revealed that thrust nappe was composed of 4 zones from southwest to northeast, i.e, root zone, middle zone, frontal zone and frontal out zone, which are characterized by imbricate thrusting, thrust fold, fault related fold and monoclinal structure, respectively. The study of growth strata of Sugaite and Aketao growth anticlines occured in the frontal zone indicated that the Pamir structural arc was characterized by piggyback imbricated duplex. The deformation time was constrained at Pliocene to Early Pleistocene by growth strata and unconformity. The kinematical mode of thrust nappe was different between eastern and western sections. The thrusting in the west is vertical to extrusion direction, and in the east is oblique and clockwise strickslipe. The stratum shortening in the west was much bigger than that in the east.

Key words: Pamir structural arc, thrust nappe, piggyback, stratum shortening

CLC Number:

P542

SONG Yang, HU Jian-Zhong, WANG Rui-Jiang, LI Rui-Qing, TIAN Bin, LI Shi-Jie. Characteristics of Overthrust in the Eastern Pamir Structural Arc, Western Tibetan Plateau[J]. Geoscience, 2011, 25(1): 15-21.

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Characteristics of Overthrust in the Eastern Pamir Structural Arc, Western Tibetan Plateau

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