The Tectonic Feature of a Quasi-Trij unction in the Northeastern Corner of Qinghai-Xizang Plateau |
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| Authors: | Tian Qinjian and Ding GuoyuCenter for Analysis and Prediction CSB Beijing China |
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| Institution: | Tian Qinjian and Ding GuoyuCenter for Analysis and Prediction,CSB,Beijing 100036,China |
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| Abstract: | Quasi-trijunction is a type of popular structure for certain scale tectonic blocks in a continent. There are two kinds of quasi-trijunction in the conjoining area formed due to rotation of continental blocks. They are the clockwise type and the anticlockwise type of quasi-trij unction. The shape of a quasi-trij unction may be gradually changed associated with block rotation and tectonic evolution, but, sediments and structure in the conjoining area can record the history of tectonic evolution. Thus, studying a quasi-trij unction can reveal regional tectonic evolution.Regional tectonic movement, plane strain partitioning and characteristics of seismic activity can be studied based on kinematics and geometric analysis of a quasi-trijunction.The quasi-trijunction is a surface structure controlled by deep crustal movement. Tectonic activity may be different in three branches. In the quasi-trijunction in the northeastern corner of Qinghai-Xizang Plateau, the NWW-trending Qilianshan-Hexi corridor fault zone with left-lateral and compressional movement and the NNE-trending east margin fault zone of Qinghai-Xizang Plateau with right lateral movement have a deep crustal tectonic background. However, the Liupanshan tectonic zone has deviated from the deep zone. |
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| Keywords: | Quasi-trijunction Tectonic deformation Qinghai-Xizang Plateau |
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