Characteristics of Kuqa and Northern Tarim Foreland Basins and Their Coupling Relation to South Tianshan orogeny

Abstract

Abstract: A fully developed conti nent-continent colision orogeny can often form dual foreland basin. Kuqa and northern Tarim foreland basins constitute the dual foreland basin of south Tianshan orogeny. The former is a protoforeland basin formed during Mesozoic continent-continent collision of south Tianshan, and the latter is a neo-foreland basin formed during Cenozoic large-scale intracontinental overthrust of South Tianshan. Kuqa foreland basin was strongly deformed during the consequent orogenesis. Its wedge depozone and possibly part of foredeep depozone had been involved into the consequent orogenises. Northern Tarim foreland basin is an integrated foreland basin with all the depozones. The ancient south Tianshan oceanic basin w as completely closed by the end of Permian(probably earlier at the east part). Yili-Central Tianshan block and Tarim continent were fully collided. And Kuqa foreland basin was formed during this collision. The remote effect of Cenozoic Himalayan orogeny made south Tianshan orogenic belt reactive, emerging intracontinental orogeny. Northern Tarim foreland basin was formed during this intracontinental orogeny.

Key words: Tarim basin, Kuqa, foreland, southern Ti anshan fold zone, land collision, thrust nappe

CLC Number:

TE111.1

LI Yue-jun, SONG Wen-jie, MAI Guang-rong, ZHOU Li-xia, HU Jian-feng, SHANG Xin-lu. Characteristics of Kuqa and Northern Tarim Foreland Basins and Their Coupling Relation to South Tianshan orogeny[J]. Xinjiang Petroleum Geology, 2001, 22(5): 376-381.

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