Neogene deformation of the Kuqa-Tianshan Basin-range System  

作　　者：WANG Qingchen1, ZHANG Zhongpei1, LIN Wei1, SONG Wenjie2 & GUO Hong2 1. Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. Tarim Petroleum Company, CNPC, Korla 841000, China 

出　　处：《Science China Earth Sciences》2004年第z2期53-65,共13页中国科学（地球科学英文版）

摘　　要：The Neogene deformation of the Kuqa-Tianshan Basin-range System is character-ized by discrepancy in paleostress patterns on the basin-range boundary and in the basin interior, and by discrepancy in deformation styles of the basement and the cover. Measurement and paleostress reconstruction of the brittle faults display a stress pattern with NW-SE and/or NNW-SSE extension on the basin margin and NW-SE compression in the basin interior. The basement was cut into blocks separated by boundary faults and upthrusts that were recognized in the seismic reflection profile. The block-faulting could have caused vertical uplift of the basement and gravitational sliding in the overlying sedimentary cover. Theoretical calculation indicates two generations of potential decollement folds within the basin, with one being mudstone in the Triassic Huangshanjie formation and the other the Cenozoic salt-gypsum layers.The Neogene deformation of the Kuqa-Tianshan Basin-range System is character-ized by discrepancy in paleostress patterns on the basin-range boundary and in the basin interior, and by discrepancy in deformation styles of the basement and the cover. Measurement and paleostress reconstruction of the brittle faults display a stress pattern with NW-SE and/or NNW-SSE extension on the basin margin and NW-SE compression in the basin interior. The basement was cut into blocks separated by boundary faults and upthrusts that were recognized in the seismic reflection profile. The block-faulting could have caused vertical uplift of the basement and gravitational sliding in the overlying sedimentary cover. Theoretical calculation indicates two generations of potential decollement folds within the basin, with one being mudstone in the Triassic Huangshanjie formation and the other the Cenozoic salt-gypsum layers.

关 键 词：KUQA basin  TIANSHAN Mountains  Neogene  paleostress  GRAVITATIONAL slide. 

分 类 号：P542[天文地球—构造地质学]