潘家伟1,2 李海兵1,2 孙知明3 斐军令3 司家亮1,2 Laurie Barrier4 Jerome Van Der Woerd3 邱祝礼1,2 吴富峣1,2 张丽军6
1.国土资源部大陆动力学重点实验室北京 100037； 2.中国地质科学院地质研究所北京 100037； 3.中国地质科学院地质力学研究所北京 100081； 4. Laboratoire de Tectonique, Institut de Physique du Globe de Paris, Paris, France 75252； 5. Institut de Physique du Globe de Strasbourg, Strasbourg, France 67084； 6.河北工程技术高等专科学校水利系河北沧州 061001
Deformation features of the Mazartagh fold-thrust belt,south central Tarim Basin and its tectonic significances
Pan Jiawei1,2 Li Haibing1,2 Sun Zhiming3 Pei Junling3 Si Jialiang1,2 Laurie Barrier4 Jerome Van Der Woerd5 Qiu Zhuli1,2 Wu Fuyao1,2 Zhang Lijun6
1.Key Laboratory for Continental Dynamics, Ministry of Land and Resources, Beijing 100037;2.Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037;3.Institute of Geomechanics,Chinese Academy of Geological Sciences, Beijing 100081;4.Laboratoire de Tectonique, Institut de Physique du Globe de Paris, Paris, France 75252;5.Institut de physique du Globe de Strasbourg, Strashourg,France 67084;6.Department of Water Conservancy, Hebei Engineering and Technical College, Cangzhou Hebei 061001
Study on stratum，geomorphology，and tectonic deformation in Mazartagh area is significant for understand questions such as the Cenozoic tectonic evolution of the Tarim Basin，the relationship between Tarim Basin and west Kunlun Mountain，the influence of neotectonic activities on the redistribution of oilgas resources，and changing of climate and environment in Taklimakan desertLate Cenozoic structural features in this area were studied thoroughly based on interpretation of satellite images，observation of field deformation，surveying of geological section，and interpretation of geophysical dataThe tectonic orientation, time of origin, uplift rate and shortening rate, and stretch of the Mazartagh foldthrust belt was also discussed hereThe main conclusions are as bellow： 1)Based on the analysis of regional geomorphology，surface deformation，and geophysical data，the Mazartagh foldthrust belt was considered to be the frontier of the foreland foldthrust belts of the west Kunlun MountainThe Hetian River gas field，which located in the crest of the frontier thrust belt，was formed under the promotion of the Late Cenozoic tectonic deformation，which reform the tectonics of the Paleozoic and Mesozoic in the southern and central Tarim Basin； 2)The Mazartagh Mountain had experienced two tectonic uplift events，which were at the end of Miocene(about 7 Ma)and from MiddlePleistocene(about 780 ka BP.)respectivelyThe late one caused the formation of Mazartagh foldthrust belt and present geomorphology of Mazartagh Mountain； 3)Uplift rate and shortening rate of Mazartagh foldthrust belt since middle Pleistocene were estimated to be 0.26～0.4 mm/a and 0.9 mm/a respectively； 4)The Mazartagh foldthrust belt should be linked to Kashi Anticline，which is also the frontier of the foreland foldthrust belt of the west Kunlun Mountain，to the westThere might be a strike slip fault in the eastern end of the Mazartagh Mountain，near the Hetian Rive，which strike in a NESW direction and cause the disappear of the Mazartagh Mountain to the east.