柴达木盆地北缘新生代右行走滑冲断构造带的几何学和运动学
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摘要
通过露头地质调查、地震剖面解释和地层残余厚度图的分析,发现柴达木盆地北缘新生代以右行走滑冲断构造变形为主.走滑冲断构造带内的断层在平面上呈分支复合,剖面上表现为花状构造,走滑逆冲断层上、下盘地层呈不协调产出.右行走滑冲断构造带形成的应力来源于阿尔金断裂左行走滑的拖拽力作用以及北东-南西和北西-南东向的简单剪切应力作用
Through field geological survey, interpretation of seismic profiles and analysis of map of relict stratum thickness, it was discovered that the deformation in the north margin of the Qaidam Basin is mainly right-lateral strike-slip thrust. The faults in the strike-slip thrust structural belts are branch or compound in plane and flower structure in section with strata in the hangingwall and footwall of the faults inconsistent. The formation of the Cenozoic right-lateral strike slip thrust structural belts was derived from the dragging stress produced by the activity of sinistral Altyn Tagh fault and the simple shear stress of northeast and northwest direction produced by the collision between Indian plate and Eurasian plate.
Through field geological survey, interpretation of seismic profiles and analysis of map of relict stratum thickness, it was discovered that the deformation in the north margin of the Qaidam Basin is mainly right-lateral strike-slip thrust. The faults in the strike-slip thrust structural belts are branch or compound in plane and flower structure in section with strata in the hangingwall and footwall of the faults inconsistent. The formation of the Cenozoic right-lateral strike slip thrust structural belts was derived from the dragging stress produced by the activity of sinistral Altyn Tagh fault and the simple shear stress of northeast and northwest direction produced by the collision between Indian plate and Eurasian plate.
引文
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[2] 邢成起,张杰,吕德徽.关于阿尔金北缘活动断裂带运动方式的转变机制的讨论[J].西北地震学报,1998,20(2):52-57.XING Cheng- qi,ZHANG Jie,LU¨De- hui.Discussionon change and its mechanism of movem ent forms ofthe active fault zone along the north m argin ofAltun[J].NorthwesternSeism ologicalJ,1998,20(2):52-57.
[3] 车自成,孙勇.阿尔金麻粒岩相杂岩的时代及塔里木盆地的基底[J].中国区域地质,1996,1:51-57.CHE Zi- cheng,SU N Yong.The age of theAltungranulite facies complex and the basem ent of theTarimBasin[J].RegionalGeology ofChina,1996,1:51-57.
[4] 崔军文,唐哲民,邓晋福,等.阿尔金断裂系[M].北京:地质出版社,1999.39-49.CUN Jun- wen,TANG Zhe- min,DENG Jin- fu,et al.FaultSystems of theAltynTagh[M].Beijing:GeologicalPublishingHouse,1999.39-49.
[5] 张建新,许志琴,杨经绥,等.阿尔金西段榴辉岩岩石学、地球化学和同位素年代学研究及其构造意义[J].地质学报,2001,75(2):186-197.ZHANG Jian- xin,XU Zhi- qin,YANG Jing- sui,etal.Petrology,geochem istry and geochronology ofEclogites from the western segment of theAltynTagh tectonic belt,NorthwesternChina[J].ActaGelogicaSinica,2001,75(2):186-197.
[6] 狄恒恕,王松贵.柴达木盆地北缘中、新生代构造演化探讨[J].地球科学:中国地质大学学报,1991,16(5):533-539.DI Heng- shu,WANG Song- gui.The study of theevolution of theMesozoic andCenozoic structuress inthe northeast m argin of theQaidamBasin[J].EarthScience:J ofChinaUniversity ofGeosciences,1991,16(5):533-539.
[7] 胡受权,曹运江,黄继祥,等.柴达木盆地北缘地区前陆盆地演化及油气勘探目标[J].天然气工业,1999,19(4):1-5.HU Shou- quan,CAO Yun- jiang,HU ANG Ji- xiang,et al.Evolution of foreland basin and the aim ofhydro- carbon exploration in the north m argin of theQaidamBasin[J].Industry ofNaturalGas,1999,19(4):1-5.
[8] 葛肖虹.对中国西北部找油的思考[J].勘探家,1997,2(3):53-56.GE Xiao- hong.The idea of about searching forhydro- carbon in theNorthwesternChina[J].PetroleumExplorationist,1997,2(3):53-56.
[9] 汤良杰,金之钧,戴俊生,等.柴达木盆地及相邻造山带区域断裂系统[J].地球科学:中国地质大学学报,2002,27(6):676-682.TANG L iang- jie,JIN Zhi- jun,DAI Jun- sheng,etal.Regional fault system s of theQaidamBasin andadjacent orogenic belts[J].EarthScience:J ofChinaUniversity ofGeosciences,2002,27(6):676-682.
[10] MOlNAR P,BURCHFIEL B C,ZHAO Z,et al.Geom orphic evidence for active faulting in theAltynTagh and northernTibet and qualitative estim atesof its contribution to the convergence ofIndia andEurasia[J].Geology,1987,15:249-453.
[11] 虢顺民,向宏发.阿尔金构造体系渐新世-中新世以来断裂左旋位错时空分布规律研究[J].地震地质,1998,20(1):9-17.GUO Shun- min,XIANG Hong- fa.A study onspatial- temporal distribution of the fault sinistraldisplacement in theAltynTagh structure systemsinceOligocene-Miocene[J].Seismology andGeology,1998,20(1):9-17.
[12] 张岳桥,陈正乐,杨农,等.阿尔金断裂晚新生代左旋走滑位错的地质新证据[J].现代地质:中国地质大学研究生院学报,2001,15(1):8-12.ZHANG Yue- qiao,CHEN Zheng- le,YANG Nong,et al.New geological evidence for lateCenozoic left-lateral displacem ent along theAltynTagh fault[J].ModernGeology:J ofGraduateSchool,ChinaUnivesity ofGeosciences,2001,15(1):8-12
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