CAJ | 학술논문

通过区域地质和构造地震精细研究,提出了塔里木南缘早古生代板块构造控制塔南-塔中从伸展到挤压盆地演化:寒武纪-早奥陶世板缘拉张控制了塔中北斜坡断陷构造;中奥陶世北昆仑洋盆关闭后塔中前缘隆起;晚奥陶世-晚泥盆世塔中前陆冲断与走滑构造变形.晚奥陶世塔南前陆冲断构造由东南向西北方向传播,形成塘北-塔中南-塔中5号断裂带等弧形断裂体系和塔中低凸起中西段与Ⅰ号断裂带小角度斜交的走滑断裂体系.冲断构造位移的传播受控于两个滑脱层:其一是沿寒武系内部膏盐岩的滑脱,形成弧形冲断构造,终止于塔中南缘断裂带;另一个是沿中地壳韧性变形带的滑脱,形成塔中1号断裂带东端的弧形构造带.塔中1号断裂带东段的构造变形方式主要为向北传播水平位移的断层传播褶皱和向南反向冲断的楔形构造.塔中低凸起的中西段右行走滑构造导致了向东收敛的扫帚状走滑断裂体系的形成,剖面发育花状构造.塔中低凸起的古构造演化与变形特征、构造变形样式、构造变形成因和断裂体系,是克拉通盆地内部叠合盆地深层的主要构造地质特征.
통과구역지질화구조지진정세연구,제출료탑리목남연조고생대판괴구조공제탑남-탑중종신전도제압분지연화:한무기-조오도세판연랍장공제료탑중북사파단함구조;중오도세북곤륜양분관폐후탑중전연륭기;만오도세-만니분세탑중전륙충단여주활구조변형.만오도세탑남전륙충단구조유동남향서북방향전파,형성당북-탑중남-탑중5호단렬대등호형단렬체계화탑중저철기중서단여Ⅰ호단렬대소각도사교적주활단렬체계.충단구조위이적전파수공우량개활탈층:기일시연한무계내부고염암적활탈,형성호형충단구조,종지우탑중남연단렬대;령일개시연중지각인성변형대적활탈,형성탑중1호단렬대동단적호형구조대.탑중1호단렬대동단적구조변형방식주요위향북전파수평위이적단층전파습추화향남반향충단적설형구조.탑중저철기적중서단우행주활구조도치료향동수렴적소추상주활단렬체계적형성,부면발육화상구조.탑중저철기적고구조연화여변형특정、구조변형양식、구조변형성인화단렬체계,시극랍통분지내부첩합분지심층적주요구조지질특정.
After analyzing the regional geology and the seismic interpretation, the writers make conclusions that structural geologic evolution from extension to compression in the Southern-Central Tarim basin during early Paleozoic was controlled by the plate tectonic of southern margin of the Tarim plate. Extension and rift structure occurred in the northern margin of Central Tarim Basin under the control of extension in passive continent margin during Cambrian to Early Ordovician; It was a forebulge in the Central Tarim Basin after closure of the north Kunlun ocean in Middle Ordovician; the thrust nappe and strike deformation from Late Ordovician to Devonian is the main structural features which were kept up to now. The foreland thrust deformation, which propagated from southeast to northwest in Late Ordovician, result in the formation of the arc shaped fault systems of Tangbei fault-south margin fault-No. 5 fault of central Tarim basin and formation of the strik-slip fault system in central-western section of the lower uplift of the central Tarim Basin, which is oblique intersecting with the fault No. 1. The propagation of thrust displace is along two detachment layer. One is the evaporite rocks bed in the Cambrian, the other one is the ductile layer in the middle crust. The main structural style is fault propagation fold and wedge structure in the east segment of fault No. 1. The main style is flower structure of strike faults system which like a broom on the plane distribution in the west segment of fault No. 1. The ancient structural evolution and deformation features, structural style, structure formation cause and the fault system in the Central Tarim Basin are main structural geological features in the depth of superimposition Cratonic basin.