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通过精细的地震资料解释,在塔里木盆地中部的满西地区发现晚志留世一石炭纪伸展构造。伸展构造由一系列规模不大的正断层组成,平面上组成两条北东—南西向的左行雁列状正断层带;剖面上构成负花状构造和堑垒构造。根据生长系数计算结果,正断层形成于晚志留世,在泥盆纪和石炭纪持续活动,于石炭纪末停止活动。正断层活动的高峰期为晚志留世。该期伸展构造在塔中和塔北地区也有发育,反映当时塔里木盆地处于区域性伸展构造背景。塔里木盆地晚志留世—石炭纪的伸展构造,是昆仑早古生代晚期(晚奥陶世—中志留世)碰撞造山后构造应力松弛作用的产物。
Through elaborate seismic data interpretation, late Silurian-Carboniferous extensional structures were found in Manchuria in the central part of the Tarim Basin. The extensional structure is composed of a series of small-sized normal faults that consist of two NE-NWW left-banded geese and normal fault zones in the plane, and the negative flower-like structures and the cutting-wall structures are formed in the profile. According to the calculation results of growth coefficients, the normal faults formed in Late Silurian and remained active in Devonian and Carboniferous, and stopped in the end of Carboniferous. The peak of normal fault activity is Late Silurian. The extensional structure also developed in Tazhong and Tabei areas, reflecting the regional tectonic setting of the Tarim Basin at that time. The Late Silurian-Carboniferous extensional structure in the Tarim Basin is the result of tectonic stress relaxation after the collision of the orogeny (Late Ordovician-Middle Silurian) in the early Paleozoic Kunlun basin.