【摘要】 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。更多还原

【Abstract】 After careful seismic interpretation,Late Silurian-Carboniferous extensional structures were revealed in western Manjiaer Sag,central Tarim Basin.These extensional structures comprise many small normal faults which usually group sinistral en echelon and form 2 tenso-shear normal fault zones.Combinations of the normal faults in profile become negative flower structures and small horst-graben structures.On the basis of growth index calculation,the normal fault formed in Late Silurian,continue active in Devonian and Carboniferous,ceased at the end of Carboniferous.The peak-stage of normal fault activity is Late Silurian.Late SilurianCarboniferous normal fault also developed in Tazhong and Tabei areas,implying that Tarim Basin was under regional extensional tectonic setting in Late Silurian-Carboniferous.The extensional structure is the result of post-orogeny stress relaxation of Kunlun Caledonian orogenic belt.更多还原