辽东半岛南部印支造山旋回早期的顺层滑脱构造  

BEDDING DECOLLEMENT STRUCTURE OF THE EARLY INDOSINIAN OROGENIC CYCLE IN THE SOUTH OF LIAODONG PENINSULA

作　　者：陈荣度 李显东 杨雅君 战丽华 单学东 张福生 

机构地区：[1]辽宁地质勘查院,辽宁大连116100

出　　处：《辽宁地质》1999年第3期161-169,共9页

摘　　要：辽东半岛南部发育于太古宙基底与青白口系盖层邻接部位的大型韧性剪切带与盖层内顺层固态流变形成的构造群体，是印支造山旋回开始时，在主要来自太平洋方面的构造力驱动下，以盖层与基底的不整合面为主滑脱面发生自东向西近水平多层系顺层剪切滑脱的产物， 称顺层滑脱构造。大范围的顺层滑脱未引起大规模的褶皱—逆冲推覆；同时，主滑脱面也不同于伸展拆离断层。顺层滑脱构造形成后先后被南北向（Ｔ３ —Ｊ１） 和东西向（Ｊ２ —Ｊ３） 等褶皱断裂系叠加改造；基底在晚白垩世的断块运动中大幅度抬升。顺层滑脱构造应该是长期沉降的沉积盆地在进入造山旋回时（ 主褶皱前） 可能出现的构造型式。There is a large scale ductile shear zone between the Archean basement and sedimentary covering of Qingbaikou system , and a bedding solid state rheid tectonic group in the sedimentary covering in the south of Liaodong Peninsula,are renamed bedding decollements structure in the pa per. They were considered to be the results of multi bed system occuring near horizintal bedding shear decollement from Eto W along the major decollement plane, which was unconformity surface between the basement and the cover, driven by the tectonic stress from Pacific plate movement.The large scale bedding decollement didn' t cause fold thrust napping; meanwhile,the major decollement plane is different from a extensional detachment fault too .After formation of the bedding decolle ments,fold fracture system was surposed and deformed by S Nlongitudinal(T1 -J3) and E W latitu dinal(J2 - J3) etc.,and during the block movement of Late Cretaceous,the basement was strongly u plifted. The bedding decollement must be a tectonic model when the secularly sinking sedimentary basin entered orogenic cycle .

关 键 词：辽东半岛 印支旋回 顺层滑脱构造 韧性剪切带 

分 类 号：P542.3[天文地球—构造地质学]