西昆仑早古生代构造演化及其对塔西南盆地的影响

THE WEATERN KUNLUN PALEOZOIC TECTONIC EVOLUTION AND ITS EFFECT ON SW TARIM BASIN

在板块构造理论基础上，通过区内蛇绿岩、与俯冲有关的岩浆岩及相关沉积等综合研究，对西昆仑早古生代构造演化进行了重建：震旦纪－寒武纪西昆仑从塔里木大陆分裂出去，并在它们之间形成“昆仑洋”；寒武纪－奥陶纪“昆仑洋”洋壳向南俯冲于西仑之下，形成库地俯冲带、库地弧前盆地、西昆仑早古生代火山弧及麻扎－黑卡弧后盆地；志留纪－早泥盆世，“昆仑洋”消失，西昆仑早古生代火山弧与塔里木大陆碰撞，并形成塔里木前陆冲断带和泥盆纪前陆盆地磨拉石及塔里木大陆内泥盆纪的“红层相”

Based on the plate tectonic theory ,and studies on the ophiolite and subucted related magmatic complex nad related sedimentary ocks which spread in the study area ,the Early Paleozoic tectonic evolution history of the western Kunlun was reconstructed by the present authors.During Sinian Cambrian,the western Kunlun rifted from Tarim continent and 'Kunlun Ocean'formed between them.During Cambrian Ordovician,the 'Kunlun Ocean'subducted southwar beneath the western Kunoun and generated Kudi suture zone,Kudi forearc basin ,western Kunoun Early pakeozoic magmatic arc,and Maza Heika backarc basin.During Silurian Devonian,'Kunlun Ocean' was all consumed,and in the same time ,the western Kunlun Early Paleozoic magmatic arc collidedwith Tarim continent,then generated foreland thrust belt,Devonian foreland asin and Tarim continent Devonian'red bed' phase.