东帕米尔及邻区古生界基性火山岩地球化学特征与构造属性

西昆仑山库地、乌依塔格地区的超铁镁质岩及基性火山岩的岩石化学、微量元素、稀土元素特征表明：在震旦－早古生代时期塔里木板块南部的被动陆缘上存在一个扩张规模有限的边缘海洋盆;而在喀喇昆仑山南带的明铁盖地区下二叠统的深海相的硅质岩、纹泥岩、滑塌堆积物及基性火山岩岩石化学、微量、稀元素特征表明,是属于塔里木板块南部活动大陆边缘上的弧后盆地,陆壳的增生是以软碰撞的方式实现的。

GEOCHEMISTRY AND TECTONIC AFFINITIES OF BASIC VOLCANIC ROCKS OF THE PALEOZOIC IN KARAKORUM AREA

The petrochemistry, trace elements and rare earth elements of the ultramafic rocks and basic volcanic rocks of Sinian to early Paleozoic age in Kuda and Uytag areas of the northern Karakoruam mountains indicate the existence of a limited marginal marine basin on the passive continental margin of Tarim plate. The presence of abyssal siliceous rocks, laminated mudstones and olistostromes of the Lower Permian in Mintiegai area of the southern Karakorum as well as the petrochemistry, trace elements and rare earth elements of the basic volcanic rocks indicate the existence of a back-arc basin on the active southern continental margin of Tarim plate. The accretion of the continental crust was completed by "soft" collision.