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本文所描述的外来岩块是指在板块俯冲、碰撞的作用下,经过远距离的搬运残留下来的岩石块体。喜马拉雅山北坡外来岩块的主要特点是:多数由二叠纪厚层石灰岩组成,出露于雅鲁藏布缝合线附近和由北往南的运动性质。根据岩性、古生物的特征,它的成因可分为三种类型:俯冲型、仰冲型和挤压型。它们是在印度板块向北移动同欧亚板块俯冲、碰撞过程中,产生下部(印度板块)向北,上部(欧亚板块)往南的一对水平空间力偶的作用而形成的。
The alluvial rock described in this article refers to the rock blocks that have remained after long-distance transportation due to subduction and collision of plates. The main features of the alluvial rocks on the northern slope of the Himalayas are that most of them are composed of Permian thick limestone exposed in the vicinity of the Yarlung Zangbu suture and from north to south. According to the characteristics of lithology and paleontology, its genesis can be divided into three types: subduction type, supine type and extrusion type. They are formed when the Indian plate moves northward and subducts Eurasian plate and collides with a couple of horizontal horizontal forces that cause the lower part (Indian plate) to the north and the upper part (Eurasian plate) to the south.