中国西部和印支半岛的构造格局

• 作 者: 乐光禹
• 出 处: 地质论评
• 发表日期: 1983年05期
• 关键词: 弧形构造带 构造格局 网眼 主应力方向 网络控制 共轭 印支 地块 形成机理 应力场

一、菱形地块和弧形构造带的形成机理:菱形地块和弧形构造带都受共轭剪切网络控制。垂直于共轭断裂边界的两对水平压力联合作用,产生非均匀叠加应力场,主应力方向渐变,形成反凸双弧,中央变形弱的部分即为菱形地块。二、中国西部的构造格局——东西向网眼状弧系:一系列菱形地块和弧形构造带相间排列,沿东西向延伸,组成复杂的网眼状弧系。弧系的西端在帕米

First, the formation of diamond-shaped block and the arc structure of the formation mechanism: diamond-shaped blocks and arc structure are controlled by the conjugate shear network. The combination of two pairs of horizontal pressures perpendicular to the conjugate fracture boundary produces a nonuniform superimposed stress field with a gradual change in the direction of principal stress to form an anti-convex double-arc. The weak part of the center is a diamond-shaped block. Second, the structure of western China - east-west network of arcuate arc: a series of diamond-shaped blocks and arcuate tectonic belt arranged with each other, extending along the east-west, composed of complex mesh-like arc. The western end of the arc is in Pamir