摘要
内蒙古中部下地壳出露较好，主要以麻粒岩相变质岩石为主，形成于地壳较深层次，华北克拉通北缘出露的下地壳具有较好的可比性，主要由于挤压逆冲作用使下地壳岩石逆冲到一定高度，再经长期剥蚀得以出露。本文对内蒙中部地区出露的下地壳岩石物质组成和变质、变形特征的分析，确定其形成条件为：温度610℃～850℃、压力0．5～1．03GPa、深度18～39km、地热梯度（21～35．4）℃／km。
Lower crust rocks are widely outcropped in the central part of Inner Mongolia. The rocks consist predominately of granulite facies metamorphic rocks. They are formed in the deeper crust. Because the lower crust rocks thrust to a high level by the compression-thrust, and they are exposed to surface after a long degradation; so, they are well comparably in the northern margin of North China Craton. The paper analyzes the material composition and the features of deformation and metamorphic of the lower crust rocks in the central part of Inner Mongolia. They are confirmed by T 610-850℃, P 0. 5-1. 03GPa, 18-39km in depth, geothermal graient 21-35. 4℃/km.
出处
《吉林地质》
2006年第1期1-5,共5页
Jilin Geology
关键词
深部地壳
麻粒岩相
韧性变形
内蒙古中部
deep crust
granulite facies
ductile deformation
central part of Inner Mongolia
