云南白秧坪东矿区控矿断裂带构造岩的方解石组构  

Calcite fabric of tectonite in an ore-controlling fault belt in the Baiyangping east ore district, Yunnan

作　　者：余凤鸣[1] 何龙清[2] 陈开旭[2] 

机构地区：[1]中国地质大学,湖北武汉430074 [2]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《中国地质》2007年第6期1130-1140,共11页Geology in China

基　　金：原地质矿产部定向基金项目(地科定98-13)资助。

摘　　要：断裂带构造岩的方解石组构综合分析,可以推断构造活动的应力场方位,利用e双晶的C—T(C—压应力轴,T—张应力轴)图解推断古应力的方位,已为众多的地质学家在实践中引用。云南白秧坪东矿区推覆构造的华昌山断裂带和水磨房断裂带,是矿区的主要控矿构造,其构造岩的方解石及e双晶极点组构均显示点极密加环带的型式,大部分发育近岩组坐标c轴的光轴极密,代表光轴方向的压力导致沿岩组坐标ab面滑动;在C—T应力系统中,显示华昌山、水磨房断裂带晚期较强烈活动的应力场方位,主压应力方向为SE-NW向,主张应力方向为NE-SW向,断层以左旋运动为主;华昌山断裂带SE盘往NW方向逆冲,水磨房断裂带则由NW往SE方向反冲,与野外宏观构造分析吻合。We may deduce the stress field orientation in the fault belt by an integrated analysis of the calcite petrofabric in tectonite of a fault belt and deduce the orientation of the paleostress using the C （compressive）-T （tensile） stress diagram of calcite with e-twins. The methods have been applied by many geologists in the practice. In the Baiyangping east ore district of Yunnan, the Huachangshan and Shuimofang faults are the principal ore- controlling structures. The petrofabric diagrams of calcite optic axis and e-twin poles both show c-axis pole maxima and girdles, indicating that the compressive stress in the c-axis direction causes gliding along the ab plane. In the C-T stress system, the principal compressive stress is oriented in a SE-NW direction and the principal tensile stress is oriented in a NE-SW direction, and the sinistral motion predominates for the Huachangshan and Shuimofang faults; the SE block of the Huachangshan fault is thrust in a NW direction, while the Shulmofang fault is thrust antithetically from NW to SE. These coincide with the macroscopic structural analysis in the field.

关 键 词：白秧坪东矿区 控矿断裂带 方解石组构 C—T图 应力场方位 

分 类 号：P313[天文地球—固体地球物理学]