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
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摘要: 提要：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。Abstract: Abstract：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 Shuimofang fault is thrust antithetically from NW to SE. These coincide with the macroscopic structural analysis in the field.
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