广西凤凰山银矿区构造特征及构造应力场、应变场分析

广西凤凰山银矿位于广西西大明山复式背斜北部次级小明山背斜北翼内近东西走向的断理解破碎带中。矿区构造以断裂为主，褶皱不发育，断层以WNW－EW向、NW向两组为主，其次为NE向，偶见SN向。矿区内节理发育，按走向可分为6组，矿区曾经历了加里东运动和海西－印支运动两次SN向挤压、印支－－燕山运动NW－SE向挤压、喜马拉雅运动NE－SW向挤压和近EW向挤压作用。

STRUCTURAL FEATURES, STRESS FIELDS AND STRAIN FIELDS IN FENGHUANGSHAN SILVER MINE AREA, GUANGXI, CHINA

Fenghuangshan silver deposit is located in a fault zone which occures along the nortern limb of Xiomingshan fold belonging to Damingshan anticlinoyinm. In the mine area, faults are dominant structures in comparsion with folds and there are three group of faults, WNW-ESE or EW, NE-SW and SN-oriented, among which the first group are the most important and the third group are rare. Joints numerously occurred and can be divided into six groups according to their trends. The area underwent complicated deformation events, which are: (1)NS-oriented compressions in Caledonian and Hercynian(perhaps Indo-China) movement; (2) NW-SE-oriented compression in Yanshan ( perhaps Indo-China) movement and;(3)nearly EW and NE-SN oriented compression in Himalaya movement.