摘要
本文通过断裂带构造形迹和结构面力学性质分析、节理统计以及定向薄片显微分析,采用岩组分析法和石英变形纹费氏台测量,测得成矿前期i应力σ_1的产状为NE45°±5°,侧伏角为40°±5°;成矿期主压应力为NW70°±5°,侧伏角35°±5°;成矿期后主压应力转变为SE20°左右,侧伏角约45°。研究表明,成矿期NW向断裂具张扭性。
Based on the study of structural feature of fracture zone, the analysis of me-chanical characteristics of structure plane, statistics of joints and the analysis of oriented sample microstructure, with petrofabric analysis and survey of deformation lamelle, it can be determined that the occurrence of the main stress (σ1) in preme-tallogenic stage is NE45°±5°, plunge angle is 40°±5°;The occurrence of the main stress is NW70°±5° in metallogenic stage, plunge angle is 35°±5°; but in post - me -tallogenic stage, the occurrence of main stress is transformed into NW20°±5°, plunge angle is 45° or so.
It shows that north-west faults have tensional-shear properties in metallogenic stage which are the best ore-bearing structures.
出处
《矿产与地质》
1990年第4期21-26,共6页
Mineral Resources and Geology
