【摘要】 文章统计分析了金川矿区内地层和侵入体中的节理构造,对矿区内的共轭剪节理进行配套、分期,综合区域构造演化史后分析了矿区构造应力场。研究表明,金川矿区从新太古代到古生代至少受到4期古构造应力的作用。第一期构造应力场为NS向的挤压,由阴山陆块与鄂尔多斯陆块碰撞形成华北古陆西部陆块引起。第二期构造应力场为NE-SW向的挤压,与华北克拉通东、西陆块碰撞拼合并参与Columbia超大陆拼合事件有关;其后阿拉善陆块与华南陆块参与Rodinia超大陆拼合事件,应力场持续作用。第三期构造应力场为近NS向的挤压,由祁连洋不断向北俯冲引起。第四期构造应力场为NNE-SSW向的挤压,与祁连造山带发生的强烈造山运动有关。更多还原

【Abstract】 This paper makes statistics and analysis of joints in strata and intrusions in Jinchuan mining district.The conjugate shear joints are fit in sets and staged then the structural stress field is analyzed combined with the regional tectonic evolution history.From Neo-Archean to palaeozoic era here is at leas`t exposed to four phases of palaeo-tectonic stress.The first one is NS compression caused by the Yinshan block and Ordos block collision with formation of western block of the palaeo-north China continent.The second one is NE-SW compression caused by the collage of the eastern and western blocks of the north China craton and the involvement in collage of the Columbia supercontinent.Then Alashan block and the southern China block participated in Rodinia supercontinent collage and the stress field continues to play role.The third phase of tectonic stress field is near NS compression caused by continuously northward subduction of the Qilian ocean.The last is NNE-SSW compression related to the strong orogenesis in the Qilian orogenic belt.更多还原