摘要
双王金矿含金角砾岩为水力压裂成因角砾岩。认为该水压角砾岩体是深源富碱含金流体在泥盆系一套热水沉积的富钠质岩系中发生水力压裂作用形成的。早期共轴递进挤压使能干性的富钠质岩系与非能干性的富泥质岩系发生构造透镜石香肠化 ;晚期的非共轴递进剪切使早期在透镜体中心形成的构造裂隙由剪性转化为张性 ,并产生巨大的压力降使深部的流体在富钠质岩系中沿裂隙发生水力压裂作用 。
Gold-hosted breccia in Shuangwang ore deposit is hydrofracturing breccia. The hydrofracturing breccia is formed by deep rich-sodic and gold-hosted fluid hydrofracturing in a set of Devonian system hot-water sedimentary rich-sodic rocks. The early coaxial progressive depressing makes the forming of tectonic lens in the competent rich-sodic and incompetent rich-mud rocks ; the later nocoaxial progressive shearing makes the tectonic compression fracture into extension fracture in the early tectonic lens, at the same time, the great drop of pressure leads to the hydrofractureing of deep fluid along the fracture in the rich-sodic rocks, and then produces the hydrofracturing breccia.
出处
《西北地质》
CAS
CSCD
2002年第1期60-64,共5页
Northwestern Geology
基金
国家自然科学基金项目 (编号 4 9772 15 2 )
太白金矿找矿项目联合资助
关键词
水压角砾岩
地质特征
地质证据
水力压裂成因
双王
hydrofracturing breccia
geological features
geological envidence
hydrof-racturing genesis
Shuangwang
