河台金矿床成矿构造类型及成矿规律探讨.pdf

分类号: P54 密级: 编号:102011036 桂林理工大学硕士研究生学位论文河台金矿床成矿构造类型及成矿规律探讨专业:构造地质学研究方向:成矿构造与动力成矿研究生:王方里指导教师:汪劲草教授论文起止日期:2012年6月至2014年4月万方数据 Analysis ofMetallotectonical Types and MetallogenicRegularity of Gold Depositsin Hetai Major: Structural Geology Direction of Study:Metallogenic Structural And Power Mineralization Graduate Student:Wang Fangli Supervisor: Jincao College of Earth Science Guilin University of Technology June,2012 to April,2014 万方数据万方数据桂林理工大学硕士学位论文 I 摘要河台金矿床受控于粤西深层次逆冲推覆型韧性剪切带前缘陡坡带,其高村金矿床与云西金矿床分别受控于陡坡带分支糜棱岩带中,分支糜棱岩带在剖面上呈铲式,在平面上呈雁列分布。河台金矿的一级控矿构造为粤西大型逆冲推覆型韧性剪切带;二级控矿构造为河台推覆型韧性剪切带分支糜棱岩带;三级控矿构造为剪切带处于不同构造层次发育的一系列破裂构造. 河台金矿为多阶段多次富集成矿。从早期韧性阶段、中期脆-韧性阶段到晚期脆性阶段均可成矿,早期韧性剪切阶段形成细脉浸染型金矿体(特富矿体), 中期脆-韧性阶段形成石英脉型金矿体,晚期脆性阶段形成蚀变糜棱岩型金矿体。根据韧性剪切带动力学特征,控制高村矿床与云西金矿床的分支韧性剪切带在平面上具有右行排列规律,结合矿体的侧伏规律所指示的动力学特征,认为在北东方向的分支韧性剪切带深部存在隐伏的金矿体,其与高村、云西金矿床呈雁列分布;而在已知矿床深部,根据破裂沿动力方向的张剪-压剪转换规律,认为在高村与云西已知金矿体的下部经过一个无矿的“天窗”后,会在深部再次出现由张剪破裂控制的隐伏金矿体。关键词:河台韧性剪切带;成矿构造类型;成矿规律;河台金矿床万方数据桂林理工大学硕士学位论文 II Abstract The Hetai gold depositsis controlled by the acric region of the deep-level thrust nappe type ductile shear zone in Western Guangdong. Of these deposits, both the Gaocun gold deposit and the Yunxi deposit were formed in multi-branch mylonite zone of actic region, Which show shovel shape in the cross seismic profiles, and is horizontally distributed as an echelon arrangement. Large scale thrust nappe type ductile shear zone in Western Guangdong was the first-grade fracture; the multi-branch mylonite zone of nappe ductile shear zone was the second-grade fracture; the third-grade fractures were a serious fractural structure developing in different structural hierarchy of shear belt. The Hetai gold deposit is the aynthetical result of polystage metallogenesis, including three stages: early ductile stage, mid brittle-ductile stage, late brittle stage. During the early stage, veinlet disseminated type gold ore-body was formed. The