文档介绍：康定长岩窝金矿矿床成因分析
作者姓名: 专业班级指导教师:
摘要
四川省甘孜藏族自治州康定县长岩窝金矿是该县的一处小型金矿床,有着三个矿区狮子岩、长岩窝、双牛棚。该矿床属于石英脉型金矿床,矿石主要赋存于石英脉中,大致为东西走向,受断裂构造的控制;矿区位于扬子准地台和松潘-甘孜地槽褶皱系两个Ⅰ级大地构造单元的接合部、道孚-康定三岔裂谷系的中心,也是南北向安宁河深断裂、北西向鲜水河深断裂、北东向茂汶深断裂和北川-映秀深断裂四大断裂带的交汇处。矿区出露于“康定杂岩”西缘的志留系沉积盖层中。矿床产于晚太古-晚元古界变质岩系中,其中常有不同时代的花岗岩侵入,最重要的是中生代燕山期花岗岩类。岩石中含水矿物及碳酸盐岩等发生去水脱碳形成流体并与大气降水混合形成高温流体, 沿剪切带运移, 并从围岩中卒取Au, Sb, As, Bi, S 等成矿物质, 形成含金的成矿流体;使矿区内金等成矿元素在动力、热力和韧性剪切构造作用下发生活化、迁移和初步富集成矿;在以后的围岩蚀变作用下,围岩中的金被进一步卒取、活化、迁移和富集;由于温度与压力的极聚降低, 含金成矿流体中的金开始在剪切带中的有利构造部位沉淀、富集成矿。最终形成中低温热液多金属硫化物型金矿床。
关键词:石英脉型金矿床康定杂岩多金属硫化物
The genesis analysis of gold at Changyanwo in Kangding county
Abstract
The genesis of Changyanwo is a Small-scale gold deposit at Kangding County, Ganzi Tibetan Autonomous Prefecture in Sichuan Province,there are three Mining areas ,Shiziyan Changyanwo and shuangniupeng. The deposit is a quartz vein-type gold deposits, the ore mainly occurs in quartz veins,it roughly the east-west,it is controlled by faults; The mine is located in two tectonic units of grade Ⅰ a juncture is the Yangtze platform and the quasi-Songpan - Ganzi geosyncline fold system, the center of the Daofu - Kangding trigeminal rift system, the NS at Anling River deep fracture,NW at Xianshuihe deep fracture,NE at Maowen deep fracture and the Beichuang -- Yingxiu deep fracture,so The mine is located in the intersection of the four faults. The mine is exposed in the sedimentary cover layer of silurian-carboniferous in the western "Kangding Melange ".Deposits are occured in the late Archean - late Proterozoic metamorphic rocks, Which are frequently invaded by granites of different ages, The granitoids in Yanshan of the Mesozoic is the most important. The water-bearing minerals and carbonate rocks in rocks are occurred dehydration and decarbonization form fluids with the mixture meteoric water formed the high-temperature fluid. movemented by shear zone, and jailer took the Ore-forming materials as Au, Sb, As, Bi, S and so on from the surrounding rock, formed ore