贵州安龙戈塘地区含金隐爆角砾岩筒地质特征及意义  

Geological Characteristics and Significance of Gold Bearing Detonated Breccia Pipe in Getang Area of Anlong County,Guizhou

作　　者：刘文[1] 张钟华[1] 陆建宝 季国松[2] 陈正山[1] 冯运富[1] 田永红[1] 方开雄 LIU Wen;ZHANG Zhong-hua;LU Jian-bao;JI Guo-song;CHEN Zheng-shan;FENG Yun-fu;TIAN Yong-hong;FANG Kai-xiong(117 Geological Party,Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550018,Guizhou,China;102 Geological Party,Guizhou Bureau of Geology and Mineral Exploration and Development,Zunyi 563000,Guizhou,China;Guizhou Geology Exploration Equipment Service Center,Guiyang 551400,Guizhou,China)

机构地区：[1]贵州省地矿局117地质大队,贵州贵阳550018 [2]贵州省地矿局102地质大队,贵州遵义563000 [3]贵州省地勘装备服务中心,贵州贵阳551400

出　　处：《贵州地质》2021年第3期283-291,共9页Guizhou Geology

基　　金：安龙县戈塘-海子地区金矿成矿规律与找矿远景研究(黔地矿科合[2017]26号);贵州省安龙鲁沟-白石坡地区矿产地质调查(12120114084001)。

摘　　要：新近在安龙戈塘地区发现的万人洞含金隐爆角砾岩筒位于戈塘穹隆中部,北东向断裂带附近。据隐爆角砾岩筒露头特征,围岩为中二叠统栖霞组、茅口组灰岩,含金隐爆角砾岩筒由内向外可分隐爆角砾岩带、震碎带和影响带,由内向外,金矿品位逐渐降低,蚀变逐渐变弱。据流体包裹体及硫同位素研究分析,成矿压力34.024-97.432 MPa,推测成矿深度1.13-3.24 km;成矿温度在150℃-170℃之间;成矿流体阴阳离子成分SO_(4)^(2-)、NO_(3)^(-)、Cl^(-)、Ba^(2+)、Ca^(2+)、Sr^(+)、Zn^(2+)、Cu^(2+)等,平均盐度为7.8 wt%NaCl,平均密度0.96 g/cm^(3),具有中高密度超高压流体浅层成矿的特点;硫同位素δ^(34)S在1.27‰-1.45‰之间,具有深源岩浆S的特点;综合研究认为万人洞含金“隐爆角砾岩筒”可能与重力推断的深部中酸性岩体有成因关系,值得近一步研究。Recently,the Wanrendong gold bearing detonated breccia pipe founded in Getang area of Anlong located in millde Getang dome,near the NE fault zone.According to the outcrop characteristics of detonated breccia pipe,the wall rock is limestone in Qixia formation and Maokou formation in middle Permian,the gold bearing detonated breccia pipe is divided into detonated breccia zone,shatter zone and effecting zone from inside to outside,the gold grade decrease gradually,the alteration become weak.By analysis the fluid inclusion and sulfur isotope study,the ore forming pressure is 34.024 to 97.432 MPa,the inferred ore forming depth is 1.13 to 3.24km,the ore forming temperature is 150℃to 170℃,the cation and anion of ore forming fluid are SO_(4)^(2-)、NO_(3)^(-)、Cl^(-)、Ba^(2+)、Ca^(2+)、Sr^(+)、Zn^(2+) and Cu^(2+),the average salty is 7.8wt%,the average density is 0.96 g/cm^(3),has the characteristics of high-middle density,ultra-high pressure fluid and shallow ore forming,the sulfur isotopeδ^(34) S is 1.27‰to 1.45‰,has the feature of deep source magma S.by comprehensible research,it’s thought that Wanrendong gold bearing detonated breccia pipe may has genetic relation with gravity inferred deep intermediate acid rock and worth to do further study.

关 键 词：金矿 隐爆角砾岩 中酸性岩体 戈塘地区 

分 类 号：P618.51[天文地球—矿床学]