黔东南浅变质碎屑岩中金矿属于造山型金矿的证据  

Evidence Analysis of Gold Deposits in Epimetamorphic Detrital Catergoried to Orogenic Gold Deposit in Southeast Guizhou Province,China

作　　者：陶平 王亮 刘锐[2] 

机构地区：[1]贵州省地质调查院,贵阳550004 [2]贵州大学,贵阳550003

出　　处：《地质科技情报》2013年第4期157-161,共5页Geological Science and Technology Information

基　　金：贵州省2010年度公益性;基础性地质科研项目"黔东南地区金矿成矿规律及找矿靶区研究(2010-2012)";贵州省优秀科技教育人才省长专项资金项目"黔东南天锦黎地区剪切带构造与找金方向研究"[黔省专合字(2009)70号]

摘　　要：经与国内外造山型金矿成矿环境基本属性的类比,首次提出了黔东南地区新元古界浅变质岩系中的金矿可能属于造山型金矿,并处于造山型金矿床地壳连续模式中的浅成带、低绿片岩相的区域地质环境中。其主要依据有以下9个方面:①整体处于陆内碰撞型造山带的外带;②深部构造处于上地壳的幔坡带及幔坳区的过渡带;③容矿岩石变质程度较低,为低绿片岩相;④各级别成矿单元受不同级序构造逐级控制;⑤所见金矿一般受控于脆性剪切带,个别受控于脆-韧性剪切带;⑥金矿定位于造山型金矿床地壳连续模式中的浅成带、低绿片岩相的区域,主要为Au单元素富集成矿;⑦单个矿床内成矿元素具垂直分带弱、侧向分带较明显变化特征;⑧含矿流体一般具有富CO2、低盐度等特点;⑨金矿成矿作用期与加里东期变质作用同步或略为滞后。By analogy analyzing the basic attributes of orogenic gold deposits in the world,this paper first suggests that the gold deposits in epimetamorphic detrital rocks in Southeast Guizhou Province are categorized to the orogenic gold deposit and the deposits are located in epizone,low greenschist facies area of crustal continuum model of orogenic-type gold deposits.There are 9 evidences to support this suggestion：（1） This area is located in external belt of the Caledonian intracontinental collision-type orogenic belt.（2） Deep structure is in the mantle slope belt and mantle depression zone.（3） The metamorphic degree of ore-bearing rocks is low-greenschist facies.（4） Each level of metallogenic units is controlled by different orders of geological structure respectively.（5） Most of the gold deposits are controlled by the brittle shear zone,some of them are controlled by brittle-ductile shear zone.（6） The gold deposits are located in epizone,low greenschist facies area of crustal continuum model of orogenic-type gold deposits,and they are single-element（Au） enrichment and mineralization.（7） The vertical zoning of metallogenetic element is low distinguishable in a gold deposit but the lateral zoning is distinct.（8） The ore-bearing fluid is generally rich with CO2 but low with salinity.（9） The gold mineralization is synchronous with the Caledonian metamorphism or slightly behind.

关 键 词：造山型金矿 成矿作用 造山带 黔东南 

分 类 号：P618.51[天文地球—矿床学]