摘要
洞岩铅锌矿为渝东南酉阳地区新发现的中型矿床,由产于奥陶系桐梓组、红花园组中的两个矿体(K1、K2)组成,受断裂控制明显。根据矿床地质、矿物组合及矿脉之间的穿切关系,将其铅锌成矿作用划分为三阶段:Ⅰ-方解石-石英-重晶石(黄铁矿)阶段;Ⅱ-方解石-石英-萤石-黄铁矿-闪锌矿-方铅矿阶段;Ⅲ-方解石-石英阶段。系统的流体包裹体岩相学及显微测温研究表明:Ⅱ阶段方解石、石英及萤石中普遍发育L型、L+V型和V型流体包裹体,成矿流体属中低温、低盐度NaCl-H_(2)O体系热液。对比研究显示,洞岩与黔东-湘西地区MVT型铅锌矿床在成矿时代与成矿流体特征上存在明显差异,为燕山期中-低温热液脉型矿床。
The Dongyan deposit is a recently discovered medium-sized Pb-Zn deposit located in the Youyang area,Southeastern Chongqing.It includes K1 and K2 ore bodies in the Tongzi and Honghuayuan formations of Ordovician,which are controlled by F2 and F3 faults,respectively.According to the deposit geology,mineral assemblage and the cross-cutting relationship between ore veins,the mineralization of Dongyan deposit can be subdivided into three stages:stageⅠof calcite-quartz-barite(pyrite);stageⅡof calcite-quartz-fluorite-pyrite-sphalerite-galena;stageⅢof calcite-quartz.Systematic petrography and microthermometry of fluid inclusions show that Liquid-type,Liquid+Vapor-type and Vapor-type fluid inclusions are widely developed in calcite,quartz and fluorite of stage Ⅱ,and the ore-forming fluid are the NaCl-H_(2)O hydrothermal system with medium low temperature and low salinity.The comparative study indicates that the Dongyan deposit is obviously different in metallogenic age and ore-forming fluids from the MVT-type Pb-Zn deposits in eastern Guizhou and western Hunan provinces,and is a Yanshanian middle-low temperature hydrothermal deposit.
作者
张遵遵
龚银杰
漆双林
李剑锋
甘金木
ZHANG Zun-Zun;GONG Yin-Jie;QI Shuang-Lin;LI Jian-Feng;GAN Jin-Mu(Wuhan Centre of China Geological Survey(Central South China Innovation Center for Geosciences),Wuhan 430205,China;Zhongnan Institute of Metallurgical Geology,Yichang 443003,Hubei,China)
出处
《华南地质》
CAS
2021年第1期45-52,共8页
South China Geology
基金
中国地质调查局项目“武陵山成矿带酉阳-天柱地区地质矿产调查”(DD20179232)和“南岭成矿带大义山-骑田岭锡矿地质调查”(DD20190154)。
关键词
洞岩铅锌矿床
流体包裹体
矿床成因
渝东南
Dongyan Pb-Zn Deposit
fluid inclusion
metallogeny
southeastern Chongqing
