江西大湖塘石门寺钨矿隐爆角砾岩型矿体地球化学特征与成因探讨  

Geochemical Characteristics and Ore Genesis of the Shimensi Cryptoexplosive Breccia Type Tungsten Deposit in Dahutang,Jiangxi Province

作　　者：阮昆[1,2] 潘家永[2] 吴建勇 项新葵[3] 刘文泉 李钟枢 

机构地区：[1]核工业二九0研究所,广东韶关512026 [2]东华理工大学放射性地质与勘探技术国防重点学科实验室,南昌330013 [3]江西省地质矿产勘查开发局916大队,江西九江332100

出　　处：《矿物岩石地球化学通报》2015年第3期633-641,共9页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(40963004,40972072);国家科技支撑计划项目(2011BAB04B02);中国地质调查局地质调查项目(1212011220781);中国地质调查局地质调查项目(1212011220781,12120115018101)

摘　　要：为探讨大塘钨矿石门寺隐爆角砾岩型钨矿床的成因,开展了野外详细观察、室内岩矿鉴定工作,用显微测温方法测定了隐爆角砾岩型矿体矿石石英中的流体包裹体,以及金属硫化物中的S同位素。结果显示,12件黄铜矿样品的δ34S值介于-1.4‰^-0.1‰之间,均值为-0.82‰;3件辉钼矿样品的δ34S值介于-0.8‰~0.2‰之间,均值为-0.33‰,表明S主要来自深部岩浆或者上地幔。均一温度介于152.1~387.1℃之间,主要集中在170~250℃;盐度为4.8%~14.9%Na Cleq(wt),均值为10.8%Na Cleq(wt),主要集中于8%~14%Na Cleq(wt)。表明成矿流体属中温、中-低盐度Na Cl-H2O±CO2体系,成矿流体在演化过程中经历了岩浆热液与低温、低盐度大气降水的混合作用与沸腾作用,流体的混合作用和沸腾作用是该类型含矿流体中络合物分解并沉淀成矿的主要因素。To explore the genesis of the Shimensi cryptoexplosive breccia type tungsten deposit in Dahutang, detailed field observation and indoor appraisal of rock ore has been carried out. Furthermore, quartz inclusions and sulfur isotope compositions of cryptoexplosion breccia type ores were tested by using micro thermometry. The results showed that δ^34S values of twelve chalcopyrite samples are between - 1.4‰ and -0. 1‰ with an average of -0.82‰ and δ^34S values of three molybdenite samples are between -0.8‰ and 0. 2‰ with an average value -0.33‰. The above figures showed that sulfur mainly came from deep magma or upper mantle. In addition, the homogenization temperature is between 152. 1 and 387. 1℃ , concentrating on 170 to 250℃. The salinity is between the range of from 4.8% to 14.9% NaCleq（wt） with an average of 10.8% NaCl q（wt）, concentrating on 8% to 14% NaCloq（wt）. The results showed that the ore-forming fluid belongs to the system of NaCl-H2O＋CO2 with middle temperature and medium-low salinity, which has gone through the boiling mixture action by the composition of magmatic hydrothermal and atmospheric rainfall with low temperature and low salinity in the evolution process, and the boiling mixture action of fluid is the primary cause of complex decomposition and precipitation in the type of ore-fluid.

关 键 词：隐爆角砾岩 S同位素 流体包裹体 大湖塘石门寺钨矿 

分 类 号：P618.67[天文地球—矿床学]