江西九瑞地区东雷湾矽卡岩型铜多金属矿床流体包裹体特征及稳定同位素地球化学研究  

Fluid inclusion characteristics and stable isotope geochemistry of the Dongleiwan skarn Cu polymetallic deposit in the Jiujiang-Ruichang metallogenic area, Jiangxi Province

作　　者：贾丽琼[1,2] 徐文艺[2] 杨丹[2] 莫宣学[1] 杨竹森[2] 陈伟十[2] 王梁[1,3] 

机构地区：[1]中国地质大学地球科学与资源学院地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京100037 [3]武警黄金地质研究所,河北廊坊065000

出　　处：《岩石矿物学杂志》2015年第2期184-204,共21页Acta Petrologica et Mineralogica

基　　金：国家十二五科技支撑计划课题(2009BAB43B03;2011BAB04B03);国家深部探测技术与实验研究专项(Sino Probe-03-06);国土资源部公益性行业科研专项项目[201311166(Sino Probe-03-07)]

摘　　要：对位于江西九瑞地区的东雷湾矽卡岩型铜钼金多金属矿床主成矿阶段(石英金属硫化物阶段)石英中的流体包裹体进行了岩相学和显微测温研究。结果表明,与成矿有关的包裹体类型主要有4类,成矿流体的均一温度和盐度主要集中于210~350℃和1%~9%,总体属于高中温、中低盐度流体体系。包裹体的气相成分以H2O和CO2为主,其次有N2、CO、O2,有少量CH4、C2H2;液相成分中,阳离子以Ca2+、K+、Na+为主,含少量Mg2+,阴离子以Cl-、SO2-4为主,含少量NO-3、NO-2,流体属于CO2-H2O-Na Cl-Ca Cl2(KCl)体系,计算所得离子浓度为3.1%~34.5%。氢、氧同位素特征显示,主成矿阶段成矿流体δ18OH2O值为0.93‰~5.20‰,δDV-SMOW值为-81‰^-64‰,表明成矿流体主要为岩浆水,有极少量大气降水混入。矿石硫化物的δ34SV-CDT‰值为-2.2‰~3.4‰,结合铅、铼同位素特征表明,东雷湾矿床的成矿物质主要来源于上地幔,同时有一定量的壳源物质混入。东雷湾矿床为热液交代矽卡岩型矿床,区域褶皱和断裂为成矿岩浆提供运移通道,岩浆侵位发育矽卡岩型岩浆流体系统,并伴随有Cu(Mo、Au等)矿化,最终形成矿床。Located in northwestern Jiujiang-Ruichang metallogenic area, the Dongleiwan skarn Cu-Mo-Au polymetallic deposit belongs to Jiujiang-Ruichang Cu-Au orefield, which is a component part of the Middle-Lower Yangtze River Cu-Au metallogenic belt and the Daye-Jiujiang metallogenic subzone. Petrographic and microthermometric studies of fluid inclusions in quartz from the main metallogenic phase（ quartz-polymetallic sulfide phase）show that the inclusions related to mineralization include mainly four types. Homogenization temperature and salinity w（ Na Cleq） of the ore-forming fluids are concentrated in 210 ~ 350℃ and 1% - 9% respectively, suggesting medium-high temperature and medium-low salinity. Gases of fluid inclusions mostly contain H2 O and CO2, followed by N2, CO and O2, with a small amount of CH4 and C2H2. Cations of liquid composition mostly consist of Ca^2 ＋,K^＋and Na^＋, followed by a small amount of Mg^2 ＋, while anions are mainly Cl^-, SO4^2-, followed by NO3^- and NO2^-, and the fluid is of the CO2-H2O-Na Cl-Ca Cl2（ KCl） system, with the calculated ion concentrations ranging from 3. 1% to 34. 5%. Hydrogen-oxygen isotope characteristics show that the δ18OH2Ovalues of the ore-forming fluids in the main metallogenic stage are in the range of 0. 93‰ - 5. 20‰, and δDV-SMOWvalues vary between- 81‰and- 64‰, which implies that the ore-forming fluids were mainly derived from magmatic fluids, with the mixture of a small amount of meteoric water. The δ34SV-CDT‰ values of sulfides range from- 2. 2‰ to 3. 4‰. Lead and rhenium isotopic composition of the ore indicates that the ore-forming materials of the Dongleiwan deposit were derived mostly from the upper mantle, and partially from the crustal materials. The Dongleiwan deposit is a hydrothermal metasomatic skarn type deposit. The folds and fractures of this area provided the migration pathway for mineralization, and magmatic emplacement developed skarn type magmatic fluid subsystems, accompanied by Cu（ Mo,Au, etc.） mineralizat

关 键 词：矽卡岩型矿床 流体包裹体 同位素地球化学 成矿作用 东雷湾矿区 九瑞地区 

分 类 号：P618.41[天文地球—矿床学] P597[天文地球—地质学]