新疆准噶尔北缘玉勒肯哈腊苏铜(钼)矿床流体包裹体和稳定同位素研究  被引量:7

Fluid inclusion and stable isotope study of Yulekenhalasu copper-(molybdenum) deposit in northern margin of Junggar,Xinjiang

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作  者:杨富全[1] 刘国仁[2] 秦纪华[2] 张志欣[3] 刘振江[2] 张立武[2] 魏广智[2] 刘锋[1] 耿新霞[1] 

机构地区:[1]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 [2]新疆地质矿产勘查开发局第四地质大队,新疆阿勒泰836500 [3]中国科学院新疆生态与地理研究所新疆矿产资源研究中心,新疆乌鲁木齐830011

出  处:《矿床地质》2012年第5期965-982,共18页Mineral Deposits

基  金:国家自然科学基金项目(编号:40972069);国家重点基础研究发展计划项目(编号:2007CB411302)联合资助

摘  要:玉勒肯哈腊苏中型斑岩型铜(钼)矿主要赋存在闪长玢岩中,有少量矿化产在北塔山组火山岩及似斑状黑云母石英二长岩中。矿化呈细脉状、细脉-浸染状和浸染状。围岩蚀变主要为钾化、硅化、绢云母化、石膏化、磁铁矿化、绿泥石化、绿帘石化。矿床的形成经历了斑岩期、剪切变形期和表生期,铜和钼矿化主要形成于斑岩期的硫化物-钾硅酸盐阶段和辉钼矿阶段。石英和方解石中的流体包裹体可划分为H2O-NaCl型和H2O-CO2(±CH4/N2)-NaCl型。硫化物-钾硅酸盐阶段的成矿温度为141~500℃,主要集中在200~340℃;流体的w(NaCleq)为2.96%~14.97%;流体的密度为0.60~0.98 g/cm3。碳酸盐阶段的流体以中-低温度(140~320℃)和低盐度〔w(NaCleq)为2.74%~10.61%〕为特征。硫化物的δ34S值集中于-4.5‰^-0.1‰,峰值为-3.5‰,表明硫来自深源岩浆。石英和方解石的δ18OSMOW值为9.1‰~13.2‰,δ18OH2O值为2.05‰~6.28‰,δD值为-120‰^-97‰,表明主成矿阶段的成矿流体主要是岩浆水,混合有大气降水;碳酸盐阶段的流体主要为大气降水,混合有岩浆水。成矿时代为中泥盆世〔(373.9±2.2 Ma)〕,成矿作用与闪长玢岩的侵入有关。温度和压力的降低导致流体沸腾,同时,水-岩交换反应、流体成分的改变等在铜钼成矿过程中起着主导作用。The Yulekenhalasu medium-size porphyry copper-(molybdenum) deposit occurs in the diorite porphyry, with some mineralization also observed in the porphyroid biotite quartz monzonite and volcanic rocks of theBeitashan Formation. Mineralization occurs as veinlets, veinlet-disseminations and stockworks. Wall-rock altera tion is well developed, and mainly comprises K-feldspathization, biotitization, quartzification, sericitization, magnetitization, gypsification, chloritization, and epidotization. According to cutting relationships of the ore veins, mineral assemblages, paragenetic sequence and ore fabrics, the ore-forming process can be divided into three metailogenic periods: porphyry, shear deformation and supergene periods. The sulfides-K-silicate stage and the molybdenite stage in the porphyry period constituted the main stages for copper mineralization and molybdenum mineralization, respectively. Two types of fluid inclusions, namely H2O-NaCl and HaO-CO2 ( + CH4/N2)-NaCltypes, have been recognized in quartz and calcite. Homogenization temperatures of fluid in- clusions in the sulfides-K-silicate stage vary from 141℃ to 500℃, concentrated from 200℃ to 340℃. Salinity w(NaCleq)ranges from 2.96% to 14.97%. Ore fluid densities range from 0.60 to 0.98 g/cm3. Fluids of the carbonate stage are characterized by medium-low temperatures (140℃ to 320℃ ) and low salinities (2.74 % to 10.61% ). δ34S values of sulfides associated with mineralization range from - 4.5‰ to - 0.1‰, with the peak being - 3.5‰, indicating that sulfur was derived from deep-seated magma. δ18OsMow values of quartz and cal- cite range from 9.1‰ to 13.2‰, with the corresponding 318OH2o values between - 2.05‰ and 6.28‰, and 3D values of fluid inclusions vary between - 12‰ and - 97‰. The combined isotopic data imply that the ore- forming fluids of the sulfides-K-silicate stage in the Yulekenhalasu Cu-(Mo) deposit were mainly derived from magmatic fluids, with a minor part from the meteoric water,

关 键 词:地球化学 斑岩铜(钼)矿床 流体包裹体 硫、氢、氧同位素 成矿作用 玉勒肯哈腊苏 准噶尔北缘 新疆 

分 类 号:P618.41[天文地球—矿床学] P618.65[天文地球—地质学]

 

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