作　　者： ; ; ; ; (孟祥元）; (武峰）; (王立生）;

机构地区： 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

出　　处： 《岩石学报》 2012年第1期302-318,共17页

摘　　要： 河北省青龙满族自治县四拨子-六拨子钼铜矿位于燕辽成矿带东部,是近年来发现的中型钼铜矿床。辉钼矿呈细脉状、网脉状、浸染状、薄膜状赋存于长城系石英砂岩及白云岩中的矽卡岩带,钼矿化与硅化关系密切。矿体呈似层状、脉状和透镜状。矿床的形成经历了矽卡岩期和石英-硫化物期,铜和钼矿化主要形成于石英-硫化物期。研究表明,矽卡岩期矿物以发育液体包裹体为特征,石英-硫化物期石英中主要发育液体包裹体、含CO2两相和三相包裹体。矽卡岩期成矿流体为高-中温(192～497℃)、中-低盐度(5.41%～16.53%NaCleqv)、中-低密度(0.59～0.92g/cm3)的NaCl-H2O体系。石英-硫化物期成矿流体为中-低温(主要变化于160～330℃)、低盐度(2.07%～15.17%NaCleqv)和中低密度(0.69～1.01g/cm3)的NaCl-H2O-CO2(±CH4/N2)型流体。石英的δDSMOW为-128‰～-80‰,δ18OSMOW值为9.6‰～14‰,δ18OH2O值为-3.61%～5.30‰,表明成矿流体具有岩浆水混合大气降水的特征。硫化物的δ34S变化于-0.9‰～5.7‰,平均值为2.9‰,表明成矿物质中硫来自深部岩浆。成矿时代为早侏罗世早期,成矿作用与花岗斑岩岩浆期后热液活动有关。 Sibozi-Liubozi molybdenum-copper deposit in Qinglong County is located in the east of Yanliao metallogenic belt,which is a newly-discovered medium-sized molybdenum-copper deposit.Molybdenite occurs in veinlets,stockwork,disseminated and membrane in the skarn hosted in quartz sandstone and dolomite,Changcheng System.The molybdenum mineralization is closely related with silicification.Ore bodies occur as bedded-like,vein and lenticular.On the basis of field evidence and petrographic analysis,the ore-forming process can be divided into two mineralization periods:skarn and quartz-sulfide.The quartz-sulfide period represents the main molybdenum-copper mineralization episode in the Sibozi-Liubozi deposit.Inclusions of the skarn period are dominantly fluid inclusions,while inclusions in quartz of the quartz-sulfide period mostly contain liquid inclusions,CO 2bearing three-phase inclusions and pure CO2 phase inclusions.Ore-forming fluids of skarn period are NaCl-H2 O system,the homogenization temperatures and salinities vary from 1 92 to 497℃and from 5.41%to 1 6.53%equivalent respectively while the densities range from 0.59 to 0.92g/ cm 3 .Ore-forming fluids of quartz-sulfide period are NaCl-H2 O-CO2(±CH 4 /N2)type of fluids,the homogenization temperatures and salinities vary mainly from 1 60 to 330℃and from 2.07%to 1 5.1 7%equivalent respectively while the densities range from 0.69 to 1.01 g/cm 3 .Theδ 18 O SMOW values of quartz in the ore vein range from 9.6‰to 1 4‰with correspondingδ 18 O H2 O values of-3.61‰to 5.30‰andδD values of fluid inclusions between-1 28‰and-80‰.The isotopic data imply that the ore-forming fluids of SiboziLiubozi molybdenum-copper deposit have the characteristic of mixing magmatic and meteoric water.Theδ 34S values of sulfide range from-0.9‰to 5.7‰with an average of 2.9‰,indicating that the sulfur in the fluids was derived from deep-seated magma.The Sibozi-Liubozi molybdenum-copper deposit took place in the earlier times of Early Jurassic,with its metallogenesis relat

关 键 词： 流体包裹体 稳定同位素 成矿流体 成矿机制 钼铜矿 四拨子 六拨子

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