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1、第40卷第3期中南大学学报(自然科学版)Vol.40No.32009年6月JournalofCentralSouthUniversity(ScienceandTechnology)Jun.2009义兴寨金矿床地质特征及成矿控制因素分析1,2344444郑镝,和志军,刘悟辉,刘忠法,刘清泉,郑明弘,徐桃(1.中国地质大学地球科学与资源学院,北京,100083;2.河南省有色金属地质勘查总院,河南郑州,450052;3.有色金属矿产地质调查中心南方地质调查所,湖南长沙,410001;4.中南大学地学与环境工程学院,湖南长沙,410083)摘要:针对与义兴寨金矿找矿勘
2、查密切相关的关键控矿因素,进行微量元素地球化学特征、同位素地球化学特征、含矿构造力学性质以及含金矿脉产出特征的对比分析。结果表明:燕山期中酸性岩浆侵入活动是矿床形成的主导因素,成矿在空间分布上与矿区南部超浅成相酸性岩关系最为密切;构造是成矿最重要的因素,控制了岩浆的侵入及其成矿岩体和矿体的形成和就位;地层则主要充当成矿期浅部领域内发育各种脆性控矿构造的良好围岩,以及在含矿流体的运移、聚集和定位过程中,充当良好的隔挡层。矿床成因属于典型的中低温岩浆热液型金矿床。关键词:义兴寨金矿床;石英脉型;控矿因素;超浅成相;岩浆热液中图分类号:P618.1文献标识码:A文章编
3、号:1672−7207(2009)03−0833−06Analysisongeologicalcharacteristicsandore-controllingfactorsofYixingzhaigoldoredeposit1,2344444ZHENGDi,HEZhi-jun,LIUWu-hui,LIUZhong-fa,LIUQing-quan,ZHENGMing-hong,XUTao(1.SchooloftheEarthSciencesandResources,ChinaUniversityofGeosciences,Beijing100083,China;
4、2.HenanNon-FerrousMetalsGeologicalExplorationInstitute,Zhengzhou450052,China;3.SouthInstituteofGeologicalSurvey,ChinaNon-ferrousMetalsResourceGeologicalSurvey,Changsha410001,China;4.SchoolofGeoscienceandEnvironmentalEngineering,CentralSouthUniversity,Changsha410083,China)Abstract:Ina
5、llusiontothekeyore-controllingfactorswhichiscloselyrelatedtomineralexplorationofYixingzhaigoldendeposit,thegeochemistryoftraceelements,isotopegeochemistrycharacteristic,mechanicalpropertyoforebearingstructureandthecharacteristicofgold-bearingveinsoutputwereanalysed.Theresultsshowthat
6、theintermediateacidmagmaticintrusiveactivitiesoftheYanshanianperiodarethedominantfactorintheformationofdeposit.Thespatialdistributionofmineralizationismostcloselyrelatedtothesouthernminingareawithultra-shallowphaseacidrock.Structureisthemostimportantfactorinoreformation,whichcontrols
7、theintrusionofmagmaandtheformationandperchofore-bearingrocksandorebody;stratumactsasfavorablehostrockofallkindsoforecontrolstructuresofthemetallogenicepochshallowplace,anditactsasobstructlayerduringmigrationaccumulationandorientationoftheore-bearingfluid.Thegenesisoftheoredepositbelo
8、ngstothetypi