胶东金青顶金矿床围岩蚀变特征与金矿化.pdf

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1、矿物岩石地球化学通报·专题研究·BulletinofMineralogy，PetrologyandGeochemistryVo1．31No．1，Jan．2012胶东金青顶金矿床围岩蚀变特征与金矿化陈海燕，李胜荣，张秀宝，张运强，周起凤，崔举超，刘振豪。，宋玉波。1．中国地质大学地质过程与矿产资源国家重点实验室，北京100083；2．河北省区域地质矿产调查研究所，廊坊065000；3．山东金洲矿业集团有限公司，山东乳山264500摘要：金青顶金矿围岩蚀变发育，从近矿到远矿依次发育黄铁绢英岩化、绢英岩化

2、和钾长石化，并呈近似对称的带状分布。由地表至深部，钾长石化蚀变强度有增大的趋势，局部出现膨大收缩的豆荚状构造特征；绢英岩化浅部较发育，深部反复尖灭重现；黄铁绢英岩化带宽度很窄，仅浅部独立成带产出。各类蚀变过程中与Au成矿相关的Ag、As、Hg等元素含量增加，蚀变围岩中成矿元素以带入为主，推测围岩的主要作用是冷却成矿热液，并改变其化学性质，使成矿物质在有利的容矿空间沉淀富集，而非提供成矿物质的母岩。关键词：围岩蚀变；微量元素；金青顶金矿；胶东中图分类号：P618．510．652文献标识码：A文章编号：

3、1007—2802(2O12)01-0005—09WallRockAlterationandGoldMineralizationintheJinqingdingGoldDeposit，EasternShandongProvinceCHENHal—yan，LISheng—rong，ZHANGXiu—bao，ZHANGYun—qiang。，ZHOUQi—feng，CUIJu—chao，LIUZhen—hao。，SONGYu—bo。1．StateKeyLaboratoryofGeologicalProce

4、ssandMineralResources，ChinaUniversityofGeosciences，Beijing100083，China；2．HebeiInstituteofRegionalGeologicalandMineralResourceSurvey，Langfang065000，China；3．GoldContinentGroupGeologicalProspectingLimitedCompany，Rushan，Shandong264501，ChinaAbstract：Thestud

5、yofwal1rockalterationintheJinqingdinggolddepositshowsthattherearepyritizationsilicifica—tion-sericitization．silicification-sericitizationandpotash—alterationfromproximaltodista1．ItiSshowedthat，fromshallowtodeepstrata，thealterationzoneofpotassicbecomewi

6、derandthebeanpodedstructureoccursinsomeplaces，andthatsilicification—sericitizationisdevelopedcommonlyintheshallowstratumbutrepeatedlydisappearsindeepstrata，andthatpyritizationsilicification-sericitizationonlyoccursintheshallowstratum．Theanalyticalre—su

7、ltsofAurelatedtraceelements(Ag，As，Hg)indicatedthattheircontentsincreasegraduallyfromtheunalteredgranitetotheslightlyalteredgraniteandtothestronglyalteredgraniteintheorebody．Itisconcludedthatwallrockisnotthemainsourceoftheore-formingmaterial，andthatthem

8、ainroleofthewallrockistocausechemicalpropertychangesofthehydrothermalfluidbycoolingitdownandtocontributetooreformationatcertainspecialspaces。Keywords：Wallrockalteration；Trace—elements；Jinqingdinggolddeposit；Jiaodong金青顶金矿床位于牟平一乳山金矿带中部，是目