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时间:2020-03-26
《黑龙江高松山金矿区赋矿火山岩成因及构造意义.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、矿物岩石地球化学通报Bu11etinofMineralogy,PetrologyandGeochemistry·成岩成矿地球化学·Vo1.33No.5,Sep.,2O14里,t'’U江,上高同松,I.厶山金矿区赋矿火山岩成因及构造意义王佳琳,顾雪祥,章永梅,刘瑞萍,郑硌中国地质大学(北京)地质过程与矿产资源国家重点实验室,地球科学与资源学院,北京100083摘要:为探讨高松山金矿床成矿背景和矿床成因,对其主要赋矿围岩下白垩统板子房组火山岩进行了岩相学和地球化学研究。结果显示,该区火山岩以玄A安山岩、安山岩和粗安岩为主,其S
2、i()z含量为51.51~56.75,TiOz含量较低(1·02~1.61),Mg()含量变化较大(1.51~7.10),Mg#值中等(34~66),Naz()+KzO值为3.45~6.52,里特曼指数为1.15~3.42,属钙碱系列火山岩。微量元素分析表明,岩石相对富集轻稀土元素,轻、重稀土元素分馏较强,具有弱的Eu负异常(3Eu0.86~1.07),富集大离子亲石元素和U、Pb等元素,亏损Nb、Ta、Ti、P等高场强元素。上述研究表明,高松山金矿区火山岩的岩浆源区为受俯冲带流体交代的岩石圈地慢,有不同程度的分离结晶,受
3、陆壳混染影响较小。综合区域构造背景,初步认为该区1尺山岩的形成与古太平洋板块对欧亚大陆下的俯冲作用关系密切,构造环境可能为活动大陆边缘背景下的陆缘弧。关键词:岩石成因;火山岩;板子房组;浅成低温热液型金矿床;黑龙江省中图分类号:P581文献标志码:A文章编号:10072802(2014)05056111doi:10.3969/}.issn.1007—2802.2014.05·002PetrogenesisandTectonicImplicationsofVolcanicRocksintheGaosongshanGoldDe
4、posit,HeilongjiangProvinceWANGJia—lin,GUXue—xiang,ZHANGYong—mei,LIURui—ping,ZHENGI.uoStateKeyLaboratoryo/ProcessesandMineralResources,SchoolofEarthSciencesandResources,ChinaUniversityofGeosciences(Beijing),Beijing100083,ChinaAbstract:TheGaosongshangolddepositisspa
5、tiallycloselyassociatedwiththevolcanicrocksoftheBanzifangFor—mation.whichwereformedintheEarlyCretaceous.Thepetrogenesisandtectonicsettingsstudyaboutthevolcanicrockswillprovideanimportantbasisonunderstandingthemetallogenicsettingandtheoregenesis.Basedonpe—trography
6、andgeochemistrystudy,thevolcanicrocksarecomposedofbasalticandesite,andesiteandtrachyande—site.Geochemica1resultsindicatedthattheSiO2contentsareintherangeof51.51%一56.75,TiO2andMg()contentsareintherangeof1.02一1.61and1.51一7.1O,respectively,andMgvaluechangesfrom34to66
7、.ThecontentsofNaO+K2Oareintherangeof3.45一6.52,whichshowsthecalc—alkalinecharacteristicsbasedontheRittmannindex.ThetraceelementanalysisshowedthattherocksareLREEenrichedwithinsignifi—cantlynegativeEuanomalyof3Eu=0.86—1.07,andthatintensefractionationbetweenIREEandHRE
8、Eexists.TherocksareallenrichedinIIIEandU,Pb,HFSE,suchasNb,Ta,Ti,P.ThepetrologicandgeochemicalstudyshowedthatthevolcanicrocksintheGaosongshanGoldDepositw
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