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《延边天宝山多金属矿田辉钼矿Re-Os同位素年龄及其地质意义.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、2013年4月矿床地质第32卷第2期April,2013MINERALDEPOSITS32(2):427-435文章编号:0258—7106(2013)02—0427—09延边天宝山多金属矿田辉钼矿Re—Os同位素年龄及其地质意义张勇,孙景贵n,邢树文2,赵克强,张增杰2,马玉波2(1吉林大学地球科学学院,吉林长春130061;2中国地质科学院矿产资源研究所,北京100037)摘要延边天宝山为一大型中高温热液多金属(铅,锌,铜,钼等)矿田,是由新兴铅锌、立山铅锌铜和东风铅锌铜钼3个矿床所组成。文章在矿田地质特征研究的基础上,进行了辉钼矿
2、Re一()s同位素体系定年研究,得到结果w(Re)为0.353-9.306/zg/g,模式年龄为174.7-200.3Ma,加权平均值年龄为(194.6±3.9)Ma,等时线年龄为(196.6±2.5)Ma(MSWD=0.94,:9),表明天宝山多金属矿田为早侏罗世岩浆作用及相关流体活动的产物,形成于华北板块和西伯利亚板块碰撞拼合后伸展环境,初步认为成矿物质来源主要为壳源。结合区域上已有的高精度年代学数据,将吉林省中东部山区钼成矿作用划分为2期:早侏罗世(196.6~186Ma)和中侏罗世(176.9-166.9Ma),且以中侏罗世钼矿
3、化最为发育。关键词地球化学;Re-Os同位素测年;钼成矿作用;天宝山多金属矿田;延边中图分类号:P618.65文献标志码:ARe-OsdatingofmolybdenitefromTianbaoshanpolymetallicorefieldinYanbiananditsgeologicalsignificanceZHANGYong,SUNJingGui,XINGShuWen2,ZHAOKeQiang,ZHANGZengJie2andMAYut~2(1CollegeofEarthSciences,JilinUniversity,Chan
4、gchun130061,Jilin,China;2InstituteofMineralResources,ChineseAcademyofGeologicalSciences,Beijing100037,China)AbstractTheTianbaoshanorefield,alargehydrothermalpolymetallic(1ead,zinc,copper,molybdenum)orefieldinYanbian,iscomposedofXinxinglead—zincdeposit,Lishanlead—zinc—cop
5、perdepositandDongfenglead—zinc.cop—per—molybdenumdeposit.Onthebasisofgeologicalfeatures,theauthorscarriedoutRe-Osdating,andthere—suitsshowthattheRecontentofthemolybdenitevariesfrom0.353×10to9.306×10.themodelagesrangefrom174.7to200.3Mawiththeweightedmeanagebeing(194.6±3.9
6、)Maandtheisochronagebring(196.6_-4-2.5)Ma(MSWD=0.94,=9).ThesedataindicatethatmolybdenummineralizationtookplaceinearlyJurassic,andthegeodynamicsettingwascloselyrelatedtotheextensionfromthecontinentalcollisionbe—tweentheNorthChinaPlateandtheSiberiaPlate.Theore—formingmater
7、ialsmighthavebeenderivedmainlyfromthecrust.Combinedwiththehighprecisionchronologicdataofregionalintrusions,theauthorshavear—rivedattheconclusionthatMomineralizationofthemiddleandeastpartofJilinProvincecanbedividedinto2epochs:EarlyJurassic(196.6~186Ma)andMiddleJurassic(17
8、6.9~166.9ma),withtheMiddleJurassice一*本文得到中国地质调查计划项目(资[2010]矿评01—26—06)、吉林省科技发展规划项目(批准号:20100450)和国家自然科学
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