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时间:2020-03-23
《中国东部钼矿成矿背景与成岩-成矿时差讨论.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、2010年12月矿床地质第29卷第6期DeeoTlber,2010MINERALDEPOSITSVo1.29No.6文章编号:0258—7106(2010)06—0935—21中国东部钼矿成矿背景与成岩一成矿时差讨论杜保峰,魏俊浩,王启2,李艳军,刘国春2,于海涛2,刘永利2(1中国地质大学资源学院,湖北武汉430074;2内蒙古赤峰市地质矿产勘查开发院,内蒙古赤峰024000)摘要中国东部中生代钼矿带属滨太平洋成矿域,钼矿床多沿不同构造单元的交界部位及区域性深大断裂呈带状分布,集中分布在东秦岭、燕辽
2、、长江中下游、南岭和大兴安岭等钼矿成矿带。结合前人成果,以典型矿床为例,初步讨论了中国东部各个钼矿成矿带的成矿背景,成矿很可能与碰撞造山后的伸展背景和(或)太平洋板块俯冲有关。文章根据收集到的中国东部典型钼矿床的成矿年龄及相关岩体的同位素测年数据,详细讨论并定量厘定了钼矿床的成岩与成矿时差。结果表明,钼矿成矿同步或略滞后于同源岩浆活动,两个成矿高峰的时差分别为0~10.0Ma和0~15.0Ma;对于单个矿床,成岩一成矿时差集中在0~14.0Ma,均值为4.1Ma;从斑岩型一斑岩一矽卡岩型一矽卡岩型一石
3、英脉型钼矿床,成岩一成矿时差呈递增趋势,这恰与岩浆热液成矿过程的客观地质事实相吻合。关键词地质学;钼矿;成矿背景;成岩一成矿时差;中国东部中图分类号:P618.65文献标志码:ADiscussiononmetallogenicsettingandtimedifferencebetweenmagmatismandmineralizationofmolybdenumdepositsinEastChinaDUBaoFeng!WEIJunHao,WANGQi,LIYanJun,LIUGuoChun2,YUHa
4、iTao2andLIUYongLi,(1FacultyofEarthResources,ChinaUniversityofGeosciences,Wuhan430074,Hubei,China;2ChifengInstituteofGeologicalandMineralExplorationofInnerMongolia,Chifeng024000,InnerMongolia,China)AbstractEastChinawasintenselyaffectedbytheMarginalPacifi
5、cMetallogenicDomaininMesozoic.Mostmolybde—numdepositsalongborderareasofdifferenttectonicunitsorregionaldeepfaultsaredominantlydistributedinsuchmetallogenicbeltsasEastQinling,Yanshan—Liaoning,Middle—LowerreachesoftheYangtzeRiver,Nan—lingandDaHingganMount
6、ains.Combinedwithpreviousstudies,thispaperdiscussesmetallogenicsettingsoftheseregionsexemplifiedbytypicaloredeposits,anddrawstheconclusionthatMomineralizationintheseme—tallogenicbeltsprobablyresultedfromtheextensionalsettingofpost—collisionand/orsubduct
7、ionofthePacificPlate.Accordingtoisotopicdataofmineralizationandore—relatedrockscollectedfromsometypicalModepositsinEastChina,theauthorsinvestigatedindetailandquantitativelydeterminedthecharacteristicsoftimediffe—rencebetweenmagmatismandmineralizationfor
8、Modeposits.MomineralizationinEastChinaoccurredcon—temporaneouslywithorimmediatelyafterore-relatedgranitoids.TimedifferencesofthetwopeakingstagesofMomineralizationarewithin0~10.0Maand0~15.0Marespectively.ForasingleModeposit.thetim
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