广西大厂拉么锌铜多金属矿床成岩成矿作用年代学研究  

Lithogenesis and Mineralization Chronology Study on the Lamo Zinc-Copper Polymetallic Ore Deposit in Dachang Orefield,Guangxi

作　　者：李华芹[1] 王登红[2] 梅玉萍[1] 梁婷[3] 陈振宇[2] 郭春丽[2] 应立娟[2] 

机构地区：[1]中国地质调查局宜昌地质矿产研究所,湖北宜昌443003 [2]中国地质科学院矿产资源研究所,北京100037 [3]长安大学成矿作用及其动力学开放实验室,西安710054

出　　处：《地质学报》2008年第7期912-920,共9页Acta Geologica Sinica

基　　金：国家科技支撑计划“南岭地区有色-贵重金属成矿潜力及探测综合技术示范研究”课题(编号2006BAB01B03);地质大调查“我国重要矿产和区域成矿规律研究”(编号1212010633903);“中国成矿体系综合研究”项目(编号1212010634002);危机矿山接替资源勘查计划“广西南丹铜坑锡矿接替资源勘查”(编号200545022)资助的成果

摘　　要：本文对广西大厂矿田拉么矿区内出露的酸性侵入岩和矿石进行了精细的年代学研究,分别获得龙箱盖含斑黑云母花岗岩锆石原位SHRIMP U-Pb和全岩Rb-Sr等时线年龄为94±4Ma(95%可信度)和98.6±1.9Ma(95%可信度),矽卡岩成矿期锌铜矿石中石英矿物Rb-Sr等时线年龄为98.6±6Ma(95%可信度)。上述测定结果表明,拉么锌铜多金属矿床的成矿年龄与相关岩体的成岩年龄接近,均形成于早白垩世晚期。This article presents the precise chronology study on the acid intrusive rocks and mineralization in the Lame ore deposit of Dachang ore field in Guangxi using different isotopic datings. SHRIMP U-Pb in-situ zircon age of phenocryst-bearing biotite granite is 94±4Ma （with 95% credibility）, whole rock Rb-Sr isochrone age of that is 98.6 ± 1. 9Ma （with 95% credibility）, and quartz Rb-Sr isochrone age of zinccopper ore during skarn mineralization is 98.6 ± 6Ma （with 95 % credibility）. These results indicate that mineralization age of the Lame zinc-copper ore deposit is consistent to the lithogenesis age of correlated plutons, both at the late stage of Late Cretaceous Epoch.

关 键 词：成岩成矿作用 锆石SHRIMP U—Pb和全岩Rb-Sr等时线年龄 拉么锌铜多金属矿床 广西大厂 

分 类 号：P597.3[天文地球—地球化学]