江西冷水坑银铅锌矿田闪锌矿铷-锶测年及地质意义  

Rb-Sr Dating of Sphalerites from the Lengshuikeng Ag-Pb-Zn Deposit , Jiangxi , and Its Geological Significances

作　　者：徐贻赣[1,2,3] 吴淦国[1,2] 王长明[1,2] 张达[1,2] 张垚垚[1,2] 

机构地区：[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]中国地质大学岩石圈构造、深部过程及探测技术教育部重点实验室,北京100083 [3]江西省地质矿产勘查开发局九一二大队,江西鹰潭335001

出　　处：《地质学报》2013年第5期621-633,共13页Acta Geologica Sinica

基　　金：中国地质调查局地质调查工作项目(编号1212011085472,1212010533105,1212010981048);中央高校基本科研业务费专项资金(编号2010ZY02);国家自然科学基金项目(编号40772134);国土资源部公益性行业科研专项经费项目(编号200911007);“111计划”(编号B07011)共同资助的成果

摘　　要：江西冷水坑矿田是武夷山地区重要的银铅锌集中区之一。无论其是世界上少有的斑岩型银铅锌矿床还是火山沉积-热液改造型矿床都独具特色,具有很高的研究价值。冷水坑矿田含矿斑岩的锆石年龄为162～155Ma,可作为花岗斑岩侵入的时间,绢云母Ar-Ar年龄与含矿斑岩活动时间的一致性说明冷水坑早期成矿发生于斑岩成岩过程中。本文首次采用闪锌矿Rb-Sr同位素测年方法获得冷水坑矿田成矿年龄为126.9±7.1Ma,代表了冷水坑矿田晚期阶段矿化的年龄。冷水坑Ag-Pb-Zn矿田中大型—超大型矿床的形成,不但受中国东部燕山期构造体制转换的制约,而且受长期多阶段矿化的影响。fhe Lengshuikeng ore tield in Jiangxi Province is one oi the most important Ag-Pb-Zn deposits in northern Wuyi Mountains, China. It＇s a typical porphyry Ag-Pb-Zn deposit in the world, as well as volcanic sedimentary-hydrothermal reworked deposit are quite unique and rare, and therefore worthy of detailed research. Mineralization age from 4o Ar/39Ar age of sericite is consistent with the emplacement age of 162 ~ 155 Ma from the ore-bearing porphyry, indicating that the deposit formed on early stage of mineralization age. Rb-Sr dating of sphalerite yielded an isochron age of 126.9~7.1 Ma, which represents the late stage of mineralization age. Formation of the large and super-large deposits in the Lengshuikeng ore field constrain is not only restricted by the tectonic regime transformation of the intracontinental setting in Eastern China, but also affected by long-term and multiple stage mineralizations.

关 键 词：RB-SR定年 闪锌矿 成矿时代 地质意义 江西冷水坑 

分 类 号：P597.3[天文地球—地球化学]