江西省村前铜多金属矿床斜长花岗斑岩LA-ICP-MS锆石U-Pb年龄及地质意义  

Zircon LA-ICP-MS U-Pb age of plagiogranite porphyry in the Cunqian copper polymetallic deposit of Jiangxi Province and its geological implications

作　　者：王强[1] 孙燕[1] 张雪辉[2] 张世铭[1] 王瑜亮[1] 张春茂[1] 

机构地区：[1]成都理工大学,四川成都610059 [2]南京地质矿产研究所,江苏南京210016

出　　处：《中国地质》2012年第5期1143-1150,共8页Geology in China

基　　金：中国地质调查局计划项目(1212011120846)资助

摘　　要：村前铜多金属矿床是产于钦杭成矿带东段的重要的斑岩-矽卡岩矿床,含矿岩体为黑云母斜长花岗斑岩和斜长花岗斑岩,具有多次侵入特点及钙碱性岩石的地球化学特征。本研究采用了LA-ICP-MS技术,首次对含矿的斜长花岗斑岩岩体中的锆石进行了U-Th-Pb同位素分析,获得其成岩年龄为(169.3±1.1)Ma。这一年龄与钦杭成矿带中德兴花岗闪长斑岩、银山石英斑岩、冷水坑花岗斑岩、桐村花岗斑岩等岩体的年龄十分接近,揭示在钦杭成矿带175-156 Ma经历了一次大规模的岩浆侵位与成矿事件,形成了众多与埃达克质或钙碱质花岗岩有关的斑岩-矽卡岩型铜多金属矿床,进一步说明钦杭成矿带在此时期在同一岩浆-动力背景下形成了斑岩-矽卡岩型铜多金属矿成矿系列。The Cunqian copper polymetallic deposit is an important porphyry-skarn deposit along eastern Qinhang metallogenic belt.The ore-bearing intrusive body comprises biotite plagiogranite porphyry and plagiogranite porphyry,characterized by repeated invasion and calcium-basic rocks.The LA-ICP-MS technique was used in this study,and U-Th-Pb isotopic analysis was made for zircons from the ore-bearing plagioclase granite porphyry,with the petrogenic age obtained being（169.3 ± 1.1）Ma.This petrogenic age of the ore-bearing rock body is very close to ages of Dexing granodiorite porphyry,Yinshan quartz porphyry,Lengshuikeng granite porphyry and Tongcun granite-porphyry,suggesting that an event of large-scale magmatic emplacement and mineralization took place in 175-156Ma,which led to the formation of many porphyry-skarn copper polymetallic deposits related to adakite or alkali-calcic granite,and implying that the Qinhang metallogenic belt produced a metallogenic series of porphyry-skarn copper polymetallic deposits under the same magma-dynamic background in this period.

关 键 词：铜多金属矿床 斜长花岗斑岩 锆石U-PB LA-ICP-MS 成矿系列 村前 

分 类 号：P618.41[天文地球—矿床学]