江西省船坑铜矿成矿岩体地球化学特征、锆石U-Pb定年及地质意义  

Geochemical Characteristics of Metallogenetic Rock and Zircon U-Pb Dating in the Chuankeng Cu Deposit of Jiangxi Province and Geological Implications

作　　者：孙建东[1] 骆学全[1] 吕劲松[1] 张雪辉[1] 李凤春[2] 叶海敏[1] 

机构地区：[1]南京地质矿产研究所,南京210016 [2]中国冶金地质总局山东局测试中心,山东济南250014

出　　处：《地质与勘探》2016年第3期506-517,共12页Geology and Exploration

基　　金：中国地质调查局项目(编码:12120113065500)资助

摘　　要：分析了船坑铜矿成矿岩体石英闪长玢岩主微量、稀土元素特征及锆石U-Pb测年数据,表明岩石具高钾偏铝质I型花岗岩特征,及岛弧成因岩浆特点;锆石稀土元素表明有地壳物质的加入,属壳幔混源。锆石U-Pb年龄162.9±3.6Ma,大致代表含矿岩体成岩年龄。该矿床形成于钦杭成矿带铜矿主成矿期,处于岩石圈拆沉或伸展-减薄的构造环境,受太平洋板块往欧亚大陆的俯冲的影响。This work analyzed features of main and trace, and rare earth elements and zircon U-Pb dating of the metallogenic rock,quartz diorite por- phyrite in the Chuanhang Cu deposit of Jiangxi Province. The results show that the rock is characterized by high potassium aluminum type I granite and magma of island-arc genesis. The existence of Nb negative anomalies and rare earth elements shows the addition of crustal material into zircon, forming a crust-mantle mixed source. Zircon U-Pb age of 162.9 ± 3.6 Ma can largely represents the diagenetic time of ore-bearing rock. This deposit formed in the primary mineralization period of the Qinhang metallogenic zone,in alithospheric delamination or extension- thinning tectonic environment, probably affected by the subduction of the Pacific plate beneath the Eurasia continent.

关 键 词：船坑铜矿 地球化学 U-PB定年 稀土元素 

分 类 号：P616[天文地球—矿床学]