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

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。

Geochemical characteristics of metallogenetic rock and zircon U-Pb dating in the Chuankeng Cu deposit of Jiangxi Province and geological implications

This work analyzed features of main and trace, and rare earth elements and zircon U-Pb dating of the metallogenic rock, quartz diorite porphyrite, in the Chuanhang Cu deposit of Jiangxi Province. The results show that the rocks 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 implies the addition of crustal material into zircon, forming a crust-mantle mixed source. Zircon U-Pb age 162.9±3.6 Ma can largely represent the diagenetic time of ore-bearing rock. This deposit formed in the primary mineralization period of the Qinhang metallogenic zone, in a lithospheric delamination or extension - thinning tectonic environment, probably affected by the subduction of the Pacific plate beneath the Eurasia continent.