土屋斑岩铜矿研究进展

Progress in studies on the tuwu porphyry copper deposit

土屋斑岩铜矿位于康古尔塔格断裂与大草滩断裂之间,是我国最为重要的斑岩型铜矿之一.火山岩地层、赋矿围岩及成矿母岩地球化学特征表明岩石形成于活动陆缘环境.同位素及化石资料表明矿床形成于早石炭世晚期,成矿物质主要来源于幔源,成矿流体主要为岩浆水和大气降水.在大洋俯冲地球动力背景下,洋壳板片部分熔融形成埃达克质岩浆,成矿物质随岩浆上升,并在岩体顶部富集成矿.

Located between Kangguertage and Dacaotan faults, the Tuwu porphyry copper deposit is one of the most important porphyry copper deposits in China. Geochemical characteristics of the volcanic strata, wall-rocks and parent rocks suggest that the deposit first appeared at active continental margins. And isotope and fossil data indicate that the deposit came into being in late Early Carboniferous. Mantle substances mainly contribute to the deposit while a mixture of meteoric water and magma water form ore-bearing fluids. And the adakitic magmas originated from partial melting of subducted oceanic slabs. As the adakitic magmas ascended,the metallogenetic elements accumulated on the top of the rock body. Finally, the deposit was produced.