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乌吐布拉克中型铁矿床赋存于上志留统—下泥盆统康布铁堡组变质火山-沉积岩系中,矿体呈似层状、透镜状,矿体及其周围发育大量矽卡岩矿物。电子探针分析表明石榴石端员组分以钙铁榴石-钙铝榴石系列为主,辉石端员组分以透辉石为主,角闪石端员组分主要为铁镁钙闪石,这些特点表明矿区矽卡岩为交代矽卡岩中的钙矽卡岩。磁铁矿的主要组分、稀土及微量元素表明其形成与矽卡岩密切相关。结合矿床地质特征,认为矽卡岩是由岩浆热液流体交代康布铁堡组基性火山岩(熔岩和火山碎屑岩)及灰岩而形成的,磁铁矿的形成与矽卡岩的退化变质作用有关。
The Utbulak medium-sized iron ore deposit is hosted in the metamorphic volcano-sedimentary rock series of the Upper Silurian-Lower Devonian Kangbotebur Formation. The ore body is stratified and lenticular, with a large amount of silicon Carbone minerals. Electron probe analysis showed that the terminal member of garnet is dominated by the series of theodalite-alllite, the end-member of pyroxene is dominated by diopside, and the end-member of amphibole is mainly Fe-Ca-Ca Amphibole, these characteristics indicate that the skarn in the mining area is the calcium skarn in the skarn. The main components of magnetite, rare earth and trace elements indicate that its formation is closely related to skarn. Based on the geological characteristics of the deposit, it is considered that skarn is formed by hydrothermal fluids from the magmatic hydrothermal fluid interpreted as basic volcanic rocks (lava and pyroclastic rocks) and limestone from the Kontumbo Formation. The formation of magnetite and the degeneration of skarn Metamorphism related.