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甘肃某地变质岩系中的铌矿床是无产阶级文化大革命期间发现的。除铌构成独立的工业矿床外,铈族稀土、磷等可综合利用。本文根据矿区几年来的工作成果对该矿床地质特征作一简要介绍,並对矿床成因加以初步探讨。不妥之处,希望在该区工作过的各兄弟单位同志多加指正。 (一)矿区地质概况矿区地层分基底和盖层两部分(图1)。盖层为白垩系下统紫红色、杂色砂砾岩,分布于矿区四周及内部小断陷盆地中,不整合于基底岩系之上。基底为震旦系上统
Niobium deposits in the metamorphic rocks of a certain place in Gansu were discovered during the Great Proletarian Cultural Revolution. In addition to niobium constitute an independent industrial deposits, the cerium rare earth, phosphorus and other comprehensive utilization. Based on the achievements of the mine over the past several years, this paper gives a brief introduction to the geological features of the deposit and makes a preliminary discussion on the genesis of the deposit. Inappropriate, I hope that all the fraternal units that have worked in this area will correct more. (A) Geological Overview Mining area strata and basement cover two parts (Figure 1). The caprock is a Cretaceous lower purple red and variegated glutenite conglomerate distributed in the periphery of the mining area and in the internal small rift basin and unconformity in the basement rock series. The basement is the Sinian system