论火山型铁矿床的成矿机制

本文以康滇地轴火山型铁矿床的地质、同位素、铁的地化性质和热力学资料为依据,提出了各类火山型铁矿床的成矿机制及共生、演化规律。火山喷发间歇期,铁以FeCl_2气体,经射气分异作用上升,与地下水发生氧化作用,逐渐形成胶状流体和粥状熔浆或高温富水铁质流体,以喷溢、贯入、喷气、气液交代和沉积作用形成各种火山型铁矿床。

MINERALIZATION MECHANISM OF VOLCANOGENIC TYPE IRON ORES

On the basis of geologieal and geochemical study of the volcano-eruptive and ore magma injective ironore deposits of the Kangdian Geoaxis, an ore-genesis meehanism of volcanic iron ores is presented. At theintermittent periods of voleanic eruption iron as?nds upward in the form of FeCl_2 through emanative dif-feremelation. In this process FeCl_2 is oxidized with ground water to form colloidal fluids, which is thentransformed. into vi?ous lav? flow or high temperature aqueous iron floodinng, injection, emanation,metasomati? as well as s?dimentationt of these flow or fluids resuit in the formation of various types ofvoleani?iron ore, which are normally paragenetic in apace and can be transitional with each other.