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前言菜园子铁矿是一个小而富的磁铁矿床。它位于康滇地轴中段,东西构造与南北向构造的复合部位。矿体近东西向延展,倾向南,主要呈透镜状、似层状、不规则状产于前震旦系会理群力马河组碱性玄武岩中。关于该矿床的成因,曾有沉积变质、火山沉积和接触交代等看法。最近,笔者通过野外和室内研究,从含矿围岩及矿石特征中,发现了岩浆熔融体某些重要的分异现象。这些现象表明了该矿床的成因是基性熔浆经分异后喷出地表的铁矿浆矿床。
Preface Caiyuanzi iron ore is a small and rich magnetite deposit. It is located in the central axis of the Kang-Dian axis, east-west tectonics and north-south tectonic complex sites. Ore body extends nearly east-west direction, south, mainly lenticular, stratified, irregular shape produced in the former Sinian Climatic Group Lima group alkaline basalt. About the origin of the deposit, there have been sedimentary metamorphism, volcanic sediment and contact account of such views. Recently, through field and laboratory studies, we have identified some important differentiations in magma melt from the characteristics of ore-bearing rocks and ores. These phenomena indicate that the genesis of this deposit is the iron ore deposit ejected from the surface by the differentiation of basic melts.