摘要
闽西北地区稀有金属矿产以混合岩化矿床,尤其是混合岩化伟晶岩型矿床数量多,分布广,意义大。按其地质特征及在混合岩带上的位置,可划分为混合岩化原地-准原地和异地伟晶岩两类。稀有金属矿产的形成和分布,主要受混合岩化作用控制。稀有金属矿床(点)成群出现,成带分布,构成以混合岩带(田)为中心,按侧列式或环状展布的稀有金属矿化集中区。本文还提出了区内稀有金属矿产成岩成矿演化序列及成矿模式的初步意见。
Rare metal deposits in northwestern Fujian are characterized by numerous,widespread and significant miginatized deposits,particularly migmatized pegmatite-type deposits.According to their geological characteristics and positions in the migmatite zone,they may be classified into the migmatized autochthonous-subautochthonous and allochthonous pegmatite types.The latter is the only industrial type of Nb-Ta deposits.The formation and distribution of rare metal deposits in northwesten Fujian are controlled by such factors as strati-graphy/lithology,structural movements,magmatic activity,metamorphism and migmatization.They were formed in a certain geologic period and underwent certain inheritance,evolution and development.They are spatially associated with a certain metamorphic facies zone or migmatite zone.Among various factors,migmatization played an important role in controlling the formation and distribution of rare metal deposits.Rare metal deposits(occurrences)occur in groups and are arranged in zones,forming a concentration area of rare metal mineralizations distributed en echelon or radially with the migmatite zone(field)as the centre.Besides,this paper also proposes the evolutional succession of rock and ore deposit formation and a model of ore genesis for rare metal deposits.
作者
苏友庆
Su Youqing(Northern Fujian Geological Party,Fujian Burean of Geology und Mineral Resources)
出处
《地质论评》
1986年第1期42-49,共8页
Geological Review
