龙首山中段加里东期花岗岩浆作用与铀成矿作用研究述评

CALEDONIAN GRANITIC MAGMATISM AND U MINERALIZATION IN MIDDLE LONGSHOUSHAN

龙首山中段广泛出露加里东期花岗质岩体,是龙首山花岗质岩浆活动带的重要组成部分,加里东期花岗质岩浆活动与铀成矿(尤其是碱交代型铀矿化)关系密切。本文通过综合分析前人研究成果并结合项目组认识,系统总结了龙首山地区铀成矿带内加里东期花岗岩浆作用特征和铀成矿作用特征,在此基础上探讨了该区加里东期岩浆作用与铀成矿作用之间的关系。认为该区加里东期花岗岩浆作用与铀成矿(尤其是碱交代型铀矿化)关系十分密切,既为铀成矿提供主要铀源,也为铀成矿提供热源。同时认为该区在岩浆岩成岩成矿时代、成岩成矿构造环境、成矿物质来源等方面的研究程度较低。

The caledonian granite pluton are widely outcropped in the middle Longshou mountain Orogen, Gansu, which take an important part of the Longshou mountain granitic magma activity beh,and the caledonian of granitic magma activity and uranium mineralization have close relationships （especially alkali metasomatism type uranium mineralization）. In this paper, according to comprehensive analysis of the predecessors＇ research results and com-hining with the project team, to summarize uranium metallogenic belt in caledonian granite magmatism and uranium mineralization characteristics in the Longshou mountain, on the basis of it, we discusse the relationship between the uranium mineralization and caledonian magmatism in the area.We think that the caledonian granite magmatism and uranium mineralization, particularly alkali metasomatism type uranium mineralization, is closely related, both provides the main uranium source for uranium mineralization and provide heat source for uranium mineralization. At the same time, we think that era of magmatic rock diagenetic mineralization in the area, dia-genetic metallogenic tectonic environment, source of ore-forming materials of degree are low.