浙江省衢州地区新路火山岩盆地西段铀矿物种类及其地质意义  

TYPES OF URANIUM AND ITS GEOLOGICAL SIGNIFICANCE IN THE WEST SEGMENT OF XINLU VOLCANIC BASIN IN QUZHOU CITY,ZHEJIANG PROVINCE

作　　者：韩效忠[1] 刘权[2] 惠小朝[2] 孙志富[2] 王明太[2] 汤江伟 金淼张 

机构地区：[1]中国煤炭地质总局特种技术勘探中心(中煤地质工程总公司),北京地质调查分公司,北京100073 [2]核工业北京地质研究院,北京100029 [3]浙江省核工业269大队,浙江金华321000

出　　处：《矿物岩石》2014年第4期15-22,共8页Mineralogy and Petrology

基　　金：国家高技术研究发展计划(863计划)课题(2012AA061801);中国地质调查局项目"我国主要盆地煤铀等多矿种综合调查评价"(编号:资[2014]01-030-004)

摘　　要：通过对浙江省衢州地区新路火山岩盆地西段宏观和微观地质现象的观察,发现本区铀矿物种类主要为沥青铀矿和钛铀矿,且沥青铀矿形成时间较早,其成矿温度为140℃-180℃,晚期的钛铀矿以脉状穿插或包裹状的形式与沥青铀矿分布在一起,其成矿温度较高,为290℃-420℃,指示本区铀矿化具有中高温热流活动改造的特征,而不是之前认为的中低温热液型铀矿床;同时本次研究在火山角砾中发现了火山喷发前就已形成的铀矿化,指示该区除了发育上述提到的火山喷发期后的两期铀矿化之外,还存在一期早于火山喷发的铀矿化,综合分析其最有可能就位的部位为火山岩盆地与基底的接触界面附近。即在本区铀矿找矿时,在勘探浅部两期火山喷发期后铀矿化的同时,还应关注深部早于火山喷发这一期铀矿化的调查。这些认识对深化本区铀矿床成因类型的认识和增强攻深找盲的信心均具有一定的帮助作用。Study on the macro-and micro-observation of the geological phenomena in the Xinlu area shows that the main types uranium minerals are pitchblende and brannerite in this area,pitchblende at temperature ranging from 140℃-180℃,is earlier,while the late brannerite combined with pitchblende as vein interspersed or mutual embedding at temperature ranging from 290℃-420 ℃.It is indicated that uranium mineralization in this area has undergone reformation by high temperature heat flow activity,rather than the meso-epithermal uranium mineralization.In this area,the uranium mineralization in the volcanic breccias before volcanic eruption were recovered,which means that the other uranium mineralization before volcanic eruption exist in the most prospective area,where is the contact interface between the volcanic basin and the basement,besides two uranium mineralization after volcanic eruption period.In the other words,while two uranium mineralization stages after volcanic eruption period are explored,the uranium mineralization before volcanic eruption is not ignored.It is helpful to deepen the understandings of genesis of uranium deposit types and prospect the deep and blind ore bodies.

关 键 词：浙江省衢州 火山岩 铀矿物类型 

分 类 号：P588.14[天文地球—岩石学] P619.14[天文地球—地质学]