马达加斯加南部Tranomaro地区矽卡岩型钍矿钍的赋存状态及钍矿物特征研究  

The occurring forms of thorium and characteristics of thorium mineral of skarn-type thorium deposit in Tranomaro,southern Madagascar

作　　者：王凤岗[1] 范洪海 范存琨 

机构地区：[1]核工业北京地质研究院,北京100029 [2]福州东鑫矿业技术有限公司,福建福州350000

出　　处：《世界核地质科学》2010年第4期210-213,共4页World Nuclear Geoscience

摘　　要：Tranomaro地区钍矿化主要赋存在矽卡岩化Tranomaro辉岩中,其主要矿物成分有透辉石、方柱石和碳酸盐。钍以独立的钍矿物形式存在于辉岩中的辉石、方柱石、橄榄石及碳酸盐等矿物中,钍矿物大小为0.2～0.5mm,无共、伴生金属矿物。经电子探针测定,钍矿物的主要成分为ThO2、UO2和PbO,根据其成分特征和镜下特征确定钍矿物主要为方钍石和铀方钍石。赋矿主岩中无明显热液活动迹象,钍矿物主要形成于早(干)矽卡岩阶段。In Tranomaro,thorium mineralization mainly occurs in Tranomaro pyroxenite which formed under skarnization and it mainly consists of diopside,scaponite and carbonate.Thorium exists in the form of independent thorium minerals in pyroxene,scapolite,olivine and carbonate,etc.The magnitude of thorium minerals ranges from 0.2 mm to 0.5 mm,which has no other paragenetic and associated metallic mineral.With the assay of electric probe,the main components of thorium minerals are ThO2,UO2 and PbO.According to characteristics of its components and observation under microscope,it＇s concluded that thorium mineralization mainly contains thorianite and uranothorianite.There is no obvious pyrometasomatic phenomenon in ore.It＇s inferred that thorium mineralizion is formed in the early stage of skarnization.

关 键 词：辉岩 钍矿物特征 钍赋存状态 

分 类 号：P619.14[天文地球—矿床学] P598[天文地球—地质学]