CAJ | 학술논문

通过对小坑桥金矿不同地质体的稀土元素对比分析,得到以下认识：不同地质体的轻、重稀土比值较高,表明轻、重稀土元素分馏明显；近矿围岩出现明显的负 Eu 异常；黑云母花岗岩与煌斑岩具有相同的稀土元素特征,认为其可能为同源岩浆产物；金矿体的稀土元素总量与近矿围岩的稀土总量比较接近,表明金矿体继承了围岩的稀土元素组成；金矿体与花岗斑岩均具弱负 Eu 异常,认为两者很可能在成因上有必然的联系；矿区特征元素与稀土元素的蛛网图显示,Au、As、Sb 元素在金矿体中明显偏高,表明 Au、As、Sb 元素与金的成矿关系密切。综合指出,小坑桥金矿体的成矿物质不仅仅来源于中元古界黄浒洞组地层本身,而且很可能为深部花岗斑岩所提供,其成矿流体很可能为岩浆分异演化的产物,为今后矿区地质勘查工作提供有利依据。
통과대소갱교금광불동지질체적희토원소대비분석,득도이하인식：불동지질체적경、중희토비치교고,표명경、중희토원소분류명현；근광위암출현명현적부 Eu 이상；흑운모화강암여황반암구유상동적희토원소특정,인위기가능위동원암장산물；금광체적희토원소총량여근광위암적희토총량비교접근,표명금광체계승료위암적희토원소조성；금광체여화강반암균구약부 Eu 이상,인위량자흔가능재성인상유필연적련계；광구특정원소여희토원소적주망도현시,Au、As、Sb 원소재금광체중명현편고,표명 Au、As、Sb 원소여금적성광관계밀절。종합지출,소갱교금광체적성광물질불부부래원우중원고계황호동조지층본신,이차흔가능위심부화강반암소제공,기성광류체흔가능위암장분이연화적산물,위금후광구지질감사공작제공유리의거。
Through comparative analysis on the rare-earth elements of different geological bodies in Xiao-kengqiao gold deposit,the following conclusions can be reached:the ratios of light to heavy rare-earth ele-ments of different geologic bodies are relatively high,which means obvious fractional distillation of light and heavy rare-earth elements;obvious negative Eu anomalies occur in near-ore wall rocks;biotite granite and lamprophyre have the same rare-earth element characteristics,so the authors believe that they are cognate magmatic offspring;the total rare-earth elements of the gold orebody is close to that of near-ore wall rocks, it appears that the gold orebody succeed to the rare-earth composition of wall rocks;weak negative Eu anom-alies occur in both the gold orebody and the granite porphyry,so it is believed that they are inevitably related in respect of genesis;according to the spider diagram of the characteristic elements and rare-earth elements of the mining area,the contents of Au,As and Sb are relatively high,which suggests that these elements are closely related to the gold mineralization.The paper indicates that the ore-forming materials of Xiaokengqiao gold orebody not only come from strata of Mesoproterozoic Huanghudong Formation,but also are likely provided by granite por-phyry in deep part.The ore-forming fluid is likely the product of the differential evolution of the magma.These con-clusions provide a useful basis for future geological survey works in the mining area.