本文關(guān)鍵詞： 螢石 稀土元素地球化學(xué)特征 茂租鉛鋅礦床 成礦流體　出處：《中國(guó)稀土學(xué)報(bào)》2017年03期 　論文類型：期刊論文

【摘要】：巧家茂租鉛鋅礦床是滇東北礦集區(qū)的代表礦床之一,除礦石礦物閃鋅礦、方鉛礦、黃鐵礦外,螢石是其主要的脈石礦物。通過(guò)螢石的稀土元素地球化學(xué)特征研究,發(fā)現(xiàn)其中REE含量變化較大,特征參數(shù)也有差別,但其球粒隕石標(biāo)準(zhǔn)化曲線分配模式基本一致,不同礦化帶螢石均具有明顯的Ce負(fù)異常、中稀土富集、分配曲線相對(duì)平緩的特征。從鉛鋅礦體中心到外圍礦化帶,螢石稀土元素呈現(xiàn)∑REE逐漸減少、LREE富集變?yōu)镠REE富集,δEu正異常變?yōu)棣腅u負(fù)異常,δCe逐漸變小的變化特征。表明該礦床螢石的形成是一個(gè)連續(xù)過(guò)程,不同礦化帶的螢石是同一體系經(jīng)歷不同階段的產(chǎn)物。通過(guò)螢石的形成機(jī)制分析,認(rèn)為該礦床螢石是熱液作用的產(chǎn)物,是由富含F(xiàn)的成礦流體沿構(gòu)造活動(dòng)帶從下向上運(yùn)移,與燈影組地層的白云巖發(fā)生水-巖的相互作用,使流體中的CaF_2產(chǎn)生過(guò)飽和而大規(guī)模沉淀析出形成的,且隨著熱液向兩側(cè)圍巖遷移,不斷與圍巖發(fā)生水巖反應(yīng),分別形成了不同礦化帶的螢石。本文研究對(duì)揭示礦床鉛鋅成礦機(jī)制具有重要意義。
[Abstract]:QiaojiaMaozhao lead-zinc deposit is one of the representative deposits in northeast Yunnan. Except for sphalerite, galena and pyrite, fluorite is the main gangue mineral. The geochemical characteristics of rare earth elements of fluorite are studied. It is found that the REE content varies greatly and the characteristic parameters are different, but the distribution pattern of the standardized curve of chondrites is basically the same. The fluorite in different mineralization zones has obvious negative ce anomaly and enrichment of middle rare earth. The relatively gentle characteristics of the distribution curve. From the center of the Pb-Zn orebody to the peripheral mineralization zone, The rare earth elements of fluorite show the characteristics of 鈭，

本文編號(hào)：1497748