本文選題：拉拉IOCG礦床 + 圍巖蝕變��； 參考：《大地構(gòu)造與成礦學(xué)》2016年05期

【摘要】：拉拉IOCG礦床是我國西南地區(qū)著名的大型鐵銅礦床,礦床中與銅(鉬)礦化密切相關(guān)的鈉長石化、碳酸鹽化、鉀長石化、黑云母化、螢石化等蝕變作用廣泛發(fā)育。本文在對該礦床中黑云母片巖系列和鈉長石變粒巖系列大量賦礦巖石樣品進行巖相學(xué)研究的基礎(chǔ)上,選取典型蝕變與礦化樣品進行主、微量元素分析測試,通過質(zhì)量比簇判別法和等濃度公式元素定量遷移計算研究礦床中蝕變元素特征及其與礦化的關(guān)系。質(zhì)量比簇判別法和等濃度圖解法確定了兩個系列巖石共有的主量元素不活動組分為SiO_2,微量元素不活動組分為Yb。主量元素定量遷移計算表明黑云母片巖系列銅礦化與鈉長石化和碳酸鹽化成正相關(guān)關(guān)系,鈉長石變粒巖系列銅礦化與鉀長石化和碳酸鹽化成正相關(guān)關(guān)系,且變粒巖系列碳酸鹽化程度較片巖系列更強。稀土元素和金屬元素定量遷移計算發(fā)現(xiàn)拉拉IOCG礦床中U、Co、Mo、Ni等成礦金屬元素在蝕變過程中隨Cu礦化大量帶入,說明熱液蝕變是拉拉Fe-Cu-Au-U-Mo-REE多金屬礦床形成的主要原因。蝕變與礦化關(guān)系分析表明二者基本是同步發(fā)生,蝕變的過程也是礦化的過程,即蝕變的標志也是找礦的標志。拉拉IOCG礦床中蝕變元素地球化學(xué)特征及其與礦化關(guān)系的研究,對于礦床成礦理論的豐富及礦區(qū)進一步找礦勘探工作都具有重要意義。
[Abstract]:Lala IOCG deposit is a famous large iron copper deposit in southwest China. Albite carbonization potassium feldspar biotite and fireflitization are widely developed in the deposit which are closely related to copper (molybdenum) mineralization.Based on the petrographic study of a large number of ore-bearing rock samples of biotite schist series and albite granulite series in the deposit, typical alteration and mineralization samples are selected for the analysis and testing of main and trace elements.The characteristics of altered elements in ore deposits and their relationship with mineralization are studied by means of mass ratio cluster discrimination method and quantitative element migration calculation with equal concentration formula.The mass ratio cluster discrimination method and the equal concentration diagram method have determined that the inactivity components of the principal elements shared by the two series of rocks are SiO-2, and the trace element inactive components are Yb.The quantitative migration calculation of major elements shows that the copper mineralization of biotite schist series is positively correlated with albite and carbonization, and that of albite granulite series is positively correlated with potassium feldspar and carbonization.The carbonization degree of granulite series is stronger than that of schist series.The quantitative migration calculation of rare earth elements and metal elements shows that the ore-forming metal elements such as U _ (Co _ (Co) Mo _ (Mo) Ni) in Lala IOCG deposit are brought in with Cu mineralization in large quantities during the alteration process, indicating that hydrothermal alteration is the main reason for the formation of Lala Fe-Cu-Au-U-Mo-REE polymetallic deposit.The analysis of the relationship between alteration and mineralization shows that the process of alteration occurs simultaneously and the process of alteration is also a process of mineralization, that is, the mark of alteration is also the mark of prospecting.The study of geochemical characteristics of altered elements and its relationship with mineralization in Lala IOCG deposit is of great significance for the enrichment of ore forming theory and the further exploration of ore deposits.
【作者單位】： 成都理工大學(xué)地球科學(xué)學(xué)院;中國科學(xué)院地球化學(xué)研究所;
【基金】：國家自然科學(xué)基金項目(41072065) 教育部博士點基金(20105122110001) 西南地區(qū)主要成礦帶銅鐵金多金屬找礦模型與勘查方法技術(shù)研究(12120113095500) 礦床地球化學(xué)國家重點實驗室(200808) 四川省教育廳重點項目(07ZA005)聯(lián)合資助
【分類號】：P618.41;P618.31

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