本文選題：砂巖型鈾礦　切入點：黃鐵礦　出處：《地質(zhì)學(xué)報》2016年12期 　論文類型：期刊論文

【摘要】：鄂爾多斯盆地東北部是我國砂巖型鈾礦重要成礦區(qū)。通過對盆地北部大營鈾礦床直羅組賦礦地層砂巖野外觀察、鏡下鑒定發(fā)現(xiàn),黃鐵礦存在多種產(chǎn)狀,它們的宏觀、鏡下產(chǎn)狀存在一定對應(yīng)關(guān)系。對黃鐵礦硫同位素的分析測試以及蝕變礦物的研究發(fā)現(xiàn),δ~(34)S的變化范圍-36.5‰~-27.3‰,平均值為-32.28‰,為較小的負值,具有明顯生物成因作用。同時草莓狀黃鐵礦以及生物碎屑胞腔中的鈾礦物的發(fā)現(xiàn),也證實了鈾成礦期的生物作用。地下水中U~(6+)、Fe~(2+)與"輕"的H_2~(32)S發(fā)生氧化還原反應(yīng),從而形成了黃鐵礦與鈾礦的緊密伴生的現(xiàn)象。
[Abstract]:The northeast part of Ordos Basin is an important metallogenic area of sandstone-type uranium deposits in China. Based on the field observation of the bearing strata of Zhiluo formation in the Daying uranium deposit in the northern part of the basin, it is found that there are many kinds of occurrence of pyrite and their macroscopical characteristics. From the analysis of sulfur isotopes of pyrite and the study of altered minerals, it is found that the variation range of 未 ~ (34) S is -36.5 鈥，

本文編號：1591846