【摘要】：對粵北長江鈾礦田賦礦花崗巖、蝕變花崗巖、鈾礦石、瀝青鈾礦、黃鐵礦、方解石和螢石開展了系統(tǒng)的REE,U與Th的地球化學研究,結果顯示各類樣品表現(xiàn)出類似的LREE相對富集、HREE相對虧損和Eu負異常的地球化學特征,表明樣品REE特征具有一定的繼承性,繼承了賦礦花崗巖的REE特征。成礦早期鈉交代作用對花崗巖中REE遷移較小,但對U有預富集作用,成礦期熱液蝕變對花崗巖中REE遷移較明顯,尤其是HREE,而Th表現(xiàn)出相對穩(wěn)定的特征。從成礦早期到晚期方解石ΣREE逐漸降低(ΣREE平均值由48.86×10~(-6)→43.52×10~(-6)→28.40×10~(-6)),Eu負異常趨于減弱(δEu均值由0.23→0.31→0.39),表明成礦流體向相對氧化環(huán)境演化。成礦熱液中REE,U與Th活化、遷移具同步性和同時性。熱液沸騰和去氣作用是造成瀝青鈾礦、方解石和螢石相對富集HREE的原因。由成礦早期到成礦晚期,成礦熱液向相對氧化的酸性流體演化。
[Abstract]:A systematic REE,U and Th geochemical study of granites, altered granites, uranium ores, asphaltene uranium deposits, pyrite, calcite and fluorite has been carried out on the Yangtze River uranium deposit in northern Guangdong Province. The results show that the samples exhibit similar geochemical characteristics of LREE relative enrichment hree depletion and Eu negative anomaly, indicating that the REE characteristics of the samples are inherited to some extent and inherited the REE characteristics of ore-bearing granite. Sodium metasomatism in the early stage of mineralization has little effect on REE migration in granite, but preenrichment on U, and hydrothermal alteration during metallogenic period is more obvious for REE migration in granite, especially HREE, and Th show relatively stable characteristics. The 危 REE of calcite gradually decreased from the early metallogenic stage to the late stage (the mean value of 危 REE decreased from 48.86 脳 10 ~ (-6) ~ (-6) ~ (43.52) 脳 10 ~ (-6) ~ (-6) ~ (28.40 脳 10 ~ (-6) ~ (28. 40) 脳 10 ~ (-6) ~ (-6) to a negative anomaly (未 Eu = 0.23 ~ 0.31 ~ (0.39), indicating that the ore-forming fluid evolved into a relatively oxidizing environment. REE,U and Th are activated in mineralizing hydrothermal solution, and the migration is synchronous and simultaneous. Hydrothermal boiling and degassing are responsible for the relative enrichment of HREE in asphaltene uranium, calcite and fluorite. From the early metallogenic stage to the late metallogenic stage, the ore-forming hydrothermal fluid evolves to the acidic fluid of relative oxidation.
【作者單位】： 東華理工大學核資源與環(huán)境國家重點實驗室培養(yǎng)基地;核工業(yè)290研究所;
【基金】：國家自然基金項目(U1403292) 中國地質(zhì)調(diào)查局項目(12120115035601) 省部共建核資源與環(huán)境國家重點實驗室培育基地自主基金項目(Z1608) 江西省研究生創(chuàng)新項目(YC2016-B074)
【分類號】：P595;P619.14

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