本文選題：晶質(zhì)鈾礦 + 電子探針定年　； 參考：《巖礦測試》2017年06期

【摘要】：晶質(zhì)鈾礦和瀝青鈾礦是熱液鈾礦床的主要工業(yè)鈾礦物,在研究熱液鈾礦床成因及成礦規(guī)律方面具有重要的意義。攀枝花大田地區(qū)是我國混合巖型熱液鈾礦分布區(qū),已發(fā)現(xiàn)粗粒特富鈾礦滾石(鈾含量10%)及較富基巖礦石(鈾含量為0.1%~2%),主要鈾礦物為晶質(zhì)鈾礦,對兩種晶質(zhì)鈾礦成分及形成時代的研究對該區(qū)混合巖型熱液鈾礦成礦規(guī)律研究具有重要的價值。本文通過對大田地區(qū)滾石中的晶質(zhì)鈾礦和基巖礦石中的晶質(zhì)鈾礦進行礦物學及電子探針分析,研究了晶質(zhì)鈾礦的成分及形成時代。結(jié)果表明:(1)大田地區(qū)滾石和基巖礦石中的晶質(zhì)鈾礦除鉛之外化學成分較為相似,兩類礦石晶質(zhì)鈾礦中UO_2含量為77.36%~84.04%,ThO_2含量為0.98%~5.59%,PbO含量為1.79%~8.8%,其中滾石晶質(zhì)鈾礦中的鉛含量低于基巖晶質(zhì)鈾礦,釷含量高于基巖晶質(zhì)鈾礦;(2)電子探針化學定年結(jié)果表明,基巖礦石晶質(zhì)鈾礦的形成時代為774.9~785.5 Ma,滾石晶質(zhì)鈾礦的形成時代為783.7 Ma,與傳統(tǒng)同位素測年結(jié)果(775~777.6 Ma)非常一致,一方面說明滾石晶質(zhì)鈾礦和基巖晶質(zhì)鈾礦為同一時代的產(chǎn)物,另一方面說明電子探針原位測年方法是可靠的;(3)在后期的熱液蝕變中,晶質(zhì)鈾礦先后發(fā)生了硅化、碳酸鹽化及赤鐵礦化,蝕變發(fā)生的時間分別為730.6Ma、699.8 Ma和664.0 Ma。此結(jié)論對研究攀枝花大田地區(qū)熱液鈾礦成礦時代及成礦作用過程提供了依據(jù)。
[Abstract]:Crystalline uranium deposits and asphaltene uranium deposits are the main industrial uranium deposits in hydrothermal uranium deposits, which is of great significance in studying the genesis and metallogenic regularity of hydrothermal uranium deposits. The Panzhihua Datian area is the distribution area of mixed rock type hydrothermal uranium deposits in China. It has been found that the coarse grained Uranium-rich uranium ore (uranium content 10) and the relatively rich bedrock ore (uranium content 0.1%) and the main uranium ore are crystalline uranium deposits. The study on the composition and formation age of two kinds of crystalline uranium deposits is of great value for the study of the metallogenic regularity of mixed rock type hydrothermal uranium deposits in this area. Based on mineralogical and electron probe analysis of uraninite ore in rolling rock and bedrock ore in Datian area, the composition and forming age of uraninite have been studied in this paper. The results show that the chemical composition of the uraninite ore except lead in the rolling stone and bedrock ore in Datian area is similar. The UO_2 content of the two types of uranium ores is 77.36 / 84.04 and the content of Tho _ 2 is 0.98 / 5.59 respectively. The content of PBO is 1.79 and 8.8.The content of lead in the uranite is lower than that in the crystalline uranium ore of bedrock, and the content of thorium is higher than that of the crystalline uranium ore of bedrock. The results of electron probe chemical dating show that the content of lead in the uranite is lower than that in the crystalline uranium ore of the bedrock rock, and the content of thorium is higher than that of the crystalline uranium ore of the bedrock. The formation age of crystalline uranium deposit in bedrock ore is 774.9 ~ 785.5 Ma, and the age of uranium ore in rolling rock is 783.7 MaA, which is very consistent with the result of traditional isotopic dating. On the one hand, it shows that the uraniferous ore and the crystalline uranium deposit of bedrock are the products of the same age. On the other hand, it is shown that the in situ electron probe dating method is reliable. In the later hydrothermal alteration, the uraninite occurred successively in silicification, carbonization and hematitization, and the time of alteration was 730.6 Ma 699.8 Ma and 664.0 Ma, respectively. This conclusion provides a basis for studying the metallogenic age and metallogenic process of hydrothermal uranium deposits in the Panzhihua Datian area.
【作者單位】： 成都理工大學地球科學學院;核工業(yè)280研究所;四川省地質(zhì)礦產(chǎn)勘查開發(fā)局106地質(zhì)隊;
【基金】：中國核工業(yè)地質(zhì)局科研項目(201637,201638)
【分類號】：P597.3;P619.14

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