本文選題：含砷黃鐵礦 + 顯微特征�。� 參考：《地質(zhì)論評(píng)》2017年04期

【摘要】：諸廣巖體中段位于南嶺大火成巖省中部,為我國重要的花崗巖型鈾礦礦集區(qū)。本次研究聚焦于含砷黃鐵礦的特征及其與鈾成礦關(guān)系,利用顯微鏡下光薄片鑒定、背散射電子成像、X射線光電子能譜、陰極發(fā)光、電子探針、He—Ar同位素及電子結(jié)構(gòu)分析等技術(shù)方法研究了鈾礦石中黃鐵礦的微結(jié)構(gòu)、地球化學(xué)特征及其還原鈾的機(jī)理。分析表明,與瀝青鈾礦空間上存在伴生關(guān)系的黃鐵礦為粒狀含砷黃鐵礦,其形成于鈾成礦作用之前,在鈾成礦期間釋出S~-、Fe~(2+),且在主要鈾成礦之后被硅質(zhì)、次生鈾礦物等交代。電子探針主微量元素及He—Ar同位素分析結(jié)果表明,與鈾礦物有關(guān)的黃鐵礦虧S富As,微量元素含量具有較大變化區(qū)間,富集Mo、Cu、Zn、Pb、Sb等,含砷黃鐵礦具有相對(duì)較高的~3He值及n(~40Ar)/n(~36Ar)比值,形成于地殼流體占主導(dǎo)地位的殼幔混合流體。Rietveld結(jié)構(gòu)精修及密度泛函理論計(jì)算獲得的含砷黃鐵礦電子結(jié)構(gòu)特征表明,由于As元素的加入,S原子對(duì)費(fèi)米能級(jí)附近的價(jià)帶和導(dǎo)帶均產(chǎn)生了貢獻(xiàn),活性非常大,是導(dǎo)致其還原鈾的本質(zhì)�；谏鲜稣J(rèn)識(shí)及軟硬酸堿原理,探討了與堿、酸流體作用相關(guān)的"三階段"鈾成礦過程,認(rèn)為早期鈾成礦與含砷黃鐵礦還原有關(guān),晚期的富硅質(zhì)流體對(duì)早期鈾礦石起著交代和品位貧化的作用,最終導(dǎo)致了分形尺度上的鈾成礦特征的不均一性。
[Abstract]:The middle section of the Zhuguang rock body is located in the middle of Nanling great igneous province, which is an important granitic uranium ore concentration area in China. The present study focused on the characteristics of arsenic-bearing pyrite and its relationship with uranium mineralization. It was identified by light slice under microscope, X-ray photoelectron spectroscopy (XPS) and cathodoluminescence (CL) were obtained by backscatter electron imaging. The microstructures, geochemical characteristics and mechanism of uranium reduction of pyrite in uranium ore have been studied by electron probe technique such as He-Ar isotope and electron structure analysis. The analysis shows that the pyrite associated with the asphaltene uranium deposit is granular arsenic-bearing pyrite, which was formed before uranium mineralization, and was replaced by siliceous and secondary uranium minerals during uranium mineralization. The results of electron probe main trace elements and He-Ar isotopic analysis show that pyrite is rich in As-rich in uranium, and the content of trace elements is in a large range, and the content of trace elements is enriched, such as Mo ~ (2 +) Cu ~ (2 +) Zn ~ (2 +) Pb ~ (2 +) SB, etc. The arsenic-bearing pyrite has a relatively high P _ 3He value and a ~ (40) Arn / n ~ (3 ~ (36) Ar) ratio. The electronic structure of arsenic-bearing pyrite obtained from the refined structure of crust and mantle mixed fluid. Rietveld structure formed in crustal fluid dominated by density functional theory shows that, Due to the addition of as to the valence band and conduction band near the Fermi energy level, the addition of as atoms is very active, which leads to the nature of the reduction of uranium. Based on the above understanding and the principle of soft and hard acid-base, the "three-stage" uranium mineralization process related to alkali and acid fluid interaction is discussed. It is considered that the early uranium mineralization is related to the reduction of arsenic-bearing pyrite. The late siliceous fluid plays an important role in the metasomatism and grade dilution of the early uranium ore, which leads to the heterogeneity of uranium metallogenic characteristics on fractal scale.
【作者單位】： 核工業(yè)二三0研究所;中國核工業(yè)地質(zhì)局;核工業(yè)北京地質(zhì)研究院;
【基金】：中國核工業(yè)集團(tuán)公司項(xiàng)目(編號(hào):LTD1602,3210402)的成果~~
【分類號(hào)】：P619.14

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