【摘要】：納嶺溝鈾礦床位于鄂爾多斯盆地東北部的伊陜單斜構(gòu)造區(qū),該區(qū)含礦主巖為中侏羅統(tǒng)直羅組下段下亞段。本文通過電子探針、能譜及背散射分析等方法,詳細(xì)研究了該區(qū)目的層砂巖的鈾礦物類型及其賦存形式,并對(duì)其礦物組合特征及期次等進(jìn)行了探討。結(jié)果表明納嶺溝地區(qū)鈾礦物主要為鈾石,還有少量的含鈦含鈾礦物、瀝青鈾礦、鈾釷石等。鈾礦物與黃鐵礦、蝕變鈦鐵礦、銳鈦礦/白鈦石、粘土礦物等密切共生,呈毛刺狀或微細(xì)柱狀產(chǎn)于礦物邊緣,或呈粒狀產(chǎn)于黑云母解理縫中,另外也見產(chǎn)于碎屑顆粒中。結(jié)合電子探針及背散射分析,對(duì)蝕變黑云母解理縫中黃鐵礦及鈾石成因、以及蝕變鈦鐵礦與鈾特殊關(guān)系進(jìn)行了初步探討。另外該區(qū)存在高Y和低Y元素兩種鈾石類型,瀝青鈾礦可能為原鈾礦物蝕變殘留,結(jié)合礦物蝕變期次,初步認(rèn)為該區(qū)含鈾砂巖至少遭受兩期不同成礦流體作用,多源流體耦合成礦可能是砂巖型鈾成礦的重要機(jī)制之一。
[Abstract]:The Naling Gou uranium deposit is located in the Yishan monoclinal tectonic area in the northeast of Ordos Basin. The main ore-bearing rock in this area is the lower submember of the lower member of the Zhiluo formation of the Middle Jurassic. By means of electron probe, energy spectrum and backscatter analysis, the uranium ore-forming types and their occurrence forms of the sandstone in the target layer in this area are studied in detail, and the mineral assemblages and their secondary stages are also discussed in this paper. The results show that uranium ore in Naling Gou area is mainly uranium stone, and a small amount of titanium bearing uranium ore, asphaltene uranium ore, uranium-thorium ore and so on. Uranium minerals are closely symbiotic with pyrite, altered ilmenite, anatase / white titanite, clay minerals, etc. They occur on the edge of the mineral or in granular form in biotite cleavage joints, and are also found in clastic particles. The origin of pyrite and uranium in altered biotite cleavage joint and the special relationship between altered ilmenite and uranium were discussed with electron probe and backscattering analysis. In addition, there are two types of uranium stone in this area, high Y and low Y elements, and the asphaltene uranium deposit may be the alteration residual of the original uranium deposit. Combined with the mineral alteration period, it is preliminarily considered that the uraniferous sandstone in this area has been subjected to at least two different metallogenic fluids. Multi-source fluid coupling metallogeny may be one of the important mechanisms of sandstone-type uranium mineralization.
【作者單位】： 中國地質(zhì)調(diào)查局天津地質(zhì)調(diào)查中心;中國地質(zhì)調(diào)查局天津地質(zhì)調(diào)查中心非化石能源礦產(chǎn)實(shí)驗(yàn)室;核工業(yè)208大隊(duì);
【基金】：國家重點(diǎn)基礎(chǔ)研究計(jì)劃973項(xiàng)目(編號(hào)2015CB453006) 國家青年自然科學(xué)基金(編號(hào)41502195) 中國地質(zhì)調(diào)查項(xiàng)目(編號(hào)DD20160127)聯(lián)合資助
【分類號(hào)】：P619.14

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