本文選題：成礦機理　切入點：成礦模式　出處：《高校地質(zhì)學(xué)報》2017年02期

【摘要】：文章對納米比亞歡樂谷地區(qū)白崗巖型鈾礦的鈾礦物學(xué)、成礦期次、主要控礦因素、成礦物質(zhì)來源及成礦機理等進(jìn)行了系統(tǒng)的研究,認(rèn)為白崗巖型鈾礦受到構(gòu)造、巖性、地層、基性巖脈和后期熱液活動等因素的綜合控制。礦體主要產(chǎn)于褶皺的拐彎處、穹窿邊緣及構(gòu)造變異(轉(zhuǎn)折、膨大)部位,這些構(gòu)造為鈾礦化提供了充足的賦存空間;同時千歲蘭區(qū)域性斷裂為鈾的活化遷移提供了通道;在巖性方面,礦化白崗巖具有專屬性,只有D、E型白崗巖成礦,其他類型白崗巖不成礦,而且礦化白崗巖主要侵入于卡里畢比組和卡塞布組;后期流體也對鈾成礦具有疊加改造作用,該期鈾礦化與侏羅紀(jì)基性巖漿的侵入密切相關(guān)。另外經(jīng)研究發(fā)現(xiàn),白崗巖型鈾礦主成礦期鈾來源于富鈾的前達(dá)馬拉基底,熱液疊加改造期的鈾可能來自于原生鈾礦物本身,據(jù)此構(gòu)建了一個全新的四階段三期的"四維"成礦模式。
[Abstract]:In this paper, the uranium mineralogy, metallogenic stage, main ore-controlling factors, ore-forming source and metallogenic mechanism of the Baigangyan type uranium deposit in Huanle Valley area, Namibia, are systematically studied. It is considered that the Baigangyan type uranium deposit is subjected to structure, lithology and formation.Comprehensive control of basic vein and hydrothermal activity in late stage.The orebody mainly occurs at the bend of the fold, the margin of the dome and the position of tectonic variation (transition, enlargement), these structures provide ample space for uranium mineralization, and the regional faults of thousand years old provide a channel for the activation and migration of uranium.In the aspect of lithology, the mineralized Baigang rock has a special attribute, only the DGE-type Baigang rock is metallogenic, and the other types of Baigang rock are not metallogenic, and the mineralized Baigang rock mainly intrudes into the Karibibi formation and the Casebuk formation.The late fluid also has superimposed and modified uranium mineralization, which is closely related to the intrusion of Jurassic basic magma.In addition, it has been found that the uranium in the main metallogenic period of the Baigangyan type uranium deposit originated from the pre-Damara basement rich in uranium, and that the uranium during the hydrothermal superposition transformation period may come from the primary uranium ore itself.Based on this, a new four-stage and three-stage "four dimensional" metallogenic model is constructed.
【作者單位】： 核工業(yè)北京地質(zhì)研究院;中核鈾資源勘查與評價技術(shù)重點實驗室;
【基金】：非洲中南部古老地塊鈾礦綜合識別評價技術(shù)及應(yīng)用研究項目
【分類號】：P619.14

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