本文選題：硅質(zhì)巖　切入點(diǎn)：碳硅泥巖富鈾建造　出處：《核工業(yè)北京地質(zhì)研究院》2015年碩士論文

【摘要】：迭部鈾礦田是我國典型的碳硅泥巖型鈾礦田,區(qū)內(nèi)分布數(shù)個(gè)鈾礦床、礦點(diǎn)。這些礦床主要分布于志留紀(jì)地層中,并普遍顯示出構(gòu)造及地層控礦特征。筆者在前人研究的基礎(chǔ)上,對(duì)區(qū)內(nèi)志留紀(jì)碳硅泥巖建造進(jìn)行了詳細(xì)的野外地質(zhì)調(diào)研、鏡下觀察和掃描電鏡測試以及礦物學(xué)和地球化學(xué)分析,重點(diǎn)研究了碳硅泥巖富鈾建造中硅質(zhì)巖成因及鈾礦物在硅質(zhì)巖中的賦存狀態(tài),探討了碳硅泥巖富鈾建造的形成機(jī)理。通過論文工作,取得了以下主要成果和認(rèn)識(shí)。(1)巖石學(xué)、礦物學(xué)及地球化學(xué)研究顯示,研究區(qū)志留紀(jì)碳硅泥巖建造中的硅質(zhì)巖為熱水沉積成因。早-中志留世硅質(zhì)巖的形成古環(huán)境為具深大斷裂(裂谷)邊緣海環(huán)境,中志留世硅質(zhì)巖的形成古環(huán)境可能為具深大斷裂(裂谷)的邊緣海向小洋盆過渡環(huán)境。(2)地球化學(xué)分析表明,志留紀(jì)時(shí)期硅質(zhì)巖中的鈾部分來源于下伏中酸性火山巖,部分由陸源物質(zhì)帶入。(3)礦物學(xué)及掃描電鏡分析測試表明,硅質(zhì)巖中的鈾礦物是以瀝青鈾礦的形式存在的。鈾礦物局部與金屬硫化物共生共同被有機(jī)炭的變種炭質(zhì)(可能為石墨)所吸附,充填于石英顆粒中的微孔隙及微裂隙中。與鈾礦物共生的元素為Ni、Mo、V、As等元素。(4)以硅質(zhì)巖成因?yàn)榧s束條件,結(jié)合碳酸鹽巖、陸源碎屑巖形成理論及研究區(qū)構(gòu)造等前人研究成果,探討了碳硅泥巖富鈾建造的形成機(jī)理。
[Abstract]:Dibu uranium ore field is a typical carbon-silicon mudstone type uranium ore field in China. Several uranium deposits and ore sites are distributed in the area.These deposits are mainly distributed in Silurian strata and generally show structural and ore-controlling characteristics.On the basis of previous studies, detailed field geological investigation, microscopic observation, scanning electron microscopy, mineralogical and geochemical analysis of Silurian carbon-silicon mudstone formation were carried out in this area.The genesis of siliceous rocks and the occurrence of uranium minerals in siliceous rocks during the uranium-rich formation of carbon-siliceous mudstone are studied. The formation mechanism of uranium-rich formation of carbon-siliceous mudstone is discussed.Through the work of this paper, we have obtained the following main achievements and understandings. 1) Petrology, mineralogy and geochemistry show that the siliceous rocks in Silurian Carbonitic mudstone formation in the study area are of hydrothermal sedimentary origin.The paleoenvironment of early and Middle Silurian siliceous rocks is a marine environment with deep and large faults (rifts) margin.The Paleoenvironment of the Middle Silurian siliceous rocks may be the transitional environment of the marginal sea to the small ocean basin with deep and large faults (rift). Geochemical analysis shows that some of the uranium in Silurian siliceous rocks originated from the underlying intermediate-acid volcanic rocks.The results of mineralogy and SEM analysis show that the uranium ore in siliceous rocks exists in the form of asphaltene uranium ore.Uranium minerals are symbiosis with metallic sulfides and are adsorbed by the variant carbon (possibly graphite) of organic carbon and filled in micropores and fractures in quartz particles.The formation mechanism of uranium-rich formation of carbon-siliceous mudstone is discussed based on the formation theory of carbonate rock, continental clastic rock and the tectonics of the studied area.
【學(xué)位授予單位】：核工業(yè)北京地質(zhì)研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P619.14;P588.244

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