本文選題：諸廣巖體 + 百順礦田　； 參考：《東華理工大學(xué)》2015年碩士論文

【摘要】：百順礦田位于諸廣巖體南部,是華南花崗巖型鈾礦的典型代表。本文在野外地質(zhì)調(diào)查、取樣和分析的基礎(chǔ)上,結(jié)合前人的研究成果,系統(tǒng)分析了區(qū)內(nèi)主要鈾礦床的主量、微量、稀土元素,氫、氧、碳、硫以及鉛等同位素的組成特征,對百順鈾礦田礦床的成礦流體和成礦物質(zhì)來源進(jìn)行了探討,主要取得了以下幾點(diǎn)認(rèn)識:(1)對比圍巖花崗巖、近礦蝕變巖石、富礦石以及輝綠巖的主量元素組成,發(fā)現(xiàn)他們之間存在著一定的規(guī)律性,礦石中的物質(zhì)成分對圍巖有良好的繼承性,其主量元素組成與花崗巖關(guān)系更相似,而與輝綠巖明顯不同,這表明礦石與花崗巖的組成物質(zhì)具有同源性;稀土、微量元素分析顯示,區(qū)內(nèi)花崗巖U含量較高,有較強(qiáng)供鈾能力;對比礦田內(nèi)不同地質(zhì)體的稀土、微量元素組成,花崗巖、蝕變巖、碎粉巖、硅質(zhì)脈、富礦石的微量元素標(biāo)準(zhǔn)化曲線一致性較好,但與輝綠巖脈差異明顯,認(rèn)為成礦物質(zhì)很來自圍巖花崗巖;(2)采集了區(qū)內(nèi)多個(gè)礦床和礦點(diǎn)中無礦化新鮮輝綠巖、含礦破碎輝綠巖、含礦硅質(zhì)脈以及花崗質(zhì)碎裂巖富礦石等24個(gè)黃鐵礦樣品,并測試了樣品中黃鐵礦的硫同位素組成,其中富礦石中黃鐵礦的δ34SCDT值為-18.9‰~-17.3‰,破碎的礦化輝綠巖為-6.5‰~-10.9‰,兩者與新鮮輝綠巖中黃鐵礦的δ34SCDT值(-0.5‰~-0.2‰)明顯不同,表明成礦流體中硫來自幔源的可能性很小,而與花崗巖中的硫或生物成因硫一致;(3)收集了41個(gè)樣品的氫氧同位素?cái)?shù)據(jù),δD-δ18OH2O投圖結(jié)果顯示所有氫、氧同位素值均落于地幔水、巖漿水、變質(zhì)水與大氣降水線之間,進(jìn)一步判別表明成礦流體來自大氣降水;(4)測試的30個(gè)方解石樣品的碳同位素分析表明,各礦床成礦期流體的δ13CPDB值為-10.25‰~-4.56‰,接近于華南花崗巖或地幔碳同位素組成,進(jìn)一步的碳氧同位素投圖表明碳也可以來自花崗巖;(5)富礦石和花崗巖的鉛同位素組成特征顯示它們均來自上地殼。綜上所述,百順鈾礦田的成礦物質(zhì)和流體可能主要來源于大氣降水沿深大斷裂的循環(huán)并萃取圍巖花崗巖中各種成礦元素而形成。
[Abstract]:The Baishun Orefield is located in the southern part of the Guang rock mass and is a typical representative of the granitic uranium deposits in South China. On the basis of field geological survey, sampling and analysis, and combining with the previous research results, this paper systematically analyses the main quantities, trace, rare earth elements, hydrogen, oxygen, carbon, sulfur and lead isotopes of the main uranium deposits in the area. The source of ore-forming fluid and ore-forming material in the Beshun uranium ore field is discussed. The main contents of ore-forming fluids and ore-forming materials in the Beshun uranium deposit are compared as follows: (1) the main elements of the surrounding rock granite, the near-ore altered rock, the rich ore and the diabase. It is found that there is a certain regularity between them. The mineral composition in the ore has a good inheritance to the surrounding rock, and its principal element composition is more similar to that of the granite, but it is obviously different from the diabase. The analysis of rare earth elements and trace elements shows that the U content of granites in the area is relatively high and the uranium supply ability is strong, and the composition of rare earth, trace elements, granites, and granites in different geological bodies in the ore field are compared with each other. The standardized curves of trace elements in altered rocks, crushed rocks, siliceous veins and rich ores are consistent, but are different from those of diabase veins. It is considered that the ore-forming material is derived from the surrounding rock granitoids.) Twenty-four samples of pyrite, such as non-mineralized fresh diabase, ore-bearing broken diabase, ore-bearing siliceous vein and granitic clastic rock rich ore, have been collected from several deposits and ore sites in the area. The sulfur isotopic compositions of pyrite in the samples were tested. The 未 34SCDT values of pyrite in rich ores were -18.9 鈥，

本文編號：1805529