本文關(guān)鍵詞： 礦物化學(xué) 巖石成因 成礦作用 九龍腦礦田 花崗巖　出處：《地學(xué)前緣》2017年05期 　論文類型：期刊論文

【摘要】：九龍腦巖體位于南嶺成礦帶東段崇余猶礦集區(qū)內(nèi),是由四個期次花崗巖組成的復(fù)式巖體,從早到晚分別為中粗粒黑云母花崗巖(γ2-1a5)、中粗粒斑狀(含白云母)黑云母花崗巖(γ2-1b5)、細(xì)-中細(xì)粒斑狀黑云母花崗巖(γ2-2a-2b5)、細(xì)-中細(xì)粒(含黑云母、石榴石)花崗巖(γ25),以其為中心,鎢錫、金銀銅鉛鋅、鈾、鈮鉭等多礦種、多期次、多成因礦床分帶產(chǎn)出。通過對花崗巖的礦物學(xué)研究,確定九龍腦花崗巖中的鉀長石以正長石為主,斜長石為鈉-更長石,黑云母為富鐵黑云母-鐵葉云母-鋁鐵葉云母,原生白云母較次生白云母具有高鐵、錳、鎂、氟、氯和低鋁特征,石榴石屬于錳鋁榴石-鐵鋁榴石,綠泥石為鮞綠泥石-蠕綠泥石(鐵綠泥石)-鐵鎂綠泥石,副礦物中常含微量的稀有金屬元素。原生白云母和鈦鐵礦的存在以及黑云母礦物化學(xué)特征指示九龍腦花崗巖為S型花崗巖。第一期次花崗巖結(jié)晶時具有較高的氧逸度,其黑云母結(jié)晶溫度為550~600℃;第二、三、四期次花崗巖結(jié)晶時具有相對較低的氧逸度,其黑云母結(jié)晶溫度分別為600~700℃、600~700℃、550℃。第一、三、四期次花崗巖中綠泥石的形成溫度分別為385~400℃、300~370℃、359~397℃,顯示九龍腦花崗巖經(jīng)歷了中高溫?zé)嵋毫黧w的影響。礦物化學(xué)特征表明,九龍腦花崗巖與南嶺地區(qū)成鎢錫鉬鉍礦的花崗巖具有相似的礦物組成,第一期次、第二期次、第四期次花崗巖可能與礦田內(nèi)豐富的鎢、錫、鈮鉭、鈾礦化密切相關(guān)。
[Abstract]:The Jiulongnao rock body, located in the Chongyu ore concentration area of the eastern section of the Nanling metallogenic belt, is a complex rock body consisting of four sub-granites, from early to late, it is a medium-coarse biotite granite (緯 _ 2-1a _ 5). Medium-coarse porphyry (including Muscovite) biotite granite (緯 2-1b5U), fine-grained porphyry biotite granite (緯 2-2a-2b5U), fine-medium grained biotite (including biotite). Garnet) granites (緯 25s, centered around it, with tungsten, tin, gold, silver, copper, lead and zinc, uranium, niobium and tantalum, etc. It is determined that the potassium feldspar is mainly orthoclase, the plagioclase is sodium-feldspar, the biotite is iron-rich biotite-iron leaf mica-aluminopite, and the primary Muscovite has higher iron and manganese than secondary Muscovite. The characteristics of magnesium, fluorine, chlorine and low aluminum are that garnet belongs to manganese aluminite-iron aluminite, and chlorite is oolitic chlorite-vermicular chlorite (iron chlorite-iron magnesium chlorite). The presence of primary Muscovite and ilmenite, as well as the chemical characteristics of biotite minerals, indicate that the Jiulongnao granite is S-type granite. Fugacity. The crystallization temperature of biotite is 550 鈩，

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