本文選題：流體包裹體 + 礦床地質(zhì)��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：胡村南銅鉬礦床是在安徽銅陵銅(金)礦集區(qū)中發(fā)現(xiàn)的第一個(gè)矽卡巖-斑巖復(fù)合型銅鉬礦床,在長江中下游成礦帶具有特殊性和典型性。本文對該礦床進(jìn)行了礦床地質(zhì)和成礦流體地球化學(xué)研究,旨在查明該礦床的流體成礦過程。胡村南銅鉬礦床流體成礦過程可以劃分為高溫氣成熱液期、中高溫?zé)嵋浩诤偷蜏責(zé)嵋浩谌齻�(gè)成礦期。高溫氣成熱液期發(fā)育鉀長石化和矽卡巖化,中高溫?zé)嵋浩诎l(fā)育綠泥石化、綠簾石化和絹云母化,而低溫?zé)嵋浩谥饕l(fā)育碳酸鹽化。其中中高溫?zé)嵋浩跒橹饕V化期,形成輝鉬礦和黃銅礦等多種硫化物網(wǎng)脈。高溫氣成熱液期礦物中發(fā)育富液相和含子晶多相包裹體,中高溫?zé)嵋浩诘V物中也主要發(fā)育富液相包裹體和含子晶多相包裹體,但可見少量的富氣相包裹體,低溫?zé)嵋浩诘V物中只發(fā)育富液相包裹體。從高溫氣成熱液期經(jīng)中高溫?zé)嵋浩诘降蜏責(zé)嵋浩?成礦流體均一溫度從435℃以上經(jīng)203~458℃降低到156~276℃,鹽度從14.0%~64.9%Na Cleq經(jīng)4.6%~47.5%Na Cleq降低到1.0%~15.5%Na Cleq。從早期到晚期,成礦流體從高溫、高壓、高鹽度流體向低溫、低壓、低鹽度流體演化。礦化主要發(fā)生在中高溫?zé)嵋浩谑?輝鉬礦階段和石英-黃銅礦階段,成礦深度為0.6~1.5km。氫氧同位素分析表明,中高溫?zé)嵋浩诟鞒傻V階段成礦流體均為巖漿水,到低溫?zé)嵋浩谔妓猁}階段有大氣降水混入。碳氧同位素反映碳可能主要來自殼�；煸磶r漿,并有海相碳酸鹽溶解成分的加入。地質(zhì)和地球化學(xué)綜合分析表明,成礦流體在演化過程中發(fā)生過不混溶作用、沸騰作用和混合作用。不混溶作用發(fā)生在氣成熱液期,使成礦流體中的成礦元素大量富集。沸騰作用發(fā)生在中高溫?zé)嵋浩?導(dǎo)致成礦流體中的成礦元素卸載而沉淀出大量金屬硫化物�；旌献饔弥饕l(fā)生在低溫?zé)嵋浩?使流體的溫度和鹽度進(jìn)一步降低。
[Abstract]:Hucuonnan copper and molybdenum deposit is the first skarn porphyry compound copper molybdenum deposit found in Tongling copper (gold) concentration area of Anhui Province. It is special and typical in the middle and lower reaches of the Yangtze River metallogenic belt. In this paper, ore deposit geology and ore-forming fluid geochemistry are studied in order to find out the fluid metallogenic process of the deposit. The fluid metallogenic process of Hucuonnan Cu-Mo deposit can be divided into three stages: high temperature gas hydrothermal stage, middle high temperature hydrothermal period and low temperature hydrothermal stage. Potassium feldspar and skarn were developed in high temperature gas forming hydrothermal period, green mud petrification, green curtain petrification and sericite in middle high temperature hydrothermal period, and carbonation in low temperature hydrothermal period. The high temperature hydrothermal stage is the main mineralization stage, forming various sulphide net veins such as molybdenum and chalcopyrite. There are rich liquid phase inclusions and sub-crystalline polyphase inclusions in the minerals of high temperature gas-forming hydrothermal period, and liquid rich inclusions and sub-crystalline polyphase inclusions are mainly developed in the middle and high temperature hydrothermal period minerals, but a small amount of gas-rich inclusions are found in the minerals. Only liquid-rich inclusions are developed in the minerals during the low temperature hydrothermal period. The homogenization temperature of the ore-forming fluid decreased from 435 鈩，

本文編號：1961538