本文關(guān)鍵詞： 峨眉山玄武巖 地幔柱 自然銅 流體包裹體 拉一木　出處：《現(xiàn)代地質(zhì)》2016年03期 　論文類型：期刊論文

【摘要】：揚(yáng)子地臺西南緣形成的大面積自然銅礦化是峨眉地幔柱成礦系統(tǒng)的重要組成部分。以四川省昭覺縣拉一木玄武巖銅礦流體包裹體為研究對象,通過與自然銅礦共生的石英和方解石中各類型包裹體測定,將該自然銅礦成礦過程劃分為兩個階段,其中早階段成礦流體具有中-低溫、高鹽度的盆地?zé)猁u水與有機(jī)流體的混合作用特征,流體組成為H_2O,含少量甲烷、烴類及瀝青,液態(tài)烴以熒光性強(qiáng)的芳烴為主,包裹體均一溫度140~306℃,w(NaCl)值分布在3%~10%、11%~14%、21%~24%三個區(qū)間,平均鹽度為8.6%;晚階段流體表現(xiàn)為低溫低鹽度特征,均一溫度80~190℃,w(NaCl)值0.2%~8%,平均值4.8%,表明流體是由地表下滲的大氣降水經(jīng)水巖反應(yīng)后轉(zhuǎn)變而成。研究區(qū)自然銅礦流體包裹體與滇東北昭通地區(qū)玄武巖銅礦流體包裹體特征基本一致。無機(jī)物與有機(jī)物反應(yīng)、地幔流體促成不同類型流體與其混合以及缺硫條件和有機(jī)質(zhì)的還原作用是導(dǎo)致本區(qū)自然銅沉淀富集成礦的主要機(jī)制。
[Abstract]:A large area of natural copper mineralization in the southwestern margin of the Yangtze platform is an important part of the mantle plume metallogenic system in Emei. The fluid inclusions of the Tarim basalt copper deposit in Zhaojue County Sichuan Province are studied. Through the determination of the inclusions in quartz and calcite coexisting with the natural copper deposit, the metallogenic process of the natural copper deposit is divided into two stages, in which the ore-forming fluid in the early stage is of medium-low temperature. The mixing characteristics of hot brine and organic fluids in high salinity basin are characterized by the composition of H _ 2O, containing a small amount of methane, hydrocarbons and bitumen, the liquid hydrocarbon being mainly aromatics with strong fluorescence, the homogenization temperature of inclusions at 140 ~ 306 鈩，

本文編號：1503024