本文選題：流體包裹體 + 稀有氣體同位素��； 參考：《吉林大學(xué)學(xué)報(地球科學(xué)版)》2017年05期

【摘要】：杜荒嶺和九三溝礦床是延邊地區(qū)兩個典型的淺成熱液高硫化型金礦床,兩者距離不足10km。本文運用顯微測溫、激光拉曼成分測試和稀有氣體同位素對這兩個礦床的蝕變巖和礦石中的石英內(nèi)流體包裹體進行研究,以便揭示成礦流體的起源和演化過程。測溫及拉曼測試結(jié)果表明:蝕變早期礦化階段主要氣體成分為CO_2、N_2的兩相流體包裹體,發(fā)育少量高鹽度(33.4%~48.1%)高溫(410~470℃)的流體包裹體,其為深部斑巖成礦系統(tǒng)與后期淺成礦化流體疊加的產(chǎn)物;主成礦階段均一溫度為90~330℃,鹽度為0.4%~44.9%,成分以H2O為主,含少量的CO_2;富氣相、富液相及含石鹽子晶多相的流體包裹體共存,表明流體發(fā)生了沸騰作用,這些流體包裹體被捕獲的深度為100~500 m,代表淺成礦化的主要流體。稀有氣體同位素結(jié)果表明:3 He/4 He值為0.009 6~0.020 6Ra,20 Ne/22 Ne、21 Ne/22 Ne值分別為9.734~9.987和0.030 9~0.040 6,40 Ar/36 Ar為1 302.4~4 433.6。上述研究結(jié)果表明,延邊地區(qū)杜荒嶺和九三溝金礦早期成礦流體為攜帶Au、Ag、Cu等成礦元素的高溫、高氧化的巖漿氣,主成礦階段地殼流體的混入導(dǎo)致沸騰作用,晚期轉(zhuǎn)以低溫低鹽度的大氣水為主。
[Abstract]:Duhuangling and Jiusangou deposits are two typical epithermal high sulphide gold deposits in Yanbian area with a distance of less than 10km. In this paper, the fluid inclusions in alteration rocks and ores of these two deposits are studied by means of microthermometry, laser Raman spectroscopy and rare gas isotopes in order to reveal the origin and evolution of ore-forming fluids. The results of temperature measurement and Raman measurement show that the main gas composition in the early mineralization stage of the alteration is the two-phase fluid inclusions of CO _ 2O _ 2N _ T _ 2, and a small amount of fluid inclusions with high salinity of 33.4% and 48.1 鈩，

本文編號：2001202