本文選題：礦物學(xué) + 穩(wěn)定同位素�。� 參考：《地學(xué)前緣》2017年06期

【摘要】：本文研究了中甸弧南段紅山—紅牛銅礦主要夕卡巖礦物石榴石和輝石成因礦物學(xué)特征,顯示礦區(qū)石榴石為鈣鐵-鈣鋁石榴石系列,早期多為鈣鐵榴石,晚期為鈣鋁榴石。礦區(qū)部分石榴石在背散射光下可以觀察到明顯的環(huán)帶結(jié)構(gòu),鈣鋁榴石和鈣鐵榴石含量差別越大環(huán)帶越明顯。礦區(qū)輝石主要為次透輝石和少量的透輝石,表明夕卡巖早期成礦流體為高溫、酸性和高氧逸度環(huán)境。礦區(qū)黃鐵礦強(qiáng)富鐵虧硫且Co/Ni1,黃銅礦S、Fe和Cu含量較穩(wěn)定只含有少量的C、Ni和Se,均指示為高溫巖漿熱液成因。金屬硫化物34S眾值出現(xiàn)在3.8‰~5.6‰,同時(shí)代的石英二長斑巖34S在4.7‰~7.8‰,表明硫主要來自石英二長斑巖。金屬礦物和石英二長斑巖鉛同位素特征表明,鉛主要來自上地殼。石榴石δ~(18)O_(V-SMOW)=6‰~8.8‰,成礦流體δ~(18) OH_2O=4.6‰~7.8‰,反映成礦流體主要來自巖漿熱液,且成礦流體存在明顯的沸騰作用。夕卡巖礦體中的方解石和圍巖方解石C-O同位素研究,指示塊狀硫化物中的方解石來自巖漿流體,含有硫化物細(xì)脈的圍巖大理巖中的方解石來自圍巖的再結(jié)晶作用。
[Abstract]:The mineralogical characteristics of the major skarn minerals garnet and pyroxene in Hongshan-Hongniu Copper Mine in the southern segment of Zhongdian arc have been studied in this paper. It is shown that garnet is a series of calcium iron and calcium aluminum garnet, most of which are calcium iron garnet in the early stage and calcium aluminum garnet in the late stage. The ring structure of some garnet in mining area can be observed under backscattering light. The larger the difference between calcium aluminite and calcium iron garnet is, the more obvious the ring zone is. The pyroxene is mainly subdiopside and a small amount of diopside which indicates that the early skarn ore-forming fluid is high temperature acid and high oxygen fugacity environment. Pyrite is rich in iron and sulfur, and the contents of Fe and Cu in chalcopyrite are stable, and only a small amount of Ni and See are found, indicating the origin of high temperature magmatic hydrothermal solution. The results show that the metal sulfides (34s) appear in the range of 3.8 鈥，

本文編號(hào)：1886498