本文關(guān)鍵詞： 花崗閃長斑巖 黑云母地球化學(xué) 氧逸度 成巖成礦作用 殼�；旌�　出處：《巖石礦物學(xué)雜志》2017年03期 　論文類型：期刊論文

【摘要】：通過對金雞窩銅礦區(qū)花崗閃長斑巖進行詳細的巖相學(xué)研究和黑云母成分的電子探針原位分析,厘定了黑云母形成的物理化學(xué)條件,并探討了其成巖成礦意義。電子探針研究顯示:花崗閃長斑巖中黑云母的Ti為0.44~0.47apfu,Mg/(Mg+Fe)比值范圍為0.58~0.62,結(jié)合其化學(xué)成分在10 TiO_2-Fe O*-Mg O圖解和Mg-(Fe2++Mn)-(AlⅥ+Fe3++Ti)圖解中的投影,認為該巖體中黑云母具有富鎂貧鐵特征,屬于原生黑云母。黑云母氧化系數(shù)(fO)范圍為0.31~0.67,MF值范圍為0.38~0.41,Mg O含量為13.27%~14.28%,K2O為3.59%~8.93%,Na2O為0.26%~3.28%,Fe O為15.74%~17.30%,TiO_2為3.93%~4.19%,Al2O3為13.52%~14.19%,單位分子中陽離子數(shù)AlⅣ為2.00~2.24 apfu,AlⅥ為0.15~0.41 apfu,指示其巖體屬于高鉀質(zhì)鈣堿性系列的同熔型(或I型)花崗巖,具有殼�；煸闯梢虻奶卣�。黑云母結(jié)晶溫度為734~748℃,結(jié)晶壓力為71~89 MPa,相當(dāng)于深度2.7~3.3 km,平均深度為3.0 km。黑云母化學(xué)成分投點主要落在Fe2O3-Fe3O4緩沖線之上,表明其形成于高氧逸度環(huán)境,且有利于銅礦的形成。
[Abstract]:The physical and chemical conditions of biotite formation were determined by detailed petrographic study and in situ electron probe analysis of biotite composition in the granodiorite porphyry of the Jinjiwo copper deposit. The significance of diagenesis and metallogenesis was also discussed. Electron probe study showed that the Ti ratio of biotite in granodiorite was 0.44 ~ 0.47 apfu-mg-Fe0.580.580.62, and the projection of its chemical composition in 10 TiO_2-Fe OOMg-O diagram and Mg-(Fe2 Mn)-(Al 鈪，

本文編號：1511813