【摘要】：云南因民鐵銅礦區(qū)次火山雜巖主要由鐵質熔巖、輝綠巖、輝長輝綠巖、火山集塊巖、火山角礫巖、熱液角礫巖等組成,巖相分帶明顯,熱液蝕變與礦化關系密切。通過對次火山雜巖中不同巖相的黑云母和綠泥石電子探針結果分析得出,黑云母為鎂質黑云母,大多數(shù)為再平衡黑云母,形成溫度為505~590℃,lgf(O2)為-12.4~-5.25,壓力為116~226 MPa,推測成巖深度為4.27~8.37 km,屬于高溫強氧化環(huán)境;綠泥石為密綠泥石、蠕綠泥石、透綠泥石、葉綠泥石,形成溫度為170~235℃,lgf(O2)為-51.93~-43.70,lgf(S2)為-13.34~-2.50,屬于中低溫強還原環(huán)境。礦物產(chǎn)狀、礦物組合與礦物中主要陽離子關系顯示,兩種礦物均具有多期多源性的特征。黑云母化蝕變代表鐵礦的主成礦期,綠泥石化蝕變代表銅礦的主成礦期;多期次構造-巖漿-熱事件形成了高-中低溫的堿性強還原流體,疊加改造富集鐵銅礦床,揭示了本區(qū)次火山雜巖是鐵銅礦床穩(wěn)定持續(xù)性成礦元素的供給系統(tǒng)。
[Abstract]:The subvolcanic complex is mainly composed of iron lava, diabase, pyroxenite, volcanic breccia, hydrothermal breccia and so on. The lithofacies zoning is obvious, and the hydrothermal alteration is closely related to mineralization. The results of electron probe analysis of biotite and chlorite in different lithofacies of subvolcanic complex show that biotite is magnesia biotite, most of which are rebalanced biotite. The formation temperature is -12.4mg-5.25, the formation temperature is 505U 590 鈩，

本文編號：2182468