本文選題：礦物學(xué) + 鎂鐵-超鎂鐵質(zhì)巖體��； 參考：《巖石礦物學(xué)雜志》2017年04期

【摘要】：東天山造山帶與鎂鐵-超鎂鐵質(zhì)巖體有關(guān)的銅鎳硫化物礦床數(shù)量多,分布集中,是我國重要的銅鎳成礦帶之一。成礦巖體多以小巖體群形式產(chǎn)出,由西向東分布有白鑫灘、黃山和圖拉爾根3個巖體群,大型礦床主要賦存在黃山巖體群內(nèi)。本文對3個巖體群內(nèi)成礦巖體的主要造巖礦物進(jìn)行了系統(tǒng)的對比研究。成礦巖體的主要造巖礦物為貴橄欖石、古銅輝石、單斜輝石、斜長石和角閃石以及少量的鉻尖晶石和金云母。橄欖石Al溫度計計算結(jié)果表明,黃山巖體群內(nèi)成礦巖體的母巖漿結(jié)晶溫度介于1 143~1 257℃之間,略低于白鑫灘和圖拉爾根巖體群(1 283~1 301℃)。單斜輝石壓力計算表明成礦巖體的結(jié)晶壓力相似,介于0.31~0.33 GPa之間。成礦巖體中均富含含水礦物,且單斜輝石結(jié)晶早于斜長石,指示成礦巖體的原始巖漿形成于富水環(huán)境。成礦巖體的單斜輝石具有較高的Al/Ti值,鉻尖晶石和橄欖石具有與島弧火山巖相似的礦物學(xué)特征,結(jié)合區(qū)域構(gòu)造演化,認(rèn)為東天山鎂鐵-超鎂鐵質(zhì)成礦巖體的原始巖漿是被消減板片交代過的地幔部分熔融的產(chǎn)物。礦物學(xué)特征對比顯示了黃山巖體群內(nèi)成礦巖體更富斜方輝石和中性斜長石,且具有較低的鉻尖晶石Cr~#值和橄欖石Ca含量。結(jié)合前人研究成果和相關(guān)地球化學(xué)數(shù)據(jù),認(rèn)為相對高的混染程度導(dǎo)致了黃山巖體群的母巖漿富SiO_2和Al_2O_3,同時降低了巖漿的結(jié)晶溫度。
[Abstract]:The East Tianshan orogenic belt is one of the important copper-nickel metallogenic belts in China. The ore-forming rock mass is mostly in the form of small rock mass group, and from west to east there are three rock bodies groups: Baixintan, Huangshan and Tulargen. Large deposits mainly occur in Huangshan rock mass group. In this paper, the main rock-forming minerals of ore-forming rock bodies in three groups of rock masses are studied systematically and comparatively. The main rock-forming minerals of the ore-forming rock body are olivine, palaeopyroxene, clinopyroxene, plagioclase and hornblende, as well as a small amount of chromium spinel and phlogopite. The calculated results of olivine Al thermometer show that the crystallization temperature of the parent magma of the ore-forming rock body in Huangshan rock mass group is between 1 143 鈩，

本文編號：1835024