本文選題：鎂鐵超鎂鐵巖 + SSZ型蛇綠巖　； 參考：《礦物巖石地球化學(xué)通報(bào)》2017年01期

【摘要】：為探討新疆北天山古生代大地構(gòu)造格架及其演化,對(duì)吐哈盆地南緣古生代天窗新發(fā)現(xiàn)的大草灘北鎂鐵-超鎂鐵巖進(jìn)行了地球化學(xué)和U-Pb定年研究。結(jié)果表明,該鎂鐵質(zhì)-超鎂鐵質(zhì)巖石由玄武巖、輝長(zhǎng)巖、輝橄巖、輝石巖和蛇紋石化超基性巖組成。其輕稀土富集、重稀土相對(duì)虧損,有較弱的同化混染作用,玄武巖具有島弧火山巖和洋中脊火山巖雙重特性,可能與康古爾蛇綠巖一樣產(chǎn)于弧后盆地環(huán)境的蛇綠巖(SSZ型)。本次研究獲得的輝長(zhǎng)巖的LA-ICP-MS鋯石~(206)Pb/U~(238)年齡為416.5±4 Ma,為晚志留世,說明古亞洲洋初始主碰撞持續(xù)到志留紀(jì)晚期。
[Abstract]:In order to study the geotectonic framework and its evolution in the Paleozoic in North Tianshan Mountains in Xinjiang , the authors have conducted geochemical and U - Pb dating studies on the newly discovered heavy rare earth iron - ultramamagmatite in the southern margin of the Tuha basin . The results show that the Mg - Fe - Mg - Fe - Mg - Fe - Mg - Fe - Mg - Fe - rock consists of basalt , gabbro , fazite , pyroxenite and serpentine ultrabasic rock . The results show that the zircon - MS zircon - ( 206 ) Pb / U ~ ( 238 ) age of the gabbro is 416.5 鹵 4 Ma , which indicates that the initial main collision of the ancient Asian ocean continued to the later stage .

【作者單位】： 新疆維吾爾自治區(qū)地質(zhì)調(diào)查院;新疆地質(zhì)礦產(chǎn)局;
【基金】：中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(12120114059201)
【分類號(hào)】：P597.3;P588.1

【參考文獻(xiàn)】

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