【摘要】：大坪銣礦位于湖南省雙峰縣紫云山巖體中,銣礦體呈近東西向條帶狀產(chǎn)于紫云山復(fù)式花崗巖體頂部,是一處富銣花崗巖型稀有金屬礦床。白云母花崗巖地球化學(xué)研究表明:主量元素具高SiO_2(73.27%~74.72%)、高分異指數(shù)DI(86.83~93.28),和高鋁飽和指數(shù)(A/CNK=1.55~1.76),為高分異花崗巖及過鋁質(zhì)巖石,具較低的MgO(0.01%~0.36%)和TiO_2(0.01%~0.16%);微量元素富集Rb、Ta和Nb而強(qiáng)烈虧損Sr、Ba和Ti;稀土元素總量較低[w(∑REE)=8.24×10~(-6)~124.44×10~(-6)],具顯著銪負(fù)異常(δEu=0.09~0.33),稀土元素配分圖出現(xiàn)"M"型四分組效應(yīng)。地球化學(xué)特征反映出紫云山復(fù)式花崗巖經(jīng)歷了高程度的分異演化過程,并在巖漿演化到晚期階段F、H_2O等揮發(fā)分逐漸富集,由于F與稀有金屬元素有較強(qiáng)的親和力,形成絡(luò)合物一起遷移和富集,當(dāng)巖漿演化到晚期發(fā)生了熔體-流體不混溶作用稀有金屬配合物被破壞,銣以類質(zhì)同像形式在白云母花崗巖中富集成礦。
[Abstract]:Daping rubidium ore deposit is located in Ziyunshan rock body of Shuangfeng County Hunan Province. The rubidium ore body is near east-west stripe on the top of Ziyunshan composite granite body and is a rubidium rich granite type rare metal deposit. Geochemical studies of Muscovite granites show that the main elements are of high SiO_2 (73.27%), DI (86.83%), and high aluminum saturation index (A/CNK=1.55~1.76). It is a highly differentiated granite and peraluminous rock with relatively low MgO (0.01% 0.36%) and TiO_2 (0.01% 0.16%). Trace elements are enriched in Rb,Ta and Nb and strongly depleted in Sr,Ba and Ti; The total amount of rare earth elements is relatively low [w (鈭，

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