【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于紫云山復式花崗巖體頂部,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)],具顯著銪負異常(δEu=0.09~0.33),稀土元素配分圖出現(xiàn)"M"型四分組效應。地球化學特征反映出紫云山復式花崗巖經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的親和力,形成絡合物一起遷移和富集,當巖漿演化到晚期發(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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