湖南省双峰县大坪铷矿地球化学特征及成矿作用
发布时间：2018-12-18 16:04
【摘要】：大坪铷矿位于湖南省双峰县紫云山岩体中,铷矿体呈近东西向条带状产于紫云山复式花岗岩体顶部,是一处富铷花岗岩型稀有金属矿床。白云母花岗岩地球化学研究表明:主量元素具高SiO_2(73.27%~74.72%)、高分异指数DI(86.83~93.28),和高铝饱和指数(A/CNK=1.55~1.76),为高分异花岗岩及过铝质岩石,具较低的MgO(0.01%~0.36%)和TiO_2(0.01%~0.16%);微量元素富集Rb、Ta和Nb而强烈亏损Sr、Ba和Ti;稀土元素总量较低[w(∑REE)=8.24×10~(-6)~124.44×10~(-6)],具显著铕负异常(δEu=0.09~0.33),稀土元素配分图出现"M"型四分组效应。地球化学特征反映出紫云山复式花岗岩经历了高程度的分异演化过程,并在岩浆演化到晚期阶段F、H_2O等挥发分逐渐富集,由于F与稀有金属元素有较强的亲和力,形成络合物一起迁移和富集,当岩浆演化到晚期发生了熔体-流体不混溶作用稀有金属配合物被破坏,铷以类质同像形式在白云母花岗岩中富集成矿。
[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，
本文编号：2386089
[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，
本文编号：2386089
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