投稿时间：2021-03-15
修订日期：2022-08-01
网络发布日期：2022-11-08
中文摘要:南岭多金属成矿带中段南部的一六矿床新发现了花岗伟晶型的Be矿化。为进一步查明其矿化特征和成矿机制，文章对一六矿床中的绿柱石及共生的白云母开展了系统的矿物学和矿物化学研究。结果表明，绿柱石富集Li、Rb、Cs等，贫V、Cr、Mg、Mn，属于低碱-无碱绿柱石。云母的类型为白云母-多硅白云母，富集Li、W、Sn、Nb、Ta、Rb、Cs、Ba、Ga、Zn等元素，相对亏损Be、Mg、Cu、Pb等元素。绿柱石类质同象形式为Al3+→Me2+，其中Fe2+对Al3+的替换是绿柱石呈淡蓝色-蓝绿色的主要致色机制。白云母中稀有金属元素富集的机制为：① Li+AlVI↔Fe2++Mg（Li3Al-1□-1和Si2LiAl-3）；② Rb+↔K+，Na+。绿柱石中高Cs/Na（apfu）比值，低Mg/Fe（apfu）比值，白云母高Nb、Ta、Cs，低K/Rb、K/Cs比值的特征指示一六矿床Be矿化花岗伟晶岩具有较高的分异演化程度。本次发现和研究为区域Be矿化作用研究提供了基础地质资料，也进一步为稀有金属、钨等矿种的找矿预测提供了思路。
Abstract:Granitic pegmatite-type beryllium mineralization, firstly funded in the Yiliu deposit where is situated in southern part of the middle section of the Nanling polymetallic metallogenic belt. For the further investigation of the mineralization characteristics and metallogenic mechanism, this study focuses on the systematic mineralogy and chemistry of the beryl and associated muscovite. The results show that beryl is enriched in Si, Al, Fe, Li, Rb, Cs, Zn, but depleted in V, Cr, Mg, Mn. It belongs to low alkali—alkali-free beryl type. The type of white mica is mainly muscovite-phengite, which is enriched in Li, W, Sn, Nb, Ta, Rb, Cs, V, Ba, Ga, Zn, and relatively depleted in Mg, Cu, Pb. The isomorphic mechanism of beryl is Al3+↔Me2+, in which the substitution of Al3+ by Fe2+ dominated the formation of light blue- bluish green in colour of beryl. The enrichment mechanism of rare metal elements in muscovite is by ① Li+AlVI↔Fe2++Mg (Li3Al-1□-1 and Si2LiAl-3) and ② Rb+↔K+, Na+. The characteristics of high Cs/Na ratio and low Mg/Fe ratio in beryl, high contents of Nb, Ta, Cs and low ratios of K/Rb, K/Cs in muscovite indicate that the beryllium mineralized granitic pegmatite in the Yiliu deposit has a high degree of differentiation. This disco-very and study provided basic geological data for the characteristics of regional beryllium mineralization, and also provided a new insight for further prospecting of rare metals, tungsten and other metallic minerals.
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基金项目:本文得到国家社会科学基金重大项目“中国战略性三稀矿产资源供给风险治理机制研究”（编号：19ZDA111）和中国地质调查局“中国矿产地质志项目”（编号：DD20160346、DD20190379）共同资助
引用文本：
秦锦华,王成辉,陈毓川,赵如意.2022.南岭中段一六矿床绿柱石和白云母矿物学特征及其地质意义[J].矿床地质,41(5):1025~1041QIN JinHua,WANG ChengHui,CHEN YuChuan,ZHAO RuYi.2022.Mineralogical characteristics and geological significance of beryl and muscovite from Yiliu deposit in middle of Nanling metallogenic belt[J].Mineral Deposits41(5):1025~1041
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