Study on Emerald-level Beryl from the Zhen'an W-Be Polymetallic Deposit in Shaanxi Province by Electron Probe Microanalyzer and Micro X-ray Diffractometer
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摘要: 南秦岭镇安地区发现了以白钨矿-绿柱石为矿石矿物组合的矿床新类型。为查明该矿床中首次发现的翠绿色祖母绿级绿柱石的致色机理并进一步揭示其成矿机制，本文在野外地质调查的基础上，对绿柱石开展了电子探针与微区X射线衍射等矿物学研究。结果表明：矿区中首次发现的祖母绿级绿柱石，呈自形晶产于石英（方解石）脉中并与白钨矿共（伴）生。祖母绿级绿柱石从核部至边缘V2O3含量较高，分别为0.64%~0.98%和1.04%~1.42%，且有增高趋势。X射线衍射数据表明区内祖母绿为“正常”绿柱石，同时存在Al↔Me2+和Be↔Li两种类质同象替换机制。V为本区祖母绿主要致色元素，来自于区内碳质板岩、金云母片岩及白云质大理岩等地层，Be、Si、Al等主要元素则来自于深部酸性岩浆岩。本次发现为该矿床中钨、铍矿产资源的综合开发利用提供了基础地质资料，并为南秦岭在区域及深部继续寻找稀有金属矿指出新的找矿方向。Abstract:
BACKGROUND A new deposit type with a scheelite-beryl-molybdenite assemblage was first discovered in the Zhen'an area of Shaanxi Province. BAOBJECTIVES The research on chromatic mechanism and genetic mechanism of emerald was carried out. METHODS Combined with the geological survey, Electron Microprobe and in-situ Micro X-ray Diffractomer were used to conduct mineral research. RESULTS The emerald mainly occurs in the quartz (calcite) veins as euhedral crystal and is associated with scheelite. Both the core and rim of the emerald with high V2O3 contents of 0.64%-0.98% and 1.04%-1.42%, respectively, show an increased V2O3 trend from core to rim. Diffraction data show that the emerald is normal beryl and has two kinds of isomorphous substitution mechanism, Al↔Me2+ and Be↔Li. Vanadium is the main coloring element of emerald and was mainly derived from carbonaceous slate, mica schist, and dolomitic marble, whereas Be, Si and Al were derived from deep acidic igneous rocks. CONCLUSIONS The discovery provides basic geological data for the comprehensive development and utilization of tungsten and antimony mineral resources in the deposit, and indicates new prospecting directions for continued searching for rare metal deposits in the region and deep areas of the South Qinling. -
Key words:
- emerald /
- mineralogy /
- coloring mechanism /
- W-Be polymetallics /
- Southern Qinling
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表 1 陕西镇安某地绿柱石的电子探针分析结果
Table 1. EMPA data of beryl in Zhen'an area, Shaanxi Province
元素 核部 边部 ZK1005-4 ZK1005-5 ZK1005-13 ZK1005-14 平均值 ZK1005-7 ZK1005-8 ZK1005-9 ZK1005-10 平均值 SiO2 66.40 67.34 66.40 67.49 66.91 66.57 66.48 66.01 66.53 66.40 Al2O3 16.86 16.72 16.46 17.02 16.77 16.30 15.92 16.20 16.19 16.15 Na2O 0.71 0.80 0.76 0.69 0.74 0.80 0.85 0.74 0.82 0.80 K2O 0.03 0.01 0.03 0.03 0.03 0.04 0.03 0.02 0.04 0.03 CaO 0.02 0.02 0.01 0.03 0.02 0.01 / 0.01 0.02 0.01 TiO2 0.08 0.01 / 0.10 0.05 / 0.06 / / 0.02 P2O5 / 0.01 0.007 / / 0.01 / / 0.01 0.01 MgO 1.22 1.27 1.44 1.34 1.32 1.49 1.48 1.43 1.53 1.48 MnO 0.01 0.04 / 0 0.01 0.02 0 0.05 0 0.02 FeO 0.24 0.26 0.3 0.14 0.24 0.32 0.35 0.31 0.41 0.35 Rb2O / / / / / / / / / / Cs2O 0.06 0.04 0.05 0.05 0.05 0.10 0.05 0.06 0.05 0.07 V2O3 0.64 0.84 0.98 0.68 0.79 1.07 1.42 1.13 1.04 1.17 Cr2O3 0.13 0.10 0.09 0.06 0.10 0.08 0.07 0.09 0.07 0.08 BeO 12.93 12.81 12.61 13.08 12.86 12.47 12.18 12.44 12.39 12.37 Li2O 0.70 0.75 0.74 0.68 0.72 0.78 0.79 0.70 0.78 0.76 总计 100.01 101.15 100.02 101.48 100.67 100.06 99.76 99.27 99.96 99.76 元素 ZK1005-4 ZK1005-5 ZK1005-13 ZK1005-14 平均值 ZK1005-7 ZK1005-8 ZK1005-9 ZK1005-10 平均值 Si 6 6 6 6 6 6 6 6 6 6 Al 1.8 1.76 1.758 1.788 1.777 1.736 1.697 1.74 1.726 1.725 Na 0.124 0.138 0.134 0.12 0.129 0.14 0.148 0.131 0.143 0.141 K 0.003 0.001 0.004 0.003 0.003 0.005 0.004 0.002 0.004 0.004 Ca 0.002 0.002 0.001 0.003 0.002 0.001 / 0.001 0.001 0.001 Ti 0.005 0.001 / 0.007 0.004 / 0.004 / / 0.004 P / 0.001 0.001 / 0.001 0.001 / / 0.001 0.001 Mg 0.165 0.169 0.194 0.178 0.177 0.201 0.2 0.195 0.206 0.201 Mn 0.001 0.003 / / 0.002 0.002 / 0.004 / 0.003 Fe 0.018 0.019 0.023 0.01 0.018 0.024 0.026 0.024 0.031 0.026 Rb / / / / / / / / / / Cs 0.002 0.002 0.002 0.002 0.002 0.004 0.002 0.002 0.002 0.003 V 0.047 0.06 0.071 0.049 0.057 0.078 0.103 0.083 0.075 0.085 Cr 0.009 0.007 0.007 0.004 0.007 0.006 0.005 0.007 0.005 0.006 Li 0.13 0.141 0.139 0.125 0.134 0.149 0.154 0.135 0.149 0.147 Be 2.87 2.859 2.861 2.875 2.866 2.851 2.846 2.865 2.851 2.853 Mg+Fe+Mn+Cr+V 0.24 0.258 0.295 0.241 0.259 0.31 0.334 0.312 0.317 0.318 Mg+Mn+Fe 0.184 0.191 0.217 0.189 0.195 0.227 0.226 0.222 0.237 0.228 Na+K+Rb+Cs 0.13 0.141 0.139 0.125 0.134 0.149 0.154 0.135 0.149 0.147 注：①测试单位为中国地质科学院矿产资源研究所电子探针实验室；②“/”表示低于检测限；③绿柱石的晶体化学式以6个硅原子为基础计算，Li和Be原子数分别根据Li=Na+K+Rb+Cs和Be=3-Li。 
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