Mineralogical Characteristics of Spodumene in No. VIII Pegmatite Vein of Dangba Spodumene Deposit, Sichuan
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摘要:
采用显微镜下观察、电子探针（EPMA）、激光剥蚀等离子质谱（LA-ICP-MS）和X射线衍射分析（XRD）等测试手段对四川党坝锂辉石矿床VIII号脉锂辉石的矿物学特征开展了详细研究。结果显示，锂辉石是主要的矿石矿物，锂辉石晶体粒度较粗大，锂主要赋存于锂辉石中，伴生有铌、钽等有益组分。XRD和LA-ICP-MS分析显示，锂辉石的纯度很高（Li2O平均含量7.84%），晶胞参数略小于标准卡片的晶胞参数。电子探针分析结果显示，锂辉石中SiO2含量较高（65.62%~65.82%），含有少量的Fe和Mn等杂质。矿石中Li2O含量达到1.33%。综合分析该锂矿具有重要的开发利用价值。
Abstract:Systematic research of mineralogical characteristics of spodumene of VIII pegmatite vein in Dangba spodumene deposit are studied by microscopic observation, electron probe micro analysis (EPMA), Laser ablation plasma mass spectrometry（LA-ICP-MS）and X-ray diffraction analysis (XRD). The results show that the main ore mineral is spodumene. The spodumene crystal partical is large, lithium mainly occurs in spodumene, accompanied by niobium and tantalum beneficial components. XRD and LA-ICP-MS analysis show that the purity of spodumene is very high（the average contentof Li2O is 7.84%）and the cell parameters are slightly lower than those of standard cards. The EPMA results show that the content of SiO2 in spodumene was high (65.62%~65.82%), with a small amount of impurities such as Fe and Mn. The contents of Li2O in the pegmatite ore is up to 1.33%. To sum up, the lithium ore has important development and utilization value.
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Key words:
- Mineralogy /
- Spodumene /
- Comprehensive utilization /
- Dangba /
- Sichuan Province
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表 1 锂辉石单矿物电子探针成分分析/%
Table 1. Monomineral chemical analysis of spodumene by EPMA
Na2O MgO K2O CaO P2O5 SiO2 Al2O3 FeO MnO Cr2O3 Li2O* 合计 0.147 0.006 0.018 0.031 0.058 65.62 27.479 0.299 0.051 0.019 8.29 102.0 0.143 0.005 0.011 0.017 0.021 65.83 27.412 0.54 0.127 0.009 8.29 102.4 0.161 0.02 0.031 0.044 0 65.73 27.73 0.298 0.09 0.027 8.25 102.4 
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表 2 锂辉石单矿物LA-ICP-MS分析/%
Table 2. Monomineral chemical analysis of spodumene by LA-ICP-MS
Na2O MgO Al2O3 SiO2 P2O5 K2O CaO TiO2 FeO MnO Li2O 合计 0.073 0.0053 27.4 64.0 0.054 — 0.029 0.0019 0.075 0.32 8.02 99.97 0.11 0.0045 27.2 64.2 0.032 0.0019 0.043 0.0027 0.083 0.33 7.95 99.96 0.12 0.0003 27.3 64.6 0.0014 0.0036 0.041 0.012 0.063 0.30 7.54 99.97
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表 3 党坝锂辉石晶胞参数与各地锂辉石晶胞参数的对比
Table 3. Lattice parameters of spodumene from the Dangba Deposit and the comparision to other spodumenes
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表 4 伟晶岩矿石多元素分析结果%
Table 4. Chemical analysis of multi-elements of pegmatite ore samples
Li2O Nb2O5 Ta2O5 SnO2 BeO Rb2O Cs2O SiO2 Al2O3 TFe MnO MgO CaO Na2O K2O P2O5 1.33 0.009 0.004 0.01 0.04 0.106 0.02 75.43 15.56 0.51 0.13 0.03 0.25 4.23 2.19 0.22
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