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摘要:
艾钛锌矿首次在澳大利亚Broken Hill市的North Mine矿床被发现，随后在世界其他矿床中也有少量发现. 然而，对于该矿物的总体报道较为稀缺，并且其化学成分、形成地质作用等方面的研究相对不足. 国内首次在湘东北连云山岩体发现艾钛锌矿，此前尚无相关报道. 经过详细的野外地质调查、岩相学观察、电子探针定量分析等一系列工作，对其化学成分和形成地质作用进行了深入研究. 艾钛锌矿赋存于连云山花岗岩体外围的伟晶岩脉中，主要化学成分为TiO2、ZnO、FeO、MnO，为含Fe、Mn、Zn的类质同象固熔体矿物. 综合地质条件分析得出，艾钛锌矿的形成与岩浆晚期的热液－伟晶作用密切相关. 艾钛锌矿的发现不仅充实了区域内的基础地质资料，而且为理解区内基础地质过程以及铌钽等稀有金属成矿机制提供了新的视角.
Abstract:Ecandrewsite was first discovered in North Mine deposit of Broken Hill, Australia, and has since been found in minor quantities in other deposits worldwide. However, comprehensive reports on this mineral remain scarce, with limited research on its chemical compositions and genetic geological process. In China, ecandrewsite was first identified in Lianyunshan pluton of northeastern Hunan Province. Through detailed field geological survey, petrographic observation, and electron probe microanalysis(EPMA), the paper studies its chemical characteristics and geological formation processes systematically. The ecandrewsite is occurred in the pegmatite dikes around the Lianyunshan granite pluton, with the primary chemical components of TiO2, ZnO, FeO, and MnO, presented as the isomorphic solid solution mineral containing Fe, Mn, and Zn. Combined with the geological conditions, it is considered that the formation of ecandrewsite is closely related with the hydrothermal-pegmatitization in the late magmatic stage. The discovery of ecandrewsite not only enriches the basic regional geological data, but also provides new insights into understanding the geological evolution and metallogenic mechanism of rare metals such as Nb and Ta in the area.
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Key words:
- ecandrewsite /
- pegmatite dike /
- solid solution /
- Lianyunshan pluton /
- Hunan Province
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表 1 艾钛锌矿电子探针分析结果
Table 1. EPMA analysis results of ecandrewsite
测点编号 CaO TiO2 MgO FeO MnO ZnO Total 1 0.040 53.137 - 5.744 9.800 29.596 98.317 2 0.046 52.516 0.006 6.146 11.431 27.551 97.696 3 0.058 52.525 0.008 6.453 13.801 25.956 98.801 4 0.070 52.476 - 7.798 17.305 19.970 97.619 5 0.054 53.764 0.004 6.467 16.571 22.334 99.194 6 0.033 53.115 0.002 5.880 14.686 25.256 98.972 7 0.059 52.048 - 6.726 12.327 26.293 97.453 8 0.037 52.421 0.095 5.915 15.609 24.817 98.894 9 0.044 52.717 0.026 4.994 13.059 27.632 98.472 含量单位：%. “-”表示低于检测限. 
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表 2 以3个氧原子为基准计算阳离子数及艾钛锌矿化学式
Table 2. Calculation of cation numbers and chemical formula of ecandrewsite based on three oxygen atoms
序号 Ti Fe Mn Zn 化学式 1 1.04 0.13 0.22 0.57 （Zn0.57Fe0.13Mn0.22）Ti1.04O3 2 1.04 0.13 0.25 0.53 （Zn0.53Fe0.13Mn0.25）Ti1.04O3 3 1.03 0.14 0.30 0.50 （Zn0.5Fe0.14Mn0.3）Ti1.03O3 4 1.03 0.17 0.38 0.38 （Zn0.38Fe0.17Mn0.38）Ti1.03O3 5 1.04 0.14 0.36 0.42 （Zn0.42Fe0.14Mn0.36）Ti1.04O3 6 1.03 0.13 0.32 0.48 （Zn0.48Fe0.13Mn0.32）Ti1.03O3 7 1.03 0.15 0.28 0.51 （Zn0.51Fe0.15Mn0.28）Ti1.03O3 8 1.02 0.13 0.34 0.48 （Zn0.48Fe0.13Mn0.34）Ti1.02O3 9 1.03 0.11 0.29 0.53 （Zn0.53Fe0.11Mn0.29）Ti1.03O3
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