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本文对荷花坪锡多金属矿,锡田锡钨多金属矿以及新田岭钨矿矽卡岩中的石榴子石样品分别进行了主量元素、微量元素及红外光谱测定。结果表明,3种矽卡岩中的石榴子石多数属于(铁铝榴石+镁铝榴石+锰铝榴石)<15%的钙铁-钙铝榴石系列。新田岭钨矿的石榴子石中钙铁榴石端员含量明显高于其他两个锡矿。此外,在荷花坪、新田岭矿区发现了与后期铅锌矿化有关的锰质石榴子石。在单矿物尺度上,荷花坪矿区石榴子石核部富集钙铝榴石,边部富集钙铁榴石,而锡田矿区石榴子石与之相反;新田岭矿区石榴子石具有相对均匀的核部而边部发育细密的振荡环带。在稀土配分模式上,荷花坪矿区石榴子石重稀土富集,轻稀土亏损,δEu负异常较弱;锡田矿区石榴子石稀土总量最高,轻重稀土无明显分异,δEu负异常较弱;新田岭矿区石榴子石轻重稀土分异极强,重稀土富集,轻稀土严重亏损,δEu具显著的正异常。3种石榴子石的红外漫反射光谱均显示有10种吸收峰,其中低频区的5种与石榴子石成分中的钙铁榴石含量直接相关,因而造成新田岭矿区石榴子石的吸收峰与另两矿区石榴子石相比显著向低频波段移动。通过对华南3类含钨锡矽卡岩中的石榴子石的研究,确认了石榴子石的形成与矽卡岩形成中热液体系的环境变化密切相关。微量元素分析与红外光谱技术作为近年来矽卡岩型石榴子石研究的热点,能够提供传统研究中所不能涉及的微观信息。
In this paper, main elements, trace elements and infrared spectra of garnet samples in Hehuaping tin polymetallic ore, tin tin-tungsten polymetallic ore and Xintianling tungsten skarn are respectively measured. The results show that most of the three types of skarn in the skarn belong to the series of calcium-iron-garnet with <15% of (Almandine + Al-Mg-Al-garnet). The content of calcium and iron garnet in garnet from Xintianling tungsten mine is obviously higher than that of the other two tin mines. In addition, manganese-based garnet associated with the later lead-zinc mineralization was discovered in the Hohhot and Xintianling mines. On the single mineral scale, the garnet in the Hoaping area is enriched with garnet in the core of the garnet, while the edges are enriched with garnet, while the garnet in the tin field is the opposite. The garnet in the Xintianling mining area has a relative Uniform nuclei and the development of the fine side of the oscillation ring zone. In the REE pattern, the heavy rare earths are accumulated in the Hepaping mining area, and the depletion of light rare earths and the negative δEu anomaly are weak. The total rare earths content of garnet in the tin mining area is the highest, while there is no obvious difference between the light and heavy rare earths and the negative δEu anomaly The light and heavy rare earths of garnet in Xintianling mining area are highly differentiated, enriched in heavy rare earths, and heavily depleted in light rare earths, indicating a significant positive anomaly of δEu. The infrared diffuse reflectance spectra of three kinds of garnet showed 10 kinds of absorption peaks. Among them, 5 kinds of low frequency regions were directly related to the content of garnet in garnet, which caused the absorption of garnet in Xintianling mining area Peak and the other two mining area garnet significantly compared to the low frequency band. Through the study of garnet in three types of tungsten-bearing tin skarn in South China, it was confirmed that the formation of garnet is closely related to the environmental change of hydrothermal system during skarn formation. As a hotspot in the research of skarn-type garnet in recent years, trace element analysis and infrared spectroscopy can provide the microscopic information that can not be involved in the traditional research.