| 广西水晶矿床分布规律及其矿床成因的研究 |
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| 引用本文：.1983.Distribution regularity and ore genesis of rock crystal deposits in Guangxi[J].Mineral Deposits,2(1):66~75 |
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| Distribution regularity and ore genesis of rock crystal deposits in Guangxi |
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| Abstract:Apart from a few ores in the pegmatites within granites and in the contact zones of sharns, a substantial number of rock crystal deposits in Guangxi occur in various sedimentary rocks, especially in quartz veins and calcite veins inside Upper Carboniferous carbonate rocks. The deposits are controlled combinedly by the latitudinal tectonic system, neocathaysian tectonic system and a NW trending structuraj zone, showing a distribution characterized by orientation, symmetry, equidistance and mosaic pattern. Of all inclusions, liquid inclusions are best developed, and a certain number of gaseous inclusions have also been recognized in some deposits. This implies that ores were formed mostly in an environment dominated by hydrothermal solutions and partly in the boiling state. Some inclusions contain a substantial amount of liquid carbonic acid, reaching as much as 30% somewhere, some have in them a lot of organisms of gas or liquid phase. The homogeneous temperatures are determined to be in the range of 107～420℃, salinities (NaCl wt%) 2.65~10.9, pressures 200~600 bar, and pH 7.04~7.16. Lead isotopes of certain deposits fall into anomalous limits, while δS34, δO18 and δO18H2O have the values of +18.18~ -10.37‰, 6.00~24.02‰ and l.9~2.4‰ respectively. The above characteristics and data vary with regularity in keeping with different geological setting of the deposits. The rock crystal deposits in Guangxi are thus divided genetically into three types: postmagmatic pneumato-hydrothermal deposits, deposits from underground hot waters, and transitional deposits formed by above two solutions mixed at various ratios. |
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