Quantitative Analysis of Morphological Zonations of Quartz Veins in Weilasituo Sn-polymetallic Deposit, Inner Mongolia
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摘要: 为探讨维拉斯托锡多金属矿床含锡石英脉形态分带的成矿动力学机制，通过利用分形和混合分布工具对断层脉带和上、下节理脉带进行定量分析。上、下节理脉带在脉厚、钨锡品位分形维数和混合筛分分布方面均具有相似性，暗示了两者可能具有相似的成矿机制。与上、下节理脉带相比，断层脉带的脉厚和钨锡品位分形维数均较小，断层脉带内的聚焦化流动、较低的脉体成核率、脉体叠加生长和矿化叠加富集可能是导致断层脉带的厚脉和富矿比例均高于上、下节理脉带的重要原因。Abstract: In order to discuss the dynamic mineralization mechanism of Sn-bearing quartz vein morphology zoning in the Weilasituo Sn-polymetallic deposit, three zonations including the upper joint vein zonation, the fault vein zonation and the lower joint vein zonation are analyzed quantitatively by means of vein thickness fractal, tin grades fractal, tungsten grades fractal and mixed distributions. It is found that the similarities of the thickness, Sn-W fractal dimensions and the mixed distributions of ore grades components in the upper and lower joint-vein zonations indicate that the two may have similar metallogenic mechanism. Compared with the upper and lower joint vein zonations, the thickness and the Sn and W grades of fractal dimensions in the fault vein are both small. The focused flow, lower nucleation rate, superimposed growth of veins and the superposition of mineralization may be the reasons for the higher proportions of thick vein and high-grade ores in the fault vein than that in the two joint vein zonations.
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