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地质论评 2004

湘西沃溪金锑钨矿床含金石英脉的分形生长动力学

Keywords: 分形生长动力学石英脉湘西沃溪金锑钨矿床

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Abstract:

笔者等对湘西沃溪金锑钨矿床石英脉长度与厚度的分形关系及其厚度的分形分布进行了分析,探讨了石英脉分形生长的可能动力学机理。分析结果表明,石英脉长度厚度关系的分维值Dr在0.4070到1.0784之间,Dr值与相应石英脉的平均厚度呈明显正相关关系,相关系数为0.6636。石英脉厚度分布的分维值DT在0.3420到1.4661之间,与相应石英脉平均厚度呈负相关关系,相关系数为-0.5706,说明厚度分布的分维值DT越小,脉体连通性越好。研究表明,石英脉体生长早期,以横向膨胀为主,其长度厚度关系分维值Dr<1.0;脉体生长达到一定规模时,相邻脉体会通过相互连通而迅速增长,总体表现为纵向延长,从而导致Dr>1,Dr随着石英脉的连通生长而增大。模拟结果表明,具有稳定的脉体成核率α和生长速率β的脉体生长模式将导致脉体厚度的分形分布,且厚度分布的分维值DT值将随着脉体成核率α的增大而增大、随着脉体生长速率β的增大而减小。

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