湘西金矿含矿石英脉厚度变化的分形和混沌分析  

ANALYSIS OF FRACTAL AND CHAOTIC CHAR ACTERISTICS FOR THE THICKNESS-DISTRIBUTIONS OF AUR IFEROUS QUARTZ VEINS IN THE XIANGXI Au DEPOSIT,HUNA N,CHINA

作　　者：谢焱石[1] 谭凯旋[1] 赵志忠[1] 

机构地区：[1]中国科学院长沙大地构造研究所,湖南长沙410013

出　　处：《大地构造与成矿学》2002年第1期62-68,共7页Geotectonica et Metallogenia

基　　金：中国科学院九五重点项目(编号:KZ952-s1-402);中国科学院知识创新工程重要方向项目(编号:KZCX2-101)资助.

摘　　要：本文对湘西金矿主要矿脉的厚度变化进行了分形分析。各矿脉的厚度变化均具有分形结构特征,其中V1脉的分维值最小,V4脉的分维值最大;并且同一条矿脉在不同中段的分维值也有较大变化。通过对矿脉厚度变化的相空间重构,表明各矿脉厚度空间变化序列均为混沌演化序列,在相空间维数达到6～7时出现混沌吸引子,混沌吸引子的分维值为1.2～6.0。矿脉厚度变化的分维值越小,矿脉的平均厚度越大,其构造和流体活动也越强烈。构造变形、流体活动、矿物沉淀与岩石渗透率之间的非线性耦合作用以及矿脉通过连通而生长是导致矿脉厚度分形分布与混沌演化的主要动力学机理。Fractal analysis of thickness of primary auriferous quartz veins in Xian gxi Au deposit in this paper shows that the thickness variations of main auriferous quartz veins behave a fractal texture which the fracta l dimension of V1is the smallest and V 4 is the biggest.Big changes are found with the fractal dimension of different altitude segment in the sa me vein.Phase space restructuring i ndicates that the spatial variation of the veins'thickness is of chaotic evolution se quences.When the dimension of phase space is 6～7there appears chaotic attractors which fr actal dimension vary from 1.2to 6.0.The fractal analysis indicates that a bigger average thickness and a stron ger tectonics and fluid process foll ow a bigger fractal dimension.The nonlinear coupling of tectonics deformation,fluid flow,mineral precipitation and rock's permeability and veins'growth through small veins'linkage causes the fractal distribu tion and the chaotic evolution of the thickness of auriferous quartz vein s.

关 键 词：含矿石英脉 厚度分布 分形结构 混沌吸引子 金矿床 湖南 

分 类 号：P618.51[天文地球—矿床学]