FRACTION-DIMENSIONAL TIME-SPATIAL STRUCTURE OF MULTI-METALLIC DEPOSIT IN SHIZHUYUAN: MINERALIZED Sn AND OTHER ELEMENTS IN GARNET AS AN EXAMPLE
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摘要: 湖南柿竹园W, Sn, Mo, Bi多金属矿床是一个特大型矿床, 其成矿系统极其复杂, 表现为多层次、多子系统.通过微区成分分析等手段, 详细地研究了该矿床块状矽卡岩石榴子石等矿物中Sn, W, Bi等元素的分布, 证实了Sn等元素的质量分数在矿床宏观分布上和矿物内部微观分布上, 均具幂律分布规律, 即具分形时-空结构.Sn元素在石榴子石中分布的分形维为1.7;在符山石中的分形维为1.8;在后期绿帘石中的分形维为1.9.从矿物晶体微观成矿元素的分布特征来看, 成矿巨系统常处于临界状态, 当其受到扰动, 就产生响应, 通过间断性阵发-平衡(相对静止) 的往复而复归临界状态, 这种自组织的临界状态是该矿床动力学的最基本特点.Abstract: The W, Sn, Mo, Bi multi-metallic deposit in Shizhuyuan, Hunan is a very large deposit. Its mineralized system is very complex, containing multilayers and many subsystems. By micro-area chemical analysis, the distribution of Sn, W, Bi in the garnet of massive skarn is studied. It is confirmed that the contents of Sn and other elements possess the characteristics of power-rate in macro-scale and micro-scale, i.e. fraction-dimensional time-spatial structure. The fraction-dimension of Sn is 1.7 in garnet, 1.8 in vesuvianite, and 1.9 in anaphase epidote. From the micro-distribution characteristics of mineralized elements in mineral crystals, mineralized large-system was always critical, when it was disturbed, it would return to critical state by discontinuously reacting-equilibrating, this type of self building-up critical state is the fundamental dynamic characteristics of the deposit.
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图 1 A7石榴子石电子探针分析位置
右半部行距20 μm, 点距10 μm, 局部由于有裂隙未分析
Fig. 1. Location of electron microprobe analysis at garnet A7
图 4 样品B1的显微镜照片(a) 和电子显微镜背散成分像(b)
a.放大倍数275×, 单偏光, 中黑线示分析点位置; b.成分环带十分清楚, 照片中标明了分析点的位置, 分析长度160 μm
Fig. 4. Micrograph (a) and electron-micrograph (b) of garnet B1
图 5 块状矽卡岩钙质石榴子石中SnO2质量分数与距岩体距离关系
Fig. 5. Relation between mass fraction of SnO2 in garnet and distance from granite body
图 6 ln (s/m)-ln [w (SnO2) /%]关系
Fig. 6. Relation between ln (s/m) and ln [w (SnO2) /%]
表 1 A7石榴子石的分数维参数
Table 1. Parameters of fraction-dimension at garnet A7
表 2 5件样品分析结果
Table 2. Analyzed results of 5 samples
表 3 5件石榴子石主要端元组分质量分数
Table 3. End-member mass fractions of 5 garnets
% 
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