Fractal and Chaotic Dynamics Mechanism for Tectonic-Fluid-Mineralizationoft-com:office:office" />
详细信息
- 责任者：Xie Yanshi (School of Nuclear Resource and Nuclear Fuel Engineering ; University of South China ; Hengyang 421001 ; China) ; Tan Kaixuan
- 刊名：Geotectonica et Metallogenia
- 出版年：2010
- 卷期：34(3)
- 关键词：分形分析 ; fractal analysis ; 混沌分析 ; chaos analysis ; 动力学 ; dynamics ; 金属矿 ; metal ores
- 页码：p.378-385
- 图表：8 illus., 41 refs.
- 分类号：1001
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
In this paper,the fractal growth of fracture-vein system,the nonlinear feedback of tectonic-fluid-mineralization system and the deposition and mineralization with fractal structure and chaos characteristics are summarized.To investigate the fractal structure of tectonic-fluid-mineralization system,two typical deposits are studied.Fractal analyses of element contents of fracture zone and strata in Shuikoushan Pb-Zn-Au polymetallic ore field in Hunan Province,China,indicate that strata and granites show single fractal relationship on the original element distribution but the fracture zones show bifractal relationship with some more active elements such as Cu,Pb and Zn.The bifractal relationship indicates that at least two geological processes control the element distribution and the tectonic processes enhance the enrichment of ore-forming elements.The fractal relationships of thickness vs.length of veins in the Xiangxi Au deposit,western Hunan Province,China,demonstrate that vein grew mainly in lateral expansion and the fractal dimension a<1 during the early stage and it extended rapidly via vein linkings and resulted in the dimension a>1 when vein reached certain size.And what’s more,the spatial variation of Au grade in the Xiangxi Au deposit shows a chaotic series and suggests the evolution of ore-forming fluid and the enrichment and deposition of Au are chaotic dynamic processes.In generally,tectonic-fluid-mineralization systems show a fractal structure characteristic. The mineral deposition is a complex nonlinear dynamic process with the activation,migration and sedimentation of ore-forming elements.The tectonic activity controlled the fractal growth of fissure-vein system and the location of ore deposition.Ore-forming metal elements in hydrothermal system will deposit at appropriate places through a complex nonlinear feedback effect among structural stress,fluid flow and fluid-rock reaction and result in the fractal and chaotic characteristics of the deposits and grade distribution.