浙江中生代浅成热液金银成矿作用的耗散结构模型

Dissipative structural model of MesozoicEpithermal Au-Ag Mineralization in Zhejiang

浙江中生代主要浅成热液金银矿床在蚀变 -矿化过程中的一些物理化学特征参数 (如 :T、P、St和ρ等 )呈非线性的变化关系 ,其控制变量是P、T和PH值。推断条带 (或环带 )状构造的矿脉(石 )是由减压沸腾作用造成的。据Drummond等 (1985)沸腾的模拟计算和研究表明 ,[H+]浓度是决定沸腾热液中的Au、Ag等成矿元素命运的主要因素。因此 ,可以[H+]浓度 (状态变量 )作为序参量来反映成矿溶液中Au、Ag浓度的变化趋势 ;并建立其自组织过程的动力学方程与开放沸腾热液系统Au、Ag沉淀的耗散结构模型。

The physical and chemical characteristic parameters(for instance: T,P, salinity and density etc.) in the alteration-mineralization process of major Mesozoic epithermal Au-Ag deposits occurring in Zhejiang exhibit nonlinear variational correlation. The controlled variables are P,T and PH values etc. in these charateristic parameters. The veins(ore) of banded (zonal) structure to infer ware formed by boiling under lower pressure. According to the simulating calcalation and study of Drummond et al.(1985),the ore-forming elements as Au and Ag etc.in boiling thermal solution were mainly decided by theconcentration.Therefore,theconcentration (Variable of state)can be taken as the ordinal parameter to reflect the trend of Au and Ag concentration Change in ore-forming solution,and build up the dynannic equation of self-organized process and the dissipative structural model of Au-Ag precipitation in system of open building thermal solution.