摘要
长营岭钨锡矿床热液成矿-成晕作用可用包含化学动力学和流体动力学在内的综合模型进行描述,矿床和原生晕的形成是其中某种动力学因素起主导作用并与其他因素相耦合的结果。元素的扩散作用和扩散系数大小不同是形成原生晕横向分带的主要原因。原生晕轴向分带具有Sn,W,F等元素在上,亲硫元素在下的“逆向”特征,其形成主要同热液的渗滤速率及两类元素大量进入热液的时间先后有关。
The synthetic model for the ore-forming and halo-forming processes ofhydrothermal fluid of Changyingling W-Sn deposit may be described as adynamic equation involving chemical reaction and flows of advection,infiltration and diffusion. Ore deposits and primary halos were formed asa result of a leading role of one of three tems in the equation coupled withthe other two terms. The formation of the transversal zoning of primaryhalos is related mainly to diffusion and the difference of diffusion coefficientsof elements. The axial zoning of primary halos is characterized by 'reverse'zoning indicating W, Sn, F ect. are front elements of vein, whereassulphophile elements are mid-lower ones. It is related principally to theinfiltration rate of hydrothermal fluid and the time of getting into hydro-thermal fluid by elements in large quantities.
关键词
钨矿
锡矿
矿床
原生晕
动力学
tungsten deposit
tin deposit
zoning of primary halos
dynamics
diffusion
infiltration
Guangxi
Changyingling
