秦岭造山带古热水场地球化学类型及流体动力学模型探讨——热水沉积成矿盆地分析与研究方法之二  

DESCUSSES ON MODEL OF FLUID DYNAMICS FOR HYDROTHERMAL WATER SYSTEM AND GEOCHEMICAL PATTERNS OF PALEO HYDROTHERMAL FLUIDS IN THE QINLING OROGEN —The analysis and approach of sedimentary basin with hydrothermal sedimentation (Part Ⅱ)

作　　者：方维萱[1] 

机构地区：[1]中国科学院地球化学研究所矿术地球化学开放研究实验室

出　　处：《西北地质科学》1999年第2期17-27,共11页Northwest Geoscience

基　　金：国家自然科学基金;中科院地化所矿床地球化学开放研究实验室资助

摘　　要：采用地质类比方法， 结合秦岭造山带热水沉积岩相研究， 提出热水沉积体系概念。通过现代陆相及海相热泉和秦岭热水沉积岩相对比， 按化学成分可将古热水场划分为强酸性硫酸盐型、弱酸强碱碳酸盐型、以ＳｉＯ２ 为酸酐型、碱性富Ｍｇ 重卤水型、热卤水型及强酸性硼硅酸盐型等６ 种类型古热水场。并对典型热水场的地球化学类型特征及成岩成矿作用进行了讨论。在前人研究的基础上， 探讨了热水系统的流体地球化学动力学。提出了热水沉积成矿盆地中热水系统的两类地球化学流体动力学模型， 热水层流体系模型和不同成分、性状的热水混合体系模型。从热水系统的边界协同学约束条件、空间拓朴结构、流体通量动量方程及矿质大规模沉淀的地球化学动力学等方面对这两类流体动力学模型进行了讨论。Based on the principle of geological similarity, teogether with research on hydrothermal sedimentary facies in the Qinling orogen, the concept of the hydrothermal sedimentary system has been discussed in the paper In terms of chemical components of hot brine or springs on inland and on the sea floors and petrochemistry of hydrothermal sedimentary rock facies in the Qinling orogen, the geochemical patterns of the paleo hydrothermal fields in the study area can be recognized six different kinds of paleo hydrothermal water, i e acidic the hydrothermal water field of sulfate of carbonate type, the acidic and hard alkaline hydrothermal water field of carbonate type, the hydrothermal water field of silicate type,the alkaline brine field with Mg enriching, the hot brine field, and acidic hydrothermal water field of borosilicate type Characteristics of typical geochemical patterns of hydrothermal fields and ore rock formation of paleo hydrothermal water have been discussed in the paper In the basis of the known achievement in hydrothermal solutions, dynamic models of fluid dynmics of geochemistry have been initated Layer flow model of hydrothermal water with monocomponent of chemistry can be applied to understand ore rock formation of the hydrothermal dynamics, such as Ba ore layer and Fe ore layer. The mixing flow model of the hydrothermal system with different chemical components and different states can be applies to understand ore rock formation of the hydrothermal geochemical dynamic, such as sulfide barite siderite albite chert layer (Ag polymetallic ore laryers)

关 键 词：造山带 古热水场 地球化学 热水成矿 流体动力学 

分 类 号：P314.2[天文地球—固体地球物理学] P611.1[天文地球—地球物理学]