地球化学岩相学类型及其在沉积盆地分析中应用

Types of Geochemical Lithofacies and Their Applications in Basin

按照流体地球化学动力学-岩石组合系列,地球化学岩相学相系统类型分为氧化-还原相(ORF)、酸碱相(Eh-pH F)、盐度相(SF)、温度相(TF)、压力相(PF)、化学位相(CF)、不等化学位相和不等时不等化学位地球化学岩相等8种。在沉积盆地分析中,地球化学岩相学主要用于沉积盆地物质组成及演化历史研究,恢复重建沉积盆地中流体场类型和成分特征、流体场分布范围及运移规律、流体场大规模运移机制及动力学、盆地改造过程中流体叠加关系等,进行深部找矿预测。

Types of geochemical lithofacies may be classified into oxidizing-reducing lithofacies,acidity-alkalini-ty lithofacies,salinity lithofacies,temperature lithofacies,pressure lithofacies,chemical potential lithofacies,heterochemical potential lithofacies,and heterochronous heterochemical potential lithofacies,based on geochemi-cal dynamics of fluids and series of rock associations.In the basin analysis,geochemical lithofacies may be applied to study on rock compositions in the sedimentary basin and evolution history of basin.It can help us to restore and rebuild types and compositions of fluid field,distribution areas and migration rules of fluid field,mechanism and dynamics of fluid migrations at the large-scale,and relationships of hydrothermal fluid superimposing during the deformation of basin in order to predication for mineral resource at the depth.