关于岩石风化过程中化学组分迁移的定量研究方法

岩石化学分析结果的定和效应给定量研究风化体系中化学组分的迁移规律带来困难。一般岩石风化体系可以有母岩-滤液和母岩-风化产物两个子体系。本文即探讨该二子体系中化学组分迁移的定量计算问题。对比分析表明,母岩-滤液子体系方法较适用于风化程度高的体系,而母岩-风化产物子体系方法较适用于风化程度低的体系。对于风化程度中等的体系,宜采用两种子体系方法所得结果的加权平均,其中权重按风化程度取值。

A DISCUSSION ON QUANTITATIVELY DETERMINING CHEMICAL ELEMENT MOBILITY OF ROCK-WEATHERING PROCESS

The constant-sum effect from petroc hemical analyzing results makes it v ery difficult to quantitatively determine element mobility in rock-weathering process.In this paper,w e deal with the element-mobility calculating methods from two aspects:the rock-solution approach and th e rock-residue one,and then we discuss and deduce the methods of quantitatively determining element mo bility of rock-weathering process according to the mass-balance constraints.It is found that the method developed from the rock-solution ap-proach is more applicable to the cour se where rocks were intensively weathered,while the method established by the rock-residue approach is more suitable to the course where rocks we re more lightly weathered.For the course where rocks underwent middle-grade weathering,the averaging-w eight method and rock-weathered de-gree should be taken into consideration when the mobility of chemical ele ments in this weathering system needs to be quantitatively determin ed.