Rock alteration adjacent to fractures and its effect on reducing capacity in Beishan granite

Abstract

In order to determine the rock alteration and its effect on reducing capacity in Beishan granite, mineralogy and geochemical analysis of the rock adjacent to fractures have been preliminarily performed during site characterization. The results show that the altered rock takes some specific changes in mineralogy and chemical composition compared with the unaltered rock. The variation of some elements (Na2O, CaO, Fe, etc.) content in the specific altered rock is mainly related to the changes in mineralogy. The Fe(II)/Fetotal-ratio analysis indicates that the alteration around fractures has little effect on reducing capacity of the bedrock.