Genesis and development processes of fractures in granite: Petrographic indicators of hydrothermal alteration.

ABSTRACT: Biotites occur with varying degrees of alteration within a granite. This study analyzes the relationships among alteration indicators, areal microvoid fractions in chloritized biotite, and macroscopic fracture frequencies in the Toki granite, central Japan, to establish the genesis and development processes of fractures in granite. Appropriate characterizations for the frequency distribution of macroscopic fractures in granite can assist in understanding potential hydrogeological applications, which contributes to safety evaluations for geological disposal and storage. Borehole 06MI03, drilled to a depth of 191 m, was used to obtain samples for the analysis. In total, 24 samples that depicted variations in the macroscopic fracture frequency were selected. Petrographic alteration indicators

SUBMITTER: Yuguchi T 

PROVIDER: S-EPMC8096112 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature