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Formation of chemical gardens on granitic rock; a new type of alteration for alkaline systems

Hisao Satoh, Katsuo Tsukamoto and Juan Manuel Garcia-Ruiz
Formation of chemical gardens on granitic rock; a new type of alteration for alkaline systems
European Journal of Mineralogy (June 2014) 26 (3): 415-426

Abstract

In order to understand the groundwater flow at near-underground facilities such as waste repositories, we have studied the effects of flowing an alkaline solution leached from cementitious building materials through the fractures of low-porosity granitic rocks under laboratory conditions. The results show that silica released from the dissolution of sodium-rich plagioclase and quartz reacts with the calcium leached from cementitious buildings to form calcium silicate hydrates (C-S-H) phases in the form of hollow tubular structures. These tubular structures form selectively on the surface of plagioclase in a similar way to reverse silica gardens structures. It was found that the rate of precipitation of C-S-H phases is faster than the rate of dissolution of plagioclase. This self-triggered dissolution/precipitation phenomenon may be an important factor controlling groundwater permeation in natural alkaline underground systems.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 26
Serial Issue: 3
Title: Formation of chemical gardens on granitic rock; a new type of alteration for alkaline systems
Affiliation: Mitsubishi Materials Corporation, Naka Energy Research Laboratory, Naka, Japan
Pages: 415-426
Published: 201406
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 23
Accession Number: 2014-055665
Categories: General mineralogyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N46°32'60" - N46°32'60", E08°19'60" - E08°19'60"
Secondary Affiliation: Tohoku University Aramaki, JPN, JapanUniversity of Granada, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201430
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