Dissolution of altered tuffaceous rocks under conditions relevant for CO<inf>2</inf> storage

Yutaro Takaya, Kentaro Nakamura, Yasuhiro Kato

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    We conducted CO<inf>2</inf>-water-rock interaction experiments to elucidate the dissolution characteristics and geochemical trapping potential of three different altered andesitic to rhyolitic tuffaceous rocks (Tsugawa, Ushikiri and Daijima tuffaceous rock) relative to fresh mid-ocean ridge basalt. The experiments were performed under 1MPa CO<inf>2</inf> pressure to reproduce the water-rock-CO<inf>2</inf> interactions in CO<inf>2</inf> storage situations. Basalt showed high acid neutralization potential and rapid dissolution of silicate minerals. Two of the tuffaceous rocks (Ushikiri and Daijima) showed relatively high solubility trapping potential, mainly due to the dissolution of carbonate minerals in the andesitic Ushikiri tuffaceous rock and the ion-exchange reaction with zeolite minerals in the rhyolitic Daijima tuffaceous rock. The mineral trapping potential of the Ushikiri tuffaceous rock was found to be relatively high, due to the rapid dissolution of Mg- and Ca-bearing silicate minerals. Our experimental results suggest that regions of porous and andesitic tuffaceous rock hold global promise as CO<inf>2</inf> storage sites.

    Original languageEnglish
    Pages (from-to)78-87
    Number of pages10
    JournalApplied Geochemistry
    Volume58
    DOIs
    Publication statusPublished - 2015 Jul 1

    ASJC Scopus subject areas

    • Environmental Chemistry
    • Pollution
    • Geochemistry and Petrology

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