2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 17 - Sep 19, 2022新潟大学 五十嵐キャンパス
2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 17 - Sep 19, 2022新潟大学 五十嵐キャンパス
[S2P-02]Alteration processes of oceanic mantle inferred from serpentinization in the Salahi mantle section, the Oman Ophiolite
Yohki Yoshiba2, *Eiichi Takazawa1,3, Main Tokinaga2(1. Niigata Univ, Sci., 2. Niigata Univ. Grad. Sch. Sci. Tech., 3. JAMSTEC)
Keywords:
serpentinization,upper mantle,peridotite,oceanic lithosphere,Oman ophiolite
This study reports serpentinization in the Salahi mantle section of the Oman Ophiolite to discuss the initial stage of water infiltration into the uppermost mantle. We found the ubiquitous occurrence of antigorite and talc in the Salahi mantle section. The presence of antigorite veins and their morphology suggest that hydrothermal fluids infiltrated along fractures. The less occurrence of antigorite and talc in the northwestern part of the Salahi mantle section may indicate that the penetration of hydrothermal fluids was somehow restricted at the center of the ridge segment.