S2: Water Rock Interaction (Special Session)

[S2-06] Alteration processes associated with selective leaching of elements in basalt-seawater system revealed by supercritical hydrothermal flow through experiment

「発表賞エントリー」

*Yusuke Netsu¹, Atsushi Okamoto¹, Nobuo Hirano¹, Masaoki Uno¹, Noriyoshi Tsuchiya¹ (1. Tohoku Uni., Env.)

Keywords:Basalt-Seawater interaction, Supercritical fluid, Flow-through experiments

We conducted the hydrothermal flow-through experiments on basalt-fluid interaction under supercritical conditions to understand the relationship between mass transfer and metamorphism within hydrothermal systems of oceanic crusts. We revealed that the reaching of albite component dominantly occurs in distilled water, whereas in seawater, chlorite was formed throughout reaction vessel by reactions of clinopyroxene and plagioclase in matrix with Mg ion in seawater. Our result suggests that initial solution chemistry provides significant controls on the reaction pathways.