Experimental reconstruction of Archean alkaline hydrothermal fluid

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High-temperature and-pressure experiments simulating reactions between basalt and seawater under CO2-rich conditions were conducted to reconstruct compositions of high-temperature fluids in the Archean subseafloor hydrothermal system. As a result, it was revealed that the high-temperature reactions between basalt and CO2-rich seawater generate silica-rich and metal-poor hydrothermal fluids with elevated pHin-situ(> 7). This suggests that Archean deep-sea high-temperature hydrothermal vent was not modern-type acidic black smoker but silica-dominant clear smoker.