Abstract
Three push cores obtained near a hydrothermal vent in the Escanaba Trough, Gorda Ridge, have been analyzed for interstitial water chemistry, inorganic solids geochemistry, and organic geochemistry. The inorganic analyses indicate the study area has no present hydrothermal fluid flow but the presence of a high temperature mineral phase (calcite precipitate representing a temperature range of 168°–199°C) indicates past hydrothermal activity. The presence of weathered sulfides and an extensively weathered and oxidized hydrothemal petroleum is evidence for a retrograde oxidative weathering process occurring in the sediments.
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