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• W2009703485 abstract "On DSDP Leg 70, Glomar Challenger piston cored hydrothermal MnO2-encrusted nontronite mounds and adjacent pelagic sediments through to basement. Pore waters were collected by centrifuging, squeezing, and in situ sampling; analyses are presented here for Ca, Mg, Si, NH3, Mn, and Fe. Our results confirm Maris and Bender's (1982) conclusions that hydrothermal solutions enriched in Ca by 1–2 mM and depleted in Mg by ∼2 mM are upwelling through the mounds and the surrounding pelagic sediments. Si, NH3, and Mn2+ concentrations generally increase upcore, reflecting addition of products of metabolic reactions to upwelling hydrothermal solutions. Pore water iron concentrations decrease upcore, probably as a result of oxidation and precipitation of upwelling hydrothermal iron. The formation of nontronite (Fe(III)4Si8O20(OH)4) involves oxidation of dissolved Fe2+. Several models, constrained by the electron balance, are proposed to explain the process of nontronite formation. The stratigraphy of the mounds (thick nontronite covered by a thin MnO2 crust) may be explained by postulating Fe2+ oxidation by MnO2 and replacement of MnO2 by nontronite at the base of the MnO2 crust, followed by upward migration of Mn2+ and precipitation of MnO2 at the sediment water interface." @default.
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• W2009703485 date "1983-01-01" @default.
• W2009703485 modified "2023-10-18" @default.
• W2009703485 title "Pore water chemistry of the Mounds Hydrothermal Field, Galapagos Spreading Center: Results fromGlomar ChallengerPiston Coring" @default.
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• W2009703485 doi "https://doi.org/10.1029/jb088ib02p01049" @default.
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