Bender, Michael L. (1983): Pore water chemistry of the Mounds Hydrothermal Field, Galapagos spreading center; results from Glomar Challenger piston coring. American Geophysical Union, Washington, DC, United States, Journal of Geophysical Research, 88 (B2), 1049-1056, georefid:1983-024678

Abstract:
MnO (sub 2) -encrusted nontronite mounds. Analyses are presented for Ca, Mg, Si, NH (sub 3) , Mn, and Fe. Results confirm conclusions that hydrothermal solutions enriched in Ca by 1-2 mM and depleted in Mg by approximately 2 mM are upwelling through the mounds and the surrounding pelagic sediments. Si, NH (sub 3) , and Mn (super 2+) concentrations generally increase upcore. The formation of nontronite (Fe(III) (sub 4) Si (sub 8) O (sub 20) (OH) (sub 4) ) involves oxidation of dissolved Fe (super 2+) . Fe (super 2+) oxidation by MnO (sub 2) and replacement of MnO (sub 2) by nontronite at the base of the MnO (sub 2) crust, followed by upward migration of Mn (super 2+) and precipitation of MnO (sub 2) at the sediment water surface.--Modified journal abstract.
Coverage:
West: -86.1000 East: -86.0500 North: .3700 South: .3200
Relations:
Expedition: 70
Site: 70-506
Site: 70-507
Site: 70-508
Site: 70-509
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Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/JB088iB02p01049 (c.f. for more detailed metadata)
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