georefid:1983-024678SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/JB088iB02p01049<gco:CharacterString>Pore water chemistry of the Mounds Hydrothermal Field, Galapagos spreading center; results from Glomar Challenger piston coring</gco:CharacterString>1983-01-01publicationgeorefid:1983-024678doi:10.1029/JB088iB02p01049Bender, Michael L.Univ. R.I., Grad. Sch. Oceanogr., Kingston, RI, United StatesauthorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentDigitalJournal of Geophysical Research88 (B2)1049-1056MnO (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.completedGeochemistry of rocks, soils, and sedimentsareal studiesclay mineralogyclay mineralscoresDeep Sea Drilling ProjectDSDP Site 506DSDP Site 507DSDP Site 508DSDP Site 509East PacificGalapagos Riftgeochemistryhydrothermal conditionsIPODLeg 70marine sedimentsmineralsmoundsMounds Hydrothermal FieldnontroniteoxidationPacific Oceanpore watersedimentssheet silicatessilicatesSouth American PacificSouth PacificSoutheast Pacificurn:org.iodp:exp:70urnlargerWorkCitationcampaignurn:org.iodp:exp:70:site:506urnlargerWorkCitationstudyurn:org.iodp:exp:70urnlargerWorkCitationcampaignurn:org.iodp:exp:70:site:507urnlargerWorkCitationstudyurn:org.iodp:exp:70urnlargerWorkCitationcampaignurn:org.iodp:exp:70:site:508urnlargerWorkCitationstudyurn:org.iodp:exp:70urnlargerWorkCitationcampaignurn:org.iodp:exp:70:site:509urnlargerWorkCitationstudyurn:org.iodp:exp:70urnlargerWorkCitationcampaignEnglishgeoscientificInformation-86.1000-86.05000.32000.3700application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.agu.org/journals/jb/v088/iB02/JB088iB02p01049/JB088iB02p01049.pdfdownload