Bender, Michael L. (1983): Pore water chemistry of the Mounds Hydrothermal Field, Galapagos spreading center; results from Glomar Challenger piston coring
Leg/Site/Hole:
Related Expeditions:
DSDP 70
Identifier:
ID:
1983-024678
Type:
georefid
ID:
10.1029/JB088iB02p01049
Type:
doi
Creator:
Name:
Bender, Michael L.
Affiliation:
Univ. R.I., Grad. Sch. Oceanogr., Kingston, RI, United States
Role:
author
Identification:
Title:
Pore water chemistry of the Mounds Hydrothermal Field, Galapagos spreading center; results from Glomar Challenger piston coring
Year:
1983
Source:
Journal of Geophysical Research
Publisher:
American Geophysical Union, Washington, DC, United States
Volume:
88
Issue:
B2
Pages:
1049-1056
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.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:0.3700 West:-86.1000 East:
-86.0500 South:0.3200
Keywords: Geochemistry of rocks, soils, and sediments; areal studies; clay mineralogy; clay minerals; cores; Deep Sea Drilling Project; DSDP Site 506; DSDP Site 507; DSDP Site 508; DSDP Site 509; East Pacific; Galapagos Rift; geochemistry; hydrothermal conditions; IPOD; Leg 70; marine sediments; minerals; mounds; Mounds Hydrothermal Field; nontronite; oxidation; Pacific Ocean; pore water; sediments; sheet silicates; silicates; South American Pacific; South Pacific; Southeast Pacific;
.