Connotea
CiteULike
del.ico.us
BibSonomyAbstract
Deep-slab fluids fuel extremophilic Archaea on a Mariana forearc serpentinite mud volcano: Ocean Drilling Program Leg 195
Department of Oceanography, University of Hawaii, Honolulu, Hawaii 96822, USA
104 Berkshire Road, Ithaca, New York 14850, USA
Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, Hawaii 96822, USA
Biology Department, Western Washington University, Bellingham, Washington 98225, USA
As the Pacific plate subducts beneath the Mariana forearc it releases water that hydrates the overlying mantle wedge, converting it to serpentinite that protrudes to form mud volcanoes at the seafloor. Excess H2O ascends through these mud volcanoes and exits as cold springs at their summits. The composition of this deep-slab derived water has been determined by drilling on two of these seamounts. It has a pH of 12.5 and, relative to seawater, is enriched in sulfate, alkalinity, Na/Cl, K, Rb, B, light hydrocarbons, ammonia, 18O, and deuterium, and depleted in chloride, Mg, Ca, Sr, Li, Si, phosphate, and 87Sr. Within the upper 20 m below seafloor at South Chamorro Seamount a microbial community operating at pH 12.5, made up overwhelmingly of Archaea, is oxidizing methane from the ascending fluid to carbonate ion and organic carbon, while reducing sulfate to bisulfide and probably dissolved nitrogen to ammonia.
Received 10 June 2003; accepted 15 September 2003; published 14 November 2003.
Citation: (2003), Deep-slab fluids fuel extremophilic Archaea on a Mariana forearc serpentinite mud volcano: Ocean Drilling Program Leg 195, Geochem. Geophys. Geosyst., 4(11), 9009, doi:10.1029/2003GC000588.
Cited By
Bach, Wolfgang, Holger Paulick, Carlos J. Garrido, Benoit Ildefonse, William P. Meurer, and Susan E. Humphris (2006), Unraveling the sequence of serpentinization reactions: petrography, mineral chemistry, and petrophysics of serpentinites from MAR 15°N (ODP Leg 209, Site 1274), Geophys Res Lett, 33, L13306, doi:10.1029/2006GL025681.
Benton, Laurie D. (2004), Lithium abundance and isotope systematics of forearc serpentinites, Conical Seamount, Mariana forearc: Insights into the mechanics of slab-mantle exchange during subduction, Geochem Geophys Geosyst, 5, Q08J12, doi:10.1029/2004GC000708.
Fryer, P., J. Gharib, K. Ross, I. Savov, and M. J. Mottl (2006), Variability in serpentinite mudflow mechanisms and sources: ODP drilling results on Mariana forearc seamounts, Geochem Geophys Geosyst, 7, Q08014, doi:10.1029/2005GC001201.
Oakley, A. J., B. Taylor, P. Fryer, G. F. Moore, A. M. Goodliffe, and J. K. Morgan (2007), Emplacement, growth, and gravitational deformation of serpentinite seamounts on the Mariana forearc, Geophys J Int, 170(2), 615, doi:10.1111/j.1365-246X.2007.03451.x.
Oakley, A. J., B. Taylor, and G. F. Moore (2008), Pacific Plate subduction beneath the central Mariana and Izu-Bonin fore arcs: New insights from an old margin, Geochem Geophys Geosyst, 9, Q06003, doi:10.1029/2007GC001820.
Savov, Ivan P., Jeffrey G. Ryan, Massimo D'Antonio, and Patricia Fryer (2007), Shallow slab fluid release across and along the Mariana arc-basin system: Insights from geochemistry of serpentinized peridotites from the Mariana fore arc, J Geophys Res, 112, B09205, doi:10.1029/2006JB004749.
Schulte, Mitch, David Blake, Tori Hoehler, and Thomas McCollom (2006), Serpentinization and Its Implications for Life on the Early Earth and Mars, Astrobiology, 6(2), 364, doi:10.1089/ast.2006.6.364.
TAKAI, KEN, KENTARO NAKAMURA, KATSUHIKO SUZUKI, FUMIO INAGAKI, KENNETH H. NEALSON, and HIDENORI KUMAGAI (2006), Ultramafics-Hydrothermalism-Hydrogenesis-HyperSLiME (UltraH3) linkage: a key insight into early microbial ecosystem in the Archean deep-sea hydrothermal systems, Paleontol Res, 10(4), 269, doi:10.2517/prpsj.10.269.