[1] MIT, Cambridge, MA 02139 USA
[2] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
[3] Univ S Carolina, Dept Earth & Ocean Sci, Columbia, SC 29208 USA
[4] Max Planck Inst Chem, D-55020 Mainz, Germany
[5] Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA
[6] Univ Otago, Dept Chem, Dunedin 9054, New Zealand
[7] Univ Toulouse, CNES, CNRS, Lab Etud Geophys & Oceanog Spatiales,IRD, F-31400 Toulouse, France
[8] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2AZ, England
[9] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA
[10] IFREMER, Ctr Brest, F-29280 Plouzane, France
[11] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan
[12] Univ Bristol, Sch Earth Sci, Bristol BS8 1RJ, Avon, England
[13] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia