title: Enhanced East Pacific Rise hydrothermal activity during the last two glacial terminations.
abstract: Mid-ocean ridge magmatism is driven by seafloor spreading and decompression melting of the upper mantle. Melt production is apparently modulated by glacial-interglacial changes in sea level, raising the possibility that magmatic flux acts as a negative feedback on ice-sheet size. The timing of melt variability is poorly constrained, however, precluding a clear link between ridge magmatism and Pleistocene climate transitions. Here we present well-dated sedimentary records from the East Pacific Rise that show evidence of enhanced hydrothermal activity during the last two glacial terminations. We suggest that glacial maxima and lowering of sea level caused anomalous melting in the upper mantle and that the subsequent magmatic anomalies promoted deglaciation through the release of mantle heat and carbon at mid-ocean ridges.
authors.affiliation: Deptartment of Marine Sciences, University of Connecticut, Groton, CT 06340, USA.
authors.forename: D C
authors.initials: DC
authors.lastname: Lund
authors.affiliation: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: P D
authors.initials: PD
authors.lastname: Asimow
authors.affiliation: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Farley
authors.affiliation: Department of Geological Sciences, Michigan State University, East Lansing, MI 48824, USA.
authors.forename: T O
authors.initials: TO
authors.lastname: Rooney
authors.affiliation: Deptartment of Marine Sciences, University of Connecticut, Groton, CT 06340, USA.
authors.forename: E
authors.initials: E
authors.lastname: Seeley
authors.affiliation: Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: E W
authors.initials: EW
authors.lastname: Jackson
authors.affiliation: Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: Z M
authors.initials: ZM
authors.lastname: Durham