Detailed investigation of the overlapping spreading center and 9 degrees north on the East Pacific Rise: overview of the Medusa 2007 cruise activities

Details Detailed investigation of the overlapping spreading center and 9 degrees north on the East Pacific Rise: overview of the Medusa 2007 cruise activities Detailed investigation of the overlapping spreading center and 9 degrees north on the East Pacific Rise: overview of the Medusa 2007 cruise activities

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.t32b..03k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #T32B-03

Mathematics

Logic

1021 Composition Of The Oceanic Crust, 8149 Planetary Tectonics (5475), 8158 Plate Motions: Present And Recent (3040), 8178 Tectonics And Magmatism

Scientific paper

We undertook a 35-day cruise on the R/V Atlantis (AT15-17; March 24 to April 27, 2007) to investigate seafloor spreading processes along the northern East Pacific Rise. The bulk of our ship time (22 science days) was devoted to studying the 9 deg 03"N overlapping spreading center (OSC). At the OSC site, we surveyed 200 sq. km. with DSL-120A (obtaining 120 kHz backscatter and phase bathymetry, 200 kHz multibeam bathymetry, magnetics, CTD, and MAPR data). This was followed by 16 days of mapping and sampling with ROV Jason II (~7000 digital photographs, recovery of ~300 rock samples, sampling of hydrothermal vent waters and biota) and with the WHOI TowCam (~10,000 digital photographs, CTD and MAPR data). We discovered one high-temperature hydrothermal vent (named "Medusa Vent" to highlight the presence of unusual pink Stauromedusae) and an associated diffuse- flow hydrothermal field (biologic samples included riftia, tevnia, alvinella). We found no evidence of widespread recent eruptions, although loci of recent volcanism were identified on each limb of the OSC. Lavas recovered ranged from basalt to dacite. The data collected will be used to explore the linkages between geochemical, geological, and hydrothermal variations on the seafloor and the subsurface magma supply system at depth. Our preliminary results suggest a complex spatial relationship between magmatism, tectonism and hydrothermal activity observed at the surface and the positions and characteristics of the magma lenses at depth.

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