[1] Using the DSV Alvin, the relative seafloor gravimeter ROVDOG was deployed at 18 sites on the Atlantis Massif (located at the ridge-transform intersection of the MidAtlantic Ridge and the Atlantis Transform Fault near 30 N, 42 W). These data along with previously collected shipboard gravity and bathymetry provide constraints on the density structure of this oceanic core complex. A series of ...

The atmosphere of Titan represents a bridge between the early solar nebula and atmospheres like ours. The low abundances of primordial noble gases in Titan's atmosphere relative to N2 suggest that the icy planetesimals that formed the satellite must have originated at temperatures higher than 75-100 K. Under these conditions, N2 would also be very poorly trapped and thus Titan's nitrogen, like ...

[1] Seismic reflection profiles shot across the Cascadia forearc show that a 5–15 km thick band of reflections, previously interpreted as a lower crustal shear zone above the subducting Juan de Fuca plate, extends into the upper mantle of the North American plate, reaching depths of at least 50 km. In the extreme western corner of the mantle wedge, these reflectors occur in rocks with P wave ve...

Electrochemical Capacitance of Serpentinizing Hydrothermal Systems Steve Vance Jet Propulsion Laboratory, Caltech, MS 183-401, 4800 Oak Grove Dr., Pasadena, CA 91024 ([email protected]) Differentiated icy satellites and dwarf planets in the size range R ≈ 250− 2000 km constitute a special class of objects sufficiently large for anhydrous and chemically reducing rocky interiors to result from ...