Structure of oceanic core complexes: Constraints from seafloor gravity measurements made at the Atlantis Massif

Details Structure of oceanic core complexes: Constraints from seafloor gravity measurements made at the Atlantis Massif Structure of oceanic core complexes: Constraints from seafloor gravity measurements made at the Atlantis Massif

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30h..29n&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 8, pp. 29-1, CiteID 1446, DOI 10.1029/2003GL017126

Physics

Geophysics

4

Marine Geology And Geophysics: Gravity, Marine Geology And Geophysics: Instruments And Techniques, Geodesy And Gravity: Local Gravity Anomalies And Crustal Structure, Tectonophysics: Plate Boundary-General (3040), Information Related To Geographic Region: Atlantic Ocean

Scientific paper

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 Mid-Atlantic 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 quasi 3-D forward models suggests that symmetric east and west-dipping density interfaces bound the core of the massif with dip angles of 16°-24° in the east and 16°-28° in the west, creating a wedge with a density of 3150-3250 kg/m3. The dip angle in the east is steeper than that of the surface slope, suggesting that the detachment fault surface does not coincide with the density boundary. The resulting low-density layer is interpreted as a zone of serpentinization.

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