Physics – Geophysics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3717304s&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 17, CiteID L17304
Physics
Geophysics
1
Marine Geology And Geophysics: Oceanic Hotspots And Intraplate Volcanism, Tectonophysics: Dynamics: Gravity And Tectonics, Geodesy And Gravity: Tectonic Deformation (6924), Structural Geology: Fractures And Faults
Scientific paper
Ninetyeast Ridge (NER) is a linear volcanic ridge in the Indian Ocean thought to have formed by hotspot volcanism on the northward-drifting Indian plate. Geological data from the ridge are sparse, so its tectonic evolution is poorly known. We studied satellite-derived gravity data, seismic reflection profiles, and multibeam bathymetry to examine NER structure. Gravity data show that the ridge displays a series of nearly E-W trending lineations with average spacing ˜0.4° (45 km). In seismic and bathymetry data, these lineations correlate with horsts and grabens that probably formed near the time of ridge emplacement. From their extensional nature and trends, we infer that these faulted structures formed near the spreading ridge that separated the Indian and Antarctic plates and their ubiquity implies the hotspot was never far from this spreading ridge.
Eisin A. E.
Frey Frederick A.
Gopala Rao D.
Krishna K. S.
Levchenko O.
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