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Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation

DRS at CSIR-National Institute of Oceanography

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Title Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation
 
Creator Sager, W.W.
Paul, C.F.
Krishna, K.S.
Pringle, M.S.
Eisin, A.E.
Frey, F.A.
Rao, D.G.
Levchenko, O.V.
 
Subject near-spreading ridge
lateafloor spreading
gravity data
seismic reflection profiles
 
Description 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 approx. 0.4 degrees (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
 
Date 2010-10-07T09:25:28Z
2010-10-07T09:25:28Z
2010
 
Type Journal Article
 
Identifier Geophysical Research Letters, vol.37(17); 5 pp; doi:10.1029/2010GL044347
http://drs.nio.org/drs/handle/2264/3723
 
Language en
 
Rights An edited version of this paper was published by AGU. Copyright [2010] AGU. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
 
Publisher American Geophysical Union