Geological interpretation of combined Seabeam,Gloria and seismic data from Anegada Passage (Virgin Islands,north Caribbean) |
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| Authors: | I Jany K M Scanlon A Mauffret |
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| Institution: | 1. Département de Géologie Océanique, Université Pierre et Marie Curie, 4 Place Jussieu, 75252, Paris Cedex 05, France
2. Branch of Atlantic Geology, U.S. Geological Survey, 02543, Woods Hole, U.S.A.
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| Abstract: | The Anegada Passage (sensu lato) includes several basins and ridges from Southeast of Puerto Rico to the corner of the Virgin Islands Platform. Seabeam (Seacarib I) and Gloria long-range sidescan sonar surveys were carried out in this area. These new data allow us to propose an interpretation of the Anegada Passage.Most of the features described are related to wrench faulting:| (a) |
St Croix and Virgin Islands Basins are pull-apart basins created in a right-lateral strike-slip environment based on their rhomboidal shape and seismic data (e.g. the flower structure). These two pull-aparts are divided into two sub-basins by a curvilinear normal fault in the Virgin Islands Basin and a right-lateral strike-slip fault in the St Croix Basin.
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Tortola Ridge and a  dog's leg shaped structure are inferred to be restraining bends between two right-lateral strike-slip faults.
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We identified two ENE-WSW volcanic lineaments in the eastern area and one volcano lying between Virgin Islands and St Croix Basins.
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As shown by the seismic activity main wrench motion occurs along the north slope of Virgin Islands Basin and through Anegada Passage. A branching of this main fault transmits the transtensional motion to St Croix Basin.
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| Keywords: | Anegada Passage North Caribbean Sea Seabeam Gloria Pull-apart basin Tectonic escape |
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