Segmentation of the Lesser Antilles subduction zone

Details Segmentation of the Lesser Antilles subduction zone Segmentation of the Lesser Antilles subduction zone

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..71..297w&link_type=abstract

Earth and Planetary Science Letters, Volume 71, Issue 2, p. 297-304.

Physics

27

Scientific paper

Precise hypocentral locations of earthquakes recorded on local seismic networks from 1978 to 1984 have established the configuration of the Benioff zone beneath the Lesser Antilles island arc. There are two distinct segments to the zone: one to the north of Martinique which trends NNW and one to the south of St. Lucia which trends NNE. The northern zone dips at 60-50°. The southern zone has a dip of 50-45° in the north but is vertical in the south. Pleistocene volcanoes are aligned in distinct segments which closely mirror the kink in the Benioff zone. Mid-Miocene swarms of dykes in Martinique and St. Lucia have NW and NE azimuthal modes respectively. We interpret this to mean that this kink in the subduction zone existed as long ago as the Miocene. The kink may represent the deformation of a single subducting plate or two separate North and South American plates subducting beneath the Caribbean plate with a triple junction in the region of Martinique-St. Lucia.

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