Sub-B'' layering in the Southern Caribbean: The Aruba Gap and Venezuela Basin

Details Sub-B'' layering in the Southern Caribbean: The Aruba Gap and Venezuela Basin Sub-B'' layering in the Southern Caribbean: The Aruba Gap and Venezuela Basin

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..53..131s&link_type=abstract

Earth and Planetary Science Letters, Volume 53, Issue 2, p. 131-146.

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Scientific paper

Multichannel seismic data in the Aruba Gap region near JOIDES/DSDP Site 153 verify the presence of a deep sub-B'' reflection. One multichannel seismic line trends NE-SW on and along the edge of Beata Ridge and passes within 1 km of Site 153, and another line runs N-S across the entire Aruba Gap with the drill site 4 km east from its northern end. Closely spaced velocity analyses indicate the presence of deep primary reflection events and enable calculation of interval velocities between the A''-B'' marker horizons. Deconvolved, true amplitude, normal incidence profiles sharply delineate the A''-B'' marker horizons and indicate the presence of the sub-B'' reflection event. On the NE-SW line, this deep reflector is best described as a ``diffuse'' discontinuous zone, relatively horizontal, lying about 0.8 seconds of two-way travel time below the B'' reflector, with an interval velocity of approximately 5.0 km/s between Horizon B'' and this reflection. The N-S line is more complex since the sub-B'' reflection event is masked by a strong internal multiple from the A''-B'' interval. In the central and western Venezuela Basin, deep primary reflections beneath Horizon B'' are also observed on the northern and western sides of what appears to be a major fault zone. This fault zone separates the smooth B'' and sub-B'' reflectors on the northern and western sides of this fault zone from what appears to be typical oceanic basement. The widespread presence of sub-B'' reflections yielding high interval velocities for the section between these events and Horizon B'' suggest that this material is probably igneous in origin.

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