Detailed structure and possible fluid paths at the toe of the Barbados accretionary wedge (ODP Leg 110 area)

Online Access: Get full text
doi: 10.1130/0091-7613(1990)018<0854:DSAPFP>2.3.CO;2
Author(s): Lallemant, Siegfried J. C.; Henry, Pierre; Le Pichon, Xavier; Foucher, Jean Paul
Author Affiliation(s): Primary:
Ec. Norm. Supér., Dép. Géol., Paris, France
Ifremer, France
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 18(9), p.854-857. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. 13 refs.; illus. incl. sketch maps
Summary: During the summer of 1987, a bottom-navigated heat-flow and deep-tow side-scan-sonar survey was carried out over the toe of the Barbados accretionary wedge, in the Ocean Drilling Program (ODP) Leg 110 drilling area. Surface traces of the Leg 110 drill holes were recognized on the sonar images. Precise relocation of the ODP holes relative to a reference multichannel seismic line led to a new interpretation of some of the structures previously described by the Leg 110 scientific party. For example, one thrust formerly interpreted as a forward-propagating major thrust is interpreted here as a near-surface backthrust developed above a probable shallow decollement located at the base of the Pleistocene sequence. We use these new structural data as surface guidelines in building a balanced cross section of and defining a fluid-flow pattern within the toe of the wedge. Using new, closely spaced heat-flow data, we discuss briefly the fluid flow along the major fractures through the wedge.
Year of Publication: 1990
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Accretionary wedges; Acoustical methods; Antilles; Atlantic Ocean; Barbados; Caribbean region; Decollement; Deep-tow methods; Faults; Fluid dynamics; Geophysical methods; Geophysical surveys; Heat flow; Leg 110; Lesser Antilles; Marine sediments; North American Atlantic; Ocean Drilling Program; Plate tectonics; Sediments; Side-scanning methods; Sonar methods; Subduction zones; Surveys; Tectonophysics; Thrust faults; West Indies
Coordinates: N152000 N154500 W0583000 W0590500
Record ID: 1990050494
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute.