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Detailed patrems of near surface tectonics and heat flow were investigated at two locations at the toe of the Barbados Ridge accretionary prism. At the two locations, in the thickly sedimented southern portion of the prism near 12ø202q and in the northern area drilled during Ocean Drilling Program (ODP) leg 110 near 15ø322q, relative highs of heat flow were associated with zones of thrusting. We attribute them to upward advection of water rising from the d6collement along faults through the sediments. In the ODP area, a significant heating plate effect from warm fluids flowing along the d6collement and thrusts is required to account for the high regional heat flow. This effect implies high rates of fluid flow at the d6collement, which can only be non-steady state or would require massive lateral transport of fluids along strike. Paper number 90IB00828.0148-0227/90/90JB00828505.00 decrease in heat flow to the background value over a lateral distance of 300 m. Although the heat flow profile does not extend all the way across the second thrust-outcrop wedge farther upslope, the two westernmost measurements suggest that a similar heat flow anomaly is associated with this upper wedge.The only reasonable explanation that we find for this anomaly, in particular because of its short wavelength, is upward fluid 8859 J.P. Foucher, D6partement de G6osciences Marines

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