@misc{79223, type = "Article", year = "2021", title = "Echofacies interpretation of Pleistocene to Holocene contourites on the Demerara plateau and abyssal plain", journal = "Interpretation-a Journal Of Subsurface Characterization", editor = "Society of Exploration Geophysicists", volume = "9", number = "2", pages = "SB49-SB65", author = "Tallobre Cédric, Loncke Lies, Droz Laurence, Marsset Tania, Uusõue Mirjam, Roest Walter, Fanget Anne-Sophie, Bassetti Maria-Angela, Giresse Pierre, Bayon Germain", url = "", organization = "", address = "FRANCE, ESTONIA", doi = "https://doi.org/10.1190/INT-2020-0159.1", abstract = "
Off French Guiana and Surinam, NADW and AABW oceanic currents contour the Demerara marginal plateau, which promotes the formation of contourites. We have studied these contourites thanks to a new compilation of high-resolution sub-bottom profiles calibrated by sedimentary cores. The echo-facies and isopach maps we constructed highlight a sedimentary distribution parallel to the isobaths. The presence of moats along the slope is confirmed by the observation of parallel, elongated, sedimentary depleted zones and echo-facies strongly affected by diffraction hyperbola and transparent echo-facies. We interpret these features to be related to eroded slopes and Mass Transport Deposits. In contrast, the sedimentary drifts we mapped are characterized by elongated and thick slope-parallel depocentres displaying bedded echo-facies with wave-like bedforms. According to our interpretation, they result from interactions between currents and the seafloor. Seismic wipe-outs frequently affect those drifts, possibly resulting from high water or organic contents.
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