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Fields of multi-kilometer scale sub-circular depressions in the Carnegie Ridge sedimentary blanket: Effect of underwater carbonate dissolution?

AuthorsMichaud, F.; Chabert, Anne; Collot, Jean-Yves; Sallarès, Valentí CSIC ORCID ; Flueh, E.; Charvis, P.; Graindorge, David; Gustcher, Marc-André; Bialas, J.
Carbonate dissolution
Volcanic ridge
Issue DateMay-2005
CitationMarine Geology 216(4): 205-219 (2005)
AbstractOffshore Ecuador, the Carnegie Ridge is a volcanic ridge with a carbonate sediment drape. During the SALIERI Cruise, multibeam bathymetry was collected across Carnegie Ridge with the Simrad EM120 of the R/V SONNE. The most conspicuous features discovered on the Carnegie Ridge are fields of circular closed depressions widely distributed along the mid-slope of the northern and southern flanks of the ridge between 1500 and 2600 m water depth. These circular depressions are 1–4 km wide and typically 100–400 m deep. Most are flat floored and some are so densely packed that they form a honeycomb pattern. The depressions were carved into the ridge sedimentary blanket, which consists of carbonate sediment and has been dated from upper Miocene to upper Pleistocene. Several hypotheses including pockmark origin, sediment creeping, paleo-topography of the volcanic basement, effects of subbottom currents, and both marine and subaerial karstic origins are discussed. We believe that underwater dissolution process merits the most serious consideration regarding the origin of the closed depression
Description15 pages, 7 figures
Publisher version (URL)https://doi.org/10.1016/j.margeo.2005.01.003
Identifiersdoi: 10.1016/j.margeo.2005.01.003
issn: 0025-3227
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