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- W2078143740 abstract "Data from the 1978 “Cobblestone Project” Deep Tow surveys and associated intensive sampling programs have been combined with published data to address the question: “Are the Mediterranean- and Calabrian Ridge convergent plate margin accretionary prisms?”. A dome-shaped feature on the crest of the Mediterranean Ridge was found to be made of sticky and watery mud breccia of Early Cretaceous age. Its circular plan view, concentric surface deformation, old but uniform-aged clasts and matrix, diachronous Quaternary veneer, brecciated texture and plastic matrix suggest a piercement structure, but the total lack of evaporitic or dolomitic lithologies, the thinness of both Messinian evaporites and Plio-Quaternary cover in the observation area and the great age and presumably great depth of the Cretaceous mother bed, rule out simple salt diapirism. We suggest instead that the diapir rose from the overpressured zone at the base of a deep seated overthrust, where grinding and injection of water shattered a low permeability shale layer and reduced its density and effective viscosity. The perimeters of the Calabrian- and Mediterranean Ridge are marked by an abrupt transition (“deformation front”) from flat abyssal plains to ridge-and-trough morphology. The deformation front apparently migrates outward with time and is the site of uplift and folding of abyssal plain sediments: A search for analogous “deformation fronts” in better understood convergent plate margins revealed a very close analogy with the toe of the Curacao- and Barbados Ridge which are interpreted as classic accretionary wedges. The analogy is further supported in the Calabrian Ridge case by the observation of an arcward-dipping reflector, which may be the detachment surface, beneath a thickening wedge of Messinian evaporites. Extension of the analogy requires that the outcrop of the subduction zone or the site of initiation of decollement be located external to the Mediterranean Ridge and not in the Hellenic Trough. Our surveys showed that (except possibly along the recently deformed outermost perimeter of the deformation front) the surface of both ridges is extensively modified by the secondary processes of diapirism, dissolution, mass-wasting and downhill gliding. Thus the fine-scale surface morphology alone, as revealed by Seabeam, Deep-Tow or GLORIA, may be a poor or misleading indicator of deep crustal processes in this region." @default.
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- W2078143740 date "1982-06-01" @default.
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- W2078143740 title "Geological evidence concerning compressional tectonics in the eastern mediterranean" @default.
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- W2078143740 doi "https://doi.org/10.1016/0040-1951(82)90068-3" @default.
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