recent PRISMED II geophysical survey has documented various styles of salt
tectonics in and around the Nile deep-sea fan (Eastern Mediterranean Sea).
The first main type of salt-related structures comprises listric normal
growth faults and grabens, trending roughly perpendicular to the slope line
of the Nile Cone. These faults and associated salt structures result from
thin-skinned extension, driven by gravity gliding and spreading as a result
of sediment loading of the Plio-Quaternary overburden above the Messinian
evaporites, which acted as a decollement layer.
second major type of salt structures consists of lineaments that obliquely
intersect the continental slope of the Nile deep-sea fan. These structures
may have had some strike-slip movement, and salt diapirs grew reactively
or were deformed by fault-block movement. In the western distal part of
the Nile deep-sea fan, compressional tectonics of the adjacent Mediterranean
Ridge caused the formation of a series of salt-cored folds and reverse faults
above the Messinian evaporites. In the eastern distal part of the Nile Cone,
sediment progradation progressively expelled salt northward, first forming
small folds and tight diapirs, then a scarp of 400m height around the Eratosthenes
Seamount, corresponding to the basinward limit of salt deformation.