Palygorskite as a sediment dispersal tracer in the eastern Mediterranean

Palygorskite is a clay mineral widely distributed in late Quaternary deposits of the eastern Mediterranean, where, locally, it proves an ideal tracer of sediment dispersal. This study shows that the origin of this mineral is not limited to African sources. Cores containing late Pleistocene to recent sediment record the transport of palygorskite from the Plain of Helos on the Peloponnesus to specific deep basins along the Hellenic Arc. Palygorskite, commonly concentrated in the silt size fraction, may be overlooked in studies that focus only on the <2 μm fraction. In this region we find that the detrial palygorskite distribution is partially controlled by size-sorting effects related to gravity-induced transport processes. In consequence, comprehensive compositional analyses should be made both on the silt and clay fractions.