Abstract
Clasts of laminated sediment have been found inside a rare occurrence of fossil gas blowout pipes penetrating Plio-Pleistocene marine sediments exposed along the northeast coast of the island of Rhodos (Greece). Anisotropy of magnetic susceptibility characteristics of the clasts are comparable to the stratigraphically higher source rock, indicating that erosion, transportation and deposition of the clast material did not cause significant modification of the sediment fabric. The source rock carries an NRM composed of a low-coercivity Brunhes component, overprinting a reversed polarity component of Kaena sub-chron age. NRM of the conglomerate blocks is dominated by a single normal polarity magnetisation, with a few samples apparently carrying unresolved, high-coercivity components of reversed polarity. The magnetisation characteristics of the clasts are thus at variance with those of the source rocks, implying complete to partial remagnetisation of these non-lithified sediments. The origin of this magnetisation imposed at the time of clast deposition is tentatively concluded to be due to rotational re-alignment of magnetic grains comparable to the mechanism at work in the poorly understood shear and/or shock remanent magnetisation.
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