AMS fabric and tectonic evolution of Quaternary intramontane extensional basins in the Picentini Mountains (southern Apennines, Italy) |
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| Authors: | M Porreca and M Mattei |
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| Abstract: | In this work, we report the results of combined geological, structural, and anisotropy of magnetic susceptibility (AMS) studies
carried out on Quaternary deposits in the Picentini Mountains, southern Apennines (Italy). The study concerns four small continental
basins, Acerno, Tizzano, Iumaiano, and Piano del Gaudo, related to fluvial–lacustrine depositional environments, ranging in
altitude from 600 to 1,200 m a.s.l. and strongly incised during recent time. Stratigraphic and structural analyses, integrated
by low- and high-field anisotropy of magnetic susceptibility (AMS), show that the formation of these basins has been controlled
by extensional and transtensional tectonics. Most of the AMS sites exhibit a well-defined magnetic foliation parallel to the
bedding planes. A well-defined magnetic lineation has also been measured within the foliation planes. In the Iumaiano, Tizzano,
and Piano del Gaudo basins, magnetic lineations cluster around NNE–SSW trend and are parallel to the stretching directions
inferred by structural analysis of faults and fractures. On the basis of structural, sedimentological, and high-field AMS
data, we suggest a tectonic origin for the magnetic lineation, analogously to what has been observed in other weakly deformed
sediments from Neogene and Quaternary extensional basins of the Mediterranean region. Our results demonstrate that onset and
the evolution of the investigated basins have been mainly controlled since lower Pleistocene by NW–SE normal and transtensional
faults. This deformation pattern is consistent with a prevalent NE–SW extensional tectonic regime, still active in southern
Apennines, as revealed by seismological and geodetic data. |
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