Soft-sediment deformation structures in seismically affected deep-sea Miocene turbidites (Cilento Basin, southern Italy)
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Date
2014-06-30
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Bogucki Wydawnictwo Naukowe
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Abstract
Soft-sediment deformation structures (SSDS) are widespread in the upper part of the S. Mauro Formation (Cilento
Group, Middle-Late Miocene). The succession is represented mainly by thick and very thick, massive, coarse-grained
sandstones, deposited by rapid sedimentation of high-density turbidity currents. The most common SSDS are short
pillars, dishes, sedimentary sills and convolutions. They occur mostly in the upper parts of sandstone beds. Vertical
tubes of 4–5 cm in diameter and up to 50 cm long constitute the most striking structures. They begin in the middle part
of sandstone beds, which are basically massive or contain faint dish structures. These tubes can bifurcate upwards and/
or pass into bedding-parallel veins or dikes. The vertical tubes sometimes form sand volcanoes on the then sedimentary
surface.
The SSDS are interpreted as the result of earthquake-triggered liquefaction and/or fluidisation of the turbidites that
were affected by the seismic shocks. This implies that the deformed layers should be considered as seismites.
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Keywords
High-density turbidites, Soft-sediment deformation structures, Seismites, Apennines, Cilento Group, Miocene, Italy
Citation
Geologos, 2014, 20, 2, s. 67-78
ISBN
978-83-232187-4-6