Growth of a Sloperidge and its Control on Sedimentation: Paola Slope Basin (Eastern Tyrrhenian Margin)

  1. L. E. Frostick2 and
  2. R. J. Steel3
  1. A. Argnani and
  2. F. Trincardi

Published Online: 16 APR 2009

DOI: 10.1002/9781444304053.ch23

Tectonic Controls and Signatures in Sedimentary Successions

Tectonic Controls and Signatures in Sedimentary Successions

How to Cite

Argnani, A. and Trincardi, F. (1994) Growth of a Sloperidge and its Control on Sedimentation: Paola Slope Basin (Eastern Tyrrhenian Margin), in Tectonic Controls and Signatures in Sedimentary Successions (eds L. E. Frostick and R. J. Steel), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304053.ch23

Editor Information

  1. 2

    Reading, UK

  2. 3

    Bergen, Norway

Author Information

  1. Istituto per la Geologia Marina — CNR, Via Zamboni 65, 40127 Bologna, Italy

Publication History

  1. Published Online: 16 APR 2009
  2. Published Print: 28 FEB 1994

ISBN Information

Print ISBN: 9780632037452

Online ISBN: 9781444304053

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Keywords:

  • slope ridge growth and control on sedimentation;
  • Paolo slope basin, eastern Tyrrhenian margin;
  • evidence of contraction;
  • Paola basin sedimentary fill;
  • base-of- slope area;
  • Ebro margin

Summary

The Tyrrhenian Sea is a Neogene back-arc basin originated within the Africa–Europe continental collision zone and is characterized by the presence of several slope basins. Paola Basin is one of these slope basins and is located on the eastern margin of the Tyrrhenian Sea. It is small (70 × 20 km), confined, and bounded seawards by a composite slope ridge. The sector of the eastern Tyrrhenian margin where Paola Basin is located presents the thickest Plio-Quaternary sedimentary succession among the peri-Tyrrhenian basins because of its proximity to the rapidly uplifting Calabrian Arc. The sedimentary evolution of this area is broadly divided into three stages by the development of a sedimentary ridge.

The unit deposited during the first stage represents a thick basin-margin wedge which prograded during the Pliocene. This wedge was deformed by a regional contractional episode and detached from its basement. As a result, a sediment ridge was constructed and a slope basin was defined. The second stage unit originated during ridge growth and shows wedging of reflectors.

The infilling of the slope basin represents the last stage of evolution and shows a greater variety of seismic facies compared with the two previous stages. A suite of sedimentary bodies with facies typical of coarse-grained deposits occurs at the base of slope and indicates multiple proximal sediment sources along the basin margin that shifted in position through time. Channelized and mounded deposits, as well as ponded distal turbidites, fill morphological depressions while, at the same time, morphological highs are mantled by thick sedimentary drapes. This variability in facies reflects the complex interaction of the steepening of the basin margin, due to contraction, of the topographical confinement exerted by the ridge, and of the onset of Quaternary sea-level fluctuations.