Scientific article

Quantification of tsunami-induced flows on a Mediterranean carbonate ramp reveals catastrophic evolution

Published inEarth and planetary science letters, vol. 444, p. 192-204
Publication date2016

Cool-water carbonates are the dominant limestones in the Mediterranean Basin since the Early Pliocene. Their deposition typically resulted in ramp morphologies due to high rates of resedimentation. Several such fossil carbonate ramps are characterised by a bimodal facies stacking pattern, where background deposition of subaqueous dune and/or tempestite deposits is repeatedly interrupted by anomalously thick sedimentary units, dominated by backset-stratification formed by supercritical flows. A multitude of exceptional triggers (e.g. storms, floods, tsunamis) have been invoked to explain the origin of these supercritical flows, which, in the absence of a quantitative analysis, remains speculative as yet. Here, for the first time, the catastrophic evolution of one such Mediterranean carbonate ramp, on Favignana Island (Italy), is quantified by combining 87Sr/86Sr dating, outcrop-based palaeoflow reconstructions and hydraulic calculations. We demonstrate that rare tsunami-induced flows, occurring on average once every 14 to 35 kyr, lasting a few hours only, deposited the anomalously thick backset-bedded units that form half of the sedimentary record. In between such events, cumulative two years of storm-induced flows deposited the remaining half of the succession by the stacking of subaqueous dunes. The two to four orders of magnitude difference in average recurrence period between the two flow types, and their associated sedimentation rates, emphasises the genetic differences between the two styles of deposition. In terms of sediment transport, the studied carbonate ramp was inactive for at least 99% of the time with gradual progradation during decennial to centennial storm activity. Carbonate ramp evolution attained a catastrophic signature by the contribution of rare tsunamis, producing short-lived, high-energy sediment gravity flows.

  • Carbonate ramp
  • Mediterranean
  • Tsunami
  • Storm
  • Supercritical flow
  • Catastrophic evolution
Citation (ISO format)
SLOOTMAN, Arnoud et al. Quantification of tsunami-induced flows on a Mediterranean carbonate ramp reveals catastrophic evolution. In: Earth and planetary science letters, 2016, vol. 444, p. 192–204. doi: 10.1016/j.epsl.2016.03.052
Main files (1)
Article (Published version)
ISSN of the journal0012-821X

Technical informations

Creation05/13/2016 1:46:00 PM
First validation05/13/2016 1:46:00 PM
Update time03/15/2023 12:20:28 AM
Status update03/15/2023 12:20:27 AM
Last indexation05/02/2024 5:26:19 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack