Subsurface flux adjustments and speleogenesis as inferred from sediment traps in major Lebanese cave systems

Authors

  • Carole Nehme
  • Stephane Jaillet
  • Jean-Jacques Delannoy
  • Mazen Azouni
  • Rita Stephan
  • Tony Comaty

DOI:

https://doi.org/10.3986/ac.v44i1.1149

Abstract

Caves are natural sediments traps that enclose several types of allochtonous and authoctonous deposits. Study of sediments in caves help to reconstitute the hydrological functioning of caves. In Lebanon, Kessarat and Jeita horizontal caves comprise sediments traps related to collapse and/or to passages enlargements with new passages formed during the alluviation process. A speleogenic study combined with the grain-size analysis of the sedimentary sequence in the Junction Chamber (Kassarat cave) and in the Entrance Gallery (Jeita lower cave) helped to identify several stages of sediment deposition and to define types of paleoflow adjustments during and after the ceiling collapse. In this paper, we discuss the control of cave conduits on several processes: i) the flow dynamic adjustments; ii) the spatial and temporal distribution of deposits in the cave systems and, iii) the magnitude of the environmental signal recorded in sedimentary sequences. The study highlights the importance to consider the geomorphological context of sediments traps when interpreting the evolution of subsurface flows and when relating sediment inputs in caves to external environmental changes.

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Published

2015-07-09

How to Cite

Nehme, C., Jaillet, S., Delannoy, J.-J., Azouni, M., Stephan, R., & Comaty, T. (2015). Subsurface flux adjustments and speleogenesis as inferred from sediment traps in major Lebanese cave systems. Acta Carsologica, 44(1). https://doi.org/10.3986/ac.v44i1.1149

Issue

Section

Original papers