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Rendiconti Lincei

, Volume 25, Supplement 2, pp 167–176 | Cite as

Drainage system adjustment in response to the opening of the Rieti intermontane basin (Central Italy): geostatistical reconstruction of the PaleoFarfa River alluvial plain

  • Giandomenico FubelliEmail author
  • Marta Della Seta
  • Gabriele Amato
Intermontane basins in central-southern Italy

Abstract

The Rieti intermontane basin is one of the western tectonic depressions of the Central Apennines. Its infilling deposits are currently cut by the Farfa River, a left tributary of the Tiber River with a 132 km2 wide drainage basin. It currently flows from the Sabini Mts. (Central Apennines) into the Tiber River to the WSW. In the upper basin, the river cuts fluvial conglomerates and sands, which are Gelasian in age. Downstream, on the left side of the Tiber Valley, the facies show deltaic to clearly marine characteristics that indicate the presence of the Gelasian paleo-shoreline, which is also indicated by the finding of Lithodomus holes in the calcareous bedrock at an elevation of 260–277 m a.s.l. The shape of the Gelasian alluvial plain and delta has been outlined and redrawn via GIS techniques. We herein underline that during the Gelasian, the shoreline was located at the foot of the Fara in Sabina Mts. and that the alluvial plain of the PaleoFarfa River was much wider (approximately 700 km2) than the present, extending to the foot of the Reatini Mts. The reconstruction of both the basal and top surfaces of the old alluvial body provides evidence that the activity of Quaternary faults, responsible for the formation of the Rieti intermontane basin, strongly influenced the deposition of the alluvial body and finally caused the adjustment of the PaleoFarfa drainage system. Finally, from the shoreline elevation, a Pleistocene averaged uplift rate of 0.12/0.14 mm/year has been calculated for this sector of the Apennines.

Keywords

Rieti intermontane basin Drainage system Geomorphic markers Geostatistical analysis Uplift 

Notes

Acknowledgments

The authors are grateful to the anonymous referees whose contribution has been appreciated. This work was funded by the Sapienza University 2013 project “Quantitative and integrated approach to the morpho-evolutionary analysis of tectonically active areas in central Apennines (Italy): morpho-chronological constraints and implications for natural hazards” (P.I.: Dr. Marta Della Seta).

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Copyright information

© Accademia Nazionale dei Lincei 2014

Authors and Affiliations

  • Giandomenico Fubelli
    • 1
    Email author
  • Marta Della Seta
    • 2
  • Gabriele Amato
    • 1
  1. 1.Department of SciencesRoma Tre UniversityRomeItaly
  2. 2.Department of Earth SciencesSapienza University of RomeRomeItaly

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