Surface and subsurface drainage evolution of the Corfino and Soraggio karst areas (Tuscany, Italy)

Authors

  • Giampaolo Marianelli Dipartimento di Scienze della Terra, Università degli Studi di Firenze
  • Leonardo Piccini Dipartimento di Scienze della Terra, Università degli Studi di Firenze

DOI:

https://doi.org/10.3986/ac.v40i1.32

Abstract

The Pania di Corfino and Ripa di Soraggio are two minor karst areas in Tuscany, having a surface of only 11 km2, but contain more than 100 known caves. Some caves are old epi-phreatic passages testifying to a discontinuous lowering of base level in the two major valleys that cross the carbonate outcrops: the Serchio di Soraggio and the Fiume rivers, respectively located along the NWand SE borders of the massif. The spatial-altimetric distribution of major caves, whichare found on a vertical range of a few hundreds of meters, and their relationships withthe position of surface alluvial deposits have allowed to infer a first evolutionary framework of karst during the late Quaternary. If we refer to a simple model, where fluvial deposition occurs mainly during cold stages and incision during warm stages, the discrete distribution of cave passages suggests that the different epi-phreatic phases are the responses to the alternation of cold and warm periods. In any case, the re-organization of the river network induced by the tectonic uplift had a relevant effect on cave systems. First, the underground diversion of surface drainage enhanced the downcutting of NWand SE peripheral streams, whichreceived a larger quantity of water throughkarst springs due to the favored morpho-structural setting. Successively, the backward piracy of the allogenic catchments of the karst systems by surface tributaries led to the dewatering of caves and to the present situation.

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Published

2011-05-01

How to Cite

Marianelli, G., & Piccini, L. (2011). Surface and subsurface drainage evolution of the Corfino and Soraggio karst areas (Tuscany, Italy). Acta Carsologica, 40(1). https://doi.org/10.3986/ac.v40i1.32

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Section

Original papers