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The Frasassi Caves: A “Classical” Active Hypogenic Cave

  • Sandro GaldenziEmail author
  • Daniel S. Jones
Chapter
Part of the Cave and Karst Systems of the World book series (CAKASYWO)

Abstract

The Frasassi caves present a unique opportunity to study sulfuric acid speleogenesis in a large karst system that contains active sulfidic processes as well as relict features produced by past speleogenetic episodes. The caves consist of a network of ramifying, mainly subhorizontal passages that reach more than 30 km in total length, and are organized in superimposed and interconnected levels. Sulfidic groundwaters are accessible in the lowermost levels. The water chemistry in the shallow phreatic zone is influenced by mixing phenomena between the sulfidic groundwaters and descending oxygenated water and, to some extent, gas exchange with the cave atmosphere. The sulfidic waters are corrosive with respect to limestone, with average limestone dissolution rates around 100 mm 10−3 year−1 for submerged tablets. The release of gases to the air also causes wall corrosion (linear corrosion rate up to 85 mm 10−3 year−1), which produces gypsum replacement crusts above the water table. Morphological and isotopic analyses show that large relict gypsum deposits in the upper dry levels were created by the same mechanism. Sulfide-oxidizing chemosynthetic bacteria living in the cave produce organic matter and support a rich and diverse ecosystem in the sulfidic branches, and these microorganisms contribute to sulfur cycling and cave formation processes. The evolution of the older cave levels during the Pleistocene was a complex result of changing regional geomorphological and hydrogeological regimes as well as local factors that affect water movement and gas exchange in the shallow phreatic zone within the cave.

Keywords

Frasassi caves Hypogenic caves Sulfidic water Apennine Italy 

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.JesiItaly
  2. 2.BioTechnology Institute & Department of Earth SciencesUniversity of MinnesotaMinneapolisUSA

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