Kraushohle (Garns. Styria, Austria) is the only current\y known sulfuric acid cave in the Eastem Alps. Cupolas, ceiling partings and portals, ceiling channels, replacement pockets. Horizontal orrosion/convection notches, sulfuric acid karren, blind chimneys. incomplete dissolution walls, drip holes and cup shaped hollows in tbe floor are the most striking morphological features in this cave. Mineralogical analysis showed the presence, besides calcite, of gypsum, gibbsite, opaline, jarosite, metaluno,ene, hydroxylapatite, halloysite, and alunite. The timing of speleogenesis was preliminary determined, using 40Ar/39 Ar dating of alunite, a product of acid limestone weatbering, to 80 ka +1- 80 (the cave is thus younger than 160 ka). Preliminary U-Th dates of calcitic stalagmites indicate a minimum age of gypsum deposition of 52 ka. Stable isotope data of these speleothem are consistent with an epigenic origin of the drip water at that rime.
Kraushöhle (Austria): morphology and mineralogy of an alpine sulfuric acid cave / De Waele, J.; Plan, L.; Audra, P.; Rossi, Antonio; Spötl, C.; Polyak, V.; Mcintosh, B.. - STAMPA. - 2:(2009), pp. 831-837. (Intervento presentato al convegno 15th International Congress of Speleology tenutosi a Kerrville (Texas) nel July 19-26, 2009).
Kraushöhle (Austria): morphology and mineralogy of an alpine sulfuric acid cave
ROSSI, Antonio;
2009
Abstract
Kraushohle (Garns. Styria, Austria) is the only current\y known sulfuric acid cave in the Eastem Alps. Cupolas, ceiling partings and portals, ceiling channels, replacement pockets. Horizontal orrosion/convection notches, sulfuric acid karren, blind chimneys. incomplete dissolution walls, drip holes and cup shaped hollows in tbe floor are the most striking morphological features in this cave. Mineralogical analysis showed the presence, besides calcite, of gypsum, gibbsite, opaline, jarosite, metaluno,ene, hydroxylapatite, halloysite, and alunite. The timing of speleogenesis was preliminary determined, using 40Ar/39 Ar dating of alunite, a product of acid limestone weatbering, to 80 ka +1- 80 (the cave is thus younger than 160 ka). Preliminary U-Th dates of calcitic stalagmites indicate a minimum age of gypsum deposition of 52 ka. Stable isotope data of these speleothem are consistent with an epigenic origin of the drip water at that rime.
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