On the petrography, mineralogy and fluid inclusion composition of early speleothem generation from the Koněprusy Cave and some localities nearby


Václav Suchý, Petr Dobeš, Antonín Zeman

Geoscience Research Reports 47, 2014 (GRR for 2013), pages 140–143
Map sheets: Beroun (12-41)

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We document that the early generations of carbonate cave sinters of the Bohemian Karst contain layers of bizarre calcite crystals (gothic-arch and feathery-like calcite), calcite pseudomorphs after aragonite (square-ended crystals and needle botryoids), and siliceous cores of the speleothems. These features may collectively indicate sinter deposition from hot and/or warm waters in a way similar to present-day hot spring travertine or geyserite. Fluid inclusions entrapped in both carbonate and siliceous layers reveal that the crystallization of the sinters occurred from low salinity (< 3 wt. % NaCl equiv.) solutions in the environment where the sinter surface was intermittently wet and dry.


Bodnar, R. J. (1993): Revised equation and table for determining the freezing point depression of H2O-NaCl solutions. - Geochim. cosmochim. Acta 57, 683-684.

Borisenko, A. S. (1977): Study of salt composition of fluid inclusions in minerals using cryometric technique. - Geol. Geofiz. 8,16-27 (in Russian).

Davis, D. W. - Lowenstein, T. M. - Spencer, R. J. (1990): Meeting behaviour of fluid inclusions in laboratory-grown halite crystals in the system NaCl-H2O, NaCl-KCl H2O, NaCl-MgCl2-H2O, and NaCl-CaCl2-H2O. - Geochim. cosmochim. Acta 57, 683-684.

Folk, R. L. - Asserto, R. (1976): Comparative fabrics of length-slow and length-fast calcite and calcitized aragonite in a Holocene speleothem, Carlsbad Caverns, New Mexico. - J. sed. Petrology 46,486-496.

Folk, R. L. - Chafetz, H. S. - Tiezi, P. A. (1985): Bizarre forms of depositional and diagenetic calcite in hot-spring travertines, Central Italy. In: Schneidermann, N.

Harris, P. M., ed.: Carbonate cements. - Soc. Econ. Paleont. Mineral., Tulsa, 349-369.

Gary, M. O. - Sharp, J. M., Jr. (2006): Volcanogenic karstification in Sistema Zacatón, Mexico. In: Perspectives on karst geomorphology, hydrology, and geochemistry. A tribute volume to Derek C. Ford and William B. White. - Geol. Soc. Amer. Spec. Paper 404, 79-89.

Guo, L. - Riding, R. (1992): Aragonite laminae in hot water travertine crusts, Rapolano Terme, Italy. - Sedimentology 39, 1067-1079.

Jones, B. - Renaut, R. W. - Rosen, M. R. (1996): High-temperature (>90 °C) calcite precipitation at Waikite Hot Springs, North Island, New Zealand. - J. Geol. Soc. 153, 481-496.

Lynne, B. Y. (2013): Siliceous sinter: an early exploration tool and direct link to ageothermal reservoir. In: Proceedings, Thirty-Eight Workshop on Geothermal Reservoir Engineering. February 11-13, 2013, SGP-TR-198. - Stanford Univ., Stanford, California.

Lysenko, V. - Slačík, J. (1977): Příspěvek k sukcesi minerální výplně Koněpruských jeskyní. - Čas. Mineral. Geol. 22, 307-315.

Suchý, V. - Zeman, A. (1999): Hydrotermální původ jeskyní v Českém krasu: nové paradigma. - Acta Mus. Morav., Sci. geol. 84, 97-119.

Tucker, M. E. - Wright, V. P. (1990): Carbonate Sedimentology. - 482 str. Blackwell. Oxford - London.