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Speleology in Kazakhstan

Shakalov on 04 Jul, 2018
Hello everyone!   I pleased to invite you to the official site of Central Asian Karstic-Speleological commission ("Kaspeko")   There, we regularly publish reports about our expeditions, articles and reports on speleotopics, lecture course for instructors, photos etc. ...

New publications on hypogene speleogenesis

Klimchouk on 26 Mar, 2012
Dear Colleagues, This is to draw your attention to several recent publications added to KarstBase, relevant to hypogenic karst/speleogenesis: Corrosion of limestone tablets in sulfidic ground-water: measurements and speleogenetic implications Galdenzi,

The deepest terrestrial animal

Klimchouk on 23 Feb, 2012
A recent publication of Spanish researchers describes the biology of Krubera Cave, including the deepest terrestrial animal ever found: Jordana, Rafael; Baquero, Enrique; Reboleira, Sofía and Sendra, Alberto. ...

Caves - landscapes without light

akop on 05 Feb, 2012
Exhibition dedicated to caves is taking place in the Vienna Natural History Museum   The exhibition at the Natural History Museum presents the surprising variety of caves and cave formations such as stalactites and various crystals. ...

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That soil-covered karst is see subsoil karst.?

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KarstBase a bibliography database in karst and cave science.

Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
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Mushroom Speleothems: Stromatolites That Formed in the Absence of Phototrophs, Bontognali, Tomaso R.R.; D’Angeli Ilenia M.; Tisato, Nicola; Vasconcelos, Crisogono; Bernasconi, Stefano M.; Gonzales, Esteban R. G.; De Waele, Jo
Calculating flux to predict future cave radon concentrations, Rowberry, Matt; Marti, Xavi; Frontera, Carlos; Van De Wiel, Marco; Briestensky, Milos
Microbial mediation of complex subterranean mineral structures, Tirato, Nicola; Torriano, Stefano F.F;, Monteux, Sylvain; Sauro, Francesco; De Waele, Jo; Lavagna, Maria Luisa; D’Angeli, Ilenia Maria; Chailloux, Daniel; Renda, Michel; Eglinton, Timothy I.; Bontognali, Tomaso Renzo Rezio
Evidence of a plate-wide tectonic pressure pulse provided by extensometric monitoring in the Balkan Mountains (Bulgaria), Briestensky, Milos; Rowberry, Matt; Stemberk, Josef; Stefanov, Petar; Vozar, Jozef; Sebela, Stanka; Petro, Lubomir; Bella, Pavel; Gaal, Ludovit; Ormukov, Cholponbek;
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NSS
Journal of Cave and Karst Studies, 2009, Vol 71, Issue 1, p. 48-62
Formation of seasonal ice bodies and associated cryogenic carbonates in Caverne de l’Ours, Que ´bec, Canada: Kinetic isotope effects and pseudo-biogenic crystal structures
Abstract:
This study examines the kinetics of formation of seasonal cave ice formations (stalagmites, stalactites, hoar, curtain, and floor ice) and the associated cryogenic calcite powders in Caverne de l’Ours (QC, Canada), a shallow, thermally-responsive cave. The seasonal ice formations, which either formed by the: (1) freezing of dripping water (ice stalagmite and stalactite); (2) freezing of stagnant or slow moving water (floor ice and curtain ice) and; (3) condensation of water vapor (hoar ice), all (except floor ice) showed kinetic isotope effects associated with the rapid freezing of calcium – bicarbonate water. This was made evident in the dD, d18 O and d (deuterium excess) compositions of the formed ice where they plot along a kinetic freezing line. The cryogenic calcite powders, which are found on the surface of the seasonal ice formations, also show kinetic isotope effects. Their d13 C and d18 O values are among the highest measured in cold-climate carbonates and are caused by the rapid rate of freezing, which results in strong C-O disequilibrium between the water, dissolved C species in the water, and precipitating calcite. Although the cryogenic calcite precipitated as powders, diverse crystal habits were observed under scanning electron microscope, which included rhombs, aggregated rhombs, spheres, needles, and aggregated structures. The rhomb crystal habits were observed in samples stored and observed at room temperature, whereas the sphere and needle structures were observed in the samples kept and observed under cryogenic conditions. Considering that the formation of cryogenic calcite is purely abiotic (freezing of calcium – bicarbonate water), the presence of spherical structures, commonly associated with biotic processes, might represent vaterite, a polymorph of calcite stable only at low temperatures. It is therefore suggested that care should be taken before suggesting biological origin to calcite precipitates based solely on crystal habits because they might represent pseudo-biogenic structures formed through abiotic processes.