Community news

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. ...

Did you know?

That flow path is the subsurface course a water molecule or solute would follow in a given ground-water velocity field.?

Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms

What is Karstbase?

Search KARSTBASE:

keyword
author

Browse Speleogenesis Issues:

KarstBase a bibliography database in karst and cave science.

Featured articles from Cave & Karst Science Journals
Chemistry and Karst, White, William B.
See all featured articles
Featured articles from other Geoscience Journals
Karst environment, Culver D.C.
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;
See all featured articles from other geoscience journals

Search in KarstBase

Your search for quercy (Keyword) returned 11 results for the whole karstbase:
Das Alter der Hhlen des Quercy., 1961, Cavaille, A(lbert).

Das Alter der Hhlen des Quercy, 1961, Cavaille, A.

Gologie et karstification quaternaire du Causse de Limogne, Quercy, Lot, 1985, Pelissie, Th.
THE NORTHERN HALF OF THE CAUSSE DE LIMOGNE (QUERCY, FRANCE): THE PART OF THE GEOLOGICAL CONDITIONS ON THE QUATERNARY KARSTIFICATION - The geological characteristics (lithology and structural framework) of the Northern half of the Causse de Limogne (Quercy) are briefly described and compared with the distribution of the quaternary karstic phenomena. From this comparison, a very clear dependence of the karstification to this various factors is proved. The practical consequences for the speleological prospections and explorations are briefly emphasized.

Prsentation du Causse Comtal (Aveyron), 1987, Solier, P.
THE " CAUSSE COMTAL " (AVEYRON, FRANCE): GEOLOGY, HYDROGEOLOGY AND INVENTORY OF MAIN CAVES - The " Causse Comtal " (S = 265 km2) forms a sedimentary bridge between the " Causses du Quercy " in the west and the " Grands Causses " in the east. With a middle humid climate (P = 1000 mm/y, T = 9,4 C, Evap. = 450-500 mm/y), this plateau karst presents two aquifer levels in the Lower and Middle Jurassic separated by a marly layer. These formations cover a paleozoic basement (sandstone, argillite from Carboniferous and Permian, crystalline rocks). The hydrogeological basins are controlled by E-W reverse faults due to the N-S pyrenean compression. The main spring is near Salles-la-Source in the western part (average discharge: 840 l/s; flood : 10 m3/s); it drains a 50-55 km2 area. The morphological and speleological evolution is subordinated to an erosion surface from Upper Cretaceous - Tertiary. Often stopped up (blocking), the numerous fossil caves probably date from the end of Cenozoic era. The large subterranean passages (active or semi-actives galleries; ex.: Tindoul de la Vayssire) are plio-quaternary.

Les pieges karstiques en Quercy; role et signification dans l'evolution des paysages, 1991, Simoncoincon R. , Astruc J. G. ,

Les travertins du Coly (Causse de Martel, Dordogne) : contribution de lendokarst ldification dun systme travertineux de valle, 1998, Hoffmann, Frdric
The "Doux de Coly" is a vauclusian spring with a 4-km-long phreatic gallery which regulates the carbonated minerlization of water. Because the CO2 pressure is too high inside the conduit, this artesian spring cannot deposit carbonates. The spring water connects with another river, the Chironde, and creates the Coly river. This mixing of waters induces chemical variations and allows travertine valley deposit by CO2 degassing and carbonate precipitation. A 2-year-long waterchemistry study reveals the influence of the "Doux de Coly" karstic system (phreatic zone) in the formation of travertines.

Le causse de Gramat et ses alentours : les atouts du paysage karstique, 2000, Salomon, Jeannol
The Gramat Causse and its surroun_dings offer an exceptional range of landscapes, which have long made the area renowned. Nevertheless, only a few natural sites (Padirac, Rocamadour, Pech Merle...) are currently shown to their advantage for and by the tourist indus_try. The aim of this paper is to show that, beyond these jewels, there exist many other natural sites for which it is worth making a detour. They simply have to be known and made known to others. In an area undergoing serious economic problems due to agricultural changes, "ecotourism" provides a promi_sing and attractive alternative as has been illustrated by the creation of the Quercy regional natural park. It is in this context that the development of the karst legacy should be given impetus and the water ressources, which are more and more valuable and another asset of the area, should be protected.

Mise en vidence du phnomne du renard : exemple des crues exceptionnelles des sources du Boulet-Blagour (Causse de Martel, Lot), 2001, Fabre Jeanpaul, Perrineau Alain
hydraulicians (dam construction) and ignored until now by hydrologists.

Morphologie et remplissage des dolines du Causse de Martel daprs les observations ralises au cours du diagnostic archologique de larodrome de Brive-Souillac (Corrze et Lot), 2006, Bruxelles Laurent, Colonge David, Salgues Thierry
Doline morphology and filling in the Causse of Martel based on the observations realized during the archaeological diagnosis of the Brive-Souillac airfield (Corrze and Lot, France) - An operation of archaeological diagnosis was led by the INRAP (national institute for preventive archaeological researches) on the Causse de Martel. On this occasion, 610 trenches with bulldozers were done, mainly localized in the bottom of dolines. The morphology of the depressions presents most often a pronounced asymmetry. We observe a gently dipping slope underlain by sandy alterites. On the opposite side, a steep corrosion rim developed in bathonian limestones. The sections show an accumulation of several meters of different sediments. At the base, we find periglacial deposits (stratified scree and yellow silt) which fossilized some archaeological remains of the middle Paleolithic. Just above an erosional unconformity, brown clays with calcareous gravel are found. Thanks to the presence of archaeological material, we date the emplacement of this level to be between the Protohistory and the medieval age. Finally, one or two meters of modern agricultural colluviums end the sequence. These observations put in evidence at least two main periods of infilling of these dolines. They correspond to two major phases of hillside imbalance. The first one has a climatic origin (Periglacial) and the second a human origin (clearings and agriculture). These accumulations are separated from the underlying deposits by distinct erosion surfaces, which can be linked to a reactivation of the karstic undercapture and the erosion of a part of the filling. This functioning corresponds to periods during which the colluviums are less abundant, indicating a certain stability of hillsides. Finally, the morphology of the rock layers and the geometry of the deposits show that the karstic landscape, which was clearly more accentuated before the Periglacial and even before Protohistory, underwent an important filling. Today, the dolines are partially filled and show with a flat bottom.

Early late Pliocene paleokarstic fillings predating the major Plio-Pleistocene erosion of the Quercy table, SW-France, 2007, Aguilar J. P. , Michaux J. , Pé, Lissié, T. , Sigé, B.

This evolution consists, first in the elaboration of the underground net systems, then in a long polyphased process of filling – emptying the karstic voids, according to the up and down base level changes that occurred almost continuously during the first half of the Tertiary era. The filling sediments are mostly vadose clay deposits, the various ages of which being established from the study of their fossil vertebrate contents (for latest accounts see Pélissié & Sigé 2006). Then, since latest Oligocene times, the Quercy platform was covered with prograding lacustrine sediments of the Aquitaine Basin. Finally, the whole structure was strongly worn down by the so- called Plio-Pleistocene erosional phase: the previously deep underground system became closer to the surface, and was exposed both to erosion and widening, but also Plio-Pleistocene fillings occurred as shown by the fossils they include (Crochet et al. 2006). Among the latter are rare Late Pliocene and Plio-Pleistocene tooth specimens.


Seismic study of the low-permeability volume in southern France karst systems, 2013, Galibert P. Y. , Valois R. , Mendes M. , Gurin R.

Locating groundwater in deep-seated karst aquifers is inherently difficult. With seismic methods, we studied the upper epikarst and the underneath low-permeability volume (LPV) of several karst systems located in the southern Quercy and Larzac regions of France and found that refraction tomography was effective only in the epikarst and not in the LPV. We evaluated a 3D case study using a combination of surface records and downhole receivers to overcome this limitation. This 3D approach unveiled a set of elongated furrows at the base of the epikarst and identified heterogeneities deep inside the LPV that may represent high-permeability preferred pathways for water inside the karst. To achieve the same result when no borehole was available, we studied seismic amplitudes of the wavefield, recognizing that wave-induced fluid flow in low-permeability carbonates is a driving mechanism of seismic attenuation. We developed a workflow describing the heterogeneity of the LPV with spectral attributes derived from surface-consistent decomposition principles, and we validated its effectiveness at benchmark locations. We applied this workflow to the 3D study and found a low-amplitude signal area at depth; we interpreted this anomaly as a water-saturated body perched above the aquifer.


Results 1 to 11 of 11
You probably didn't submit anything to search for