AUDRA , Philippe

International audience

International audience

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Numerous traces of bear visits have been found in caves. They generally correspond to claw marks on walls or to cave bear wallows. Sometimes, these clues are not always well preserved and do not allow the confident identification of the presence of bears. The differential preservation of clue on limestone walls can hamper speleologists and...

The Camou springs (Arbailles Massif, French Western Pyrenees) display an unusual close association of a typically cold karstic spring that drains the Urgonian western limb of the Arbailles, and a thermo-mineral spring (33.5°C; salinity 17.7 g/L). The latter gains its mineralization while crossing the Triassic evaporites mainly through a deep...

We present the French Association of Karstology through an overview of its organization, its administrative life, and its activities. These are essentially the editorial activity (Karstologia, co-published with the French Federation of Speleology), the organization of annual field meetings, and sometimes symposia. After forty years, 43 field...

The Prehistoric Cave at Azé (France) was divided in two parts by calcite flowstone. This isolated the innermost parts of the cave from the entrance, which remained connected to the surface. Since the closure, bats have not been able to access the cave beyond the flowstone blockage. They have been present only in the cave entrance. The...

National audience

Several sinkhole collapses were occurred in the many sites in urban areas and/or their rural periphery; in NE Algeria, in the last few years. The abrupt collapse causes damages to properties, infra-structures, and even lives. The most spectacular oneoccurred in February 2009 inside the Cheria city, Northwest of Tebessa department, with a...

This review explores the potential for establishing valley incision chronologies from alluviumfilled cave systems, and covers a total of 30 case studies since 1997. Caves in limestone develop very fast (~10^4 years) when conditions for bedrock solution are optimal, and many contain alluvium deposited by allogenic sinking streams, preserving the...

Val di Scerscen is located in the Central Italian Alps (Northern Lombardy), in the scenic setting of Valmalenco. This area is not very rich in caves, especially due to the abundant presence of oceanic metamorphic rocks, which where uplifted during the Alpine orogenesis, dominate the terrains. A thin lens of whitish dolomitic marbles belonging...

The little known impact of bats and bat guano in the late stages of cave morphogenesis. Bats are considered as symbolic caves inhabitants. The colonies, sometimes huge, may occupy caves through long periods. Large guano deposits were accumulated. Some have been mined for phosphates, either by hand or at the industrial scale. Bats impact is...

The condensation-corrosion process occurs when airflow cools at the contact with colder cave walls. Condensed water becomes aggressive for soluble rocks and corrodes the walls. This process is particularly active close to cave entrances in high thermal gradient zones where external air enters caves. Condensation appears to be important where...

Hypogenic caves, linked to carbonate rock dissolution due to CO 2-and H 2 S-rich ascending deep waters, represent more than 10% of karstic networks worldwide; a proportion that increases as these systems are better constrained. However, interaction between hypogenic and epigenic processes is still poorly understood, especially since the...

The decay of bat guano deposits in caves produces mineral accumulations, mainly phosphates and secondary sulfates. Chameau Cave, Eastern Morocco, is located in the semi-arid Bni Snassen Mountains. It is composed of semi-active and dry passages, and is featured by strong condensation-corrosion on the walls, presence of fluvial sediments, and old...

Deeply incised river networks are generally regarded as robust features that are not easily modified by erosion or tectonics. Although the reorganization of deeply incised drainage systems has been documented, the corresponding importance with regard to the overall landscape evolution of mountain ranges and the factors that permit such...

Many caves in Sicily have been shown to have a sulfuric acid or other hypogenic origin. We studied three caves (Palombara, Scrivilleri, Monello) near Syracuse (eastern Sicily), in an area that was strongly uplioed and faulted, creaKng mulKple Pleistocene marine terraces. Mineralogy, stable isotopes and daKng methods (paleomagneKsm, U/Th) were...

Many caves in Sicily have been shown to have a sulfuric acid or other hypogenic origin. We studied three caves (Palombara, Scrivilleri, Monello) near Syracuse (eastern Sicily), in an area that was strongly uplioed and faulted, creaKng mulKple Pleistocene marine terraces. Mineralogy, stable isotopes and daKng methods (paleomagneKsm, U/Th) were...