International workshop on Advances in Active Tectonics and Speleotectonics is being organized in Vienna in September 21 – 24, 2015
A reminder that 14th March is the deadline for submission of abstracts for the "Karst Groundwater at Birmingham" conference.
First publication of three volumes devoted to hypogenic caves in the region of Murcia - Spain.
The registration for the "Summer School on Speleothem Science" will be open from January 26th to April 3rd. The school will be held on 23-29 August 2015 in Oxford, UK, and is aimed at an international audience.
An announce of the 13th International Symposium on Pseudokarst to be held in the Czech Republic 16-19 September 2015
Did you know?
That argillaceous is the property of rocks containing clay in non-negligible proportions .?
Checkout all 2699 terms in the KarstBase Glossary of Karst and Cave Terms
Featured article from geoscience journal
A large number of uniform cone-shaped dissolution pipes has been observed and studied in Quaternary coastal calcareous arenites in Apulia and Sardinia (Italy) and Tunisia. These cylindrical tubes have a mean diameter of 52·8 cm and are up to 970 cm deep (mean depth for sediment-free pipes is 1·38 m). They generally have smooth walls along their length, are perfectly vertical and taper out towards their bottoms. Their development is not influenced by bedding nor fractures. Sometimes their walls are coated by a calcrete crust. Their morphology has been studied in detail and their relationships with the surrounding rocks and with the environment have been analysed. The perfectly vertical development is a clear evidence of their genesis controlled by gravity. The depth of the dissolution pipes can be described by an exponential distribution law (the Milanovic distribution), strongly suggesting they developed by a diffusion mechanism from the surface vertically downward. We believe dissolution pipes preferentially form in a covered karst setting. Local patches of soil and vegetation cause infiltration water to be enriched in carbon dioxide enhancing dissolution of carbonate cement and local small-scale subsidence. This process causes the formation of a depression cone that guides infiltrating waters towards these spots giving rise to the downward growth of gravity-controlled dissolution pipes. A change of climate from wetter phases to drier and hotter ones causes the formation of a calcrete lining, fossilizing the pipes. When the pipes become exposed to surface agents by erosion of the sediment cover or are laterally breached the loose quartz sand filling them may be transported elsewhere.