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First insights into the age of the giant ice deposits in the Eisriesenwelt cave (Austria).
Sci Rep
May 2024
Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710054, China.
Frozen water is the most widespread type of ice present in ice caves and forms ice stalagmites and stalactites as well as floor ice, which is often several meters thick. Organic macroremains are commonly rare in this type of cave ice, which makes it difficult to establish a chronology and severely limits the use of such ice deposits as paleoenvironmental archives. Here, the chronology of such ice deposits in the inner part of the glaciated Eisriesenwelt, one of the world's largest ice caves located in the European Alps of Austria, is determined by a combination of radiocarbon and Th dating of cryogenic calcite.
View Article and Find Full Text PDFVirtual excavation and analysis of the early Neanderthal cranium from Altamura (Italy).
Commun Biol
March 2023
Department of Environmental Biology, Sapienza University of Rome, Rome, 00185, Italy.
Complete Neanderthal skeletons are almost unique findings. A very well-preserved specimen of this kind was discovered in 1993 in the deepest recesses of a karstic system near the town of Altamura in Southern Italy. We present here a detailed description of the cranium, after we virtually extracted it from the surrounding stalagmites and stalactites.
View Article and Find Full Text PDFStalactites and Stalagmites in the Stomach after Endoscopic Sleeve Gastroplasty.
J Gastrointestin Liver Dis
September 2022
Digestive Endoscopy Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome; Centre for Endoscopic Research Therapeutics and Training (CERTT), Università Cattolica del Sacro Cuore, Rome, Italy.
<b>Background and Objective:</b> Ureolytic bacteria are bacteria capable of hydrolyzing urea. In construction, these bacteria are known to help improve soil stability. One of the habitats of ureolytic bacteria is cave ornaments such as gourdam, flowstone, stalagmite and stalactite.
View Article and Find Full Text PDFSulfate and Molybdate Incorporation at the Calcite-Water Interface: Insights from Ab Initio Molecular Dynamics.
ACS Earth Space Chem
August 2021
Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6DX, U.K.
Sulfur and molybdenum trace impurities in speleothems (stalagmites and stalactites) can provide long and continuous records of volcanic activity, which are important for past climatic and environmental reconstructions. However, the chemistry governing the incorporation of the trace element-bearing species into the calcium carbonate phases forming speleothems is not well understood. Our previous work has shown that substitution of tetrahedral oxyanions [O] ( = S and Mo) replacing [CO] in CaCO bulk phases (except perhaps for vaterite) is thermodynamically unfavorable with respect to the formation of competing phases, due to the larger size and different shape of the [O] tetrahedral anions in comparison with the flat [CO] anions, which implied that most of the incorporation would happen at the surface rather than at the bulk of the mineral.
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