Varve dating definition
Mots clés : varvé sensible, argile cimentée, réactions en pression interstitielle, cisaillement non drainé, dissipation de la pression interstitielle, comportement élastique anisotrope, conditions d'état critique.The results are reported of a laboratory testing program to determine the permeability ratio, r K, (ratio of coefficients of permeability for flow parallel to and perpendicular to the soil layers) of samples of New Liskeard varved soil.This forms a pair of layers—one coarse and one fine—for each annual cycle. The translations of varve from English to other languages presented in this section have been obtained through automatic statistical translation; where the essential translation unit is the word «varve» in English. More recently introduced terms such as 'annually laminated' are synonymous with varve.Of the many rhythmites found in the geological record, varves are one of the most important and illuminating to studies of past climate change.The term first appeared as Hvarfig lera on the first map produced by the Geological Survey of Sweden in 1862.
Sources and influences of possible errors in varve chronologies are best determined and constrained by repeated varve counts, and by including radioisotopes and correlation with historically documented events.Varved sediment sequences which span the LGIT have been investigated in a number of sites in continental Europe, Scandinavia and Greenland, where they can be used for dating purposes (varve chronology).Although records of varved sediments have been reported from sites in Britain, and a few examined quite closely, very feww robust varve chronologies have ever been developed for the period 16 to 8 ka BP.En utilisant un ensemble d’entraînement constitué des dix varves les plus épaisses dans la colonne stratigraphique de 38 ans, un modèle heuristique a été développé pour relier les structures infra-annuelles et les conditions météorologiques régionales.Late Pleistocene Lake Deschaillons varves from the central St.