Ptygmatic structures: an analysis and review |
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Authors: | S Mitra J Datta |
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Institution: | (1) Present address: Department of Geological Sciences, Jadavpur University, Calcutta-32, India |
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Abstract: | Buckling of an isolated elastic-plastic layer embedded in a Newtonian viscous matrix has been studied and the generation of ptygmatic folding leading ultimately to clod and fragmentation at the crests as well as along the limbs has been discussed. The cause of formation of some of the uncommon ptygmatic structures has also been evaluated along with a review of the different postulates.
Zusammenfassung Im Experiment wird die Aufwölbung einer isolierten, elastisch-plastisch Lage in einer viscosen Newton'schen Matrix simuliert. Es entstehen hierbei ptygmatische Falten, die im Endstadium sowohl in den Scheiteln als auch auf den Flanken zerscheren und zerbrechen. Es kann dabei auch die Entstehung ungewöhnlicher ptygmatischer Strukturen studiert werden.
Résumé Le gondolement d'une couche de plastique élastique enrobée dans une matrice visqueuse newtonienne montre que la formation de plis ptygmatiques conduit finalement à des loupes et des cassures dans les charnières comme aussi le long des flancs. La cause de la formation de certaines structures ptygmatiques a été également considérée sur la base des différents postulats.
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