Plastic and ruptural deformations in basin sediments
DOI:
https://doi.org/10.26485/BP/1973/22/21Keywords:
syngenetic deformations, diagenetic deformations, Pleistocene, Western SiberiaAbstract
Primary sedimentation structures in Pleistocene marine and lacustrine deposits of northern Western Siberia and the Pechora Lowland exhibit frequent deformation features that are unrelated to glacial activity or permafrost processes. These are both plastic and ruptural deformations of syngenetic and diagenetic character. Their external morphology often leads to potential misinterpretation as cryogenic. The study highlights the role of properties of fine-grained sediments, water saturation and overburden pressure in the formation of such structures. The absence of sedimentation gaps and glacial indicators supports a non-glacial genesis.
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