Tunnel valley deposits from the southern North Sea ˗ material provenance and depositional processes

Antonio Benvenuti, Branimir Segvic, Andrea Moscariello

Research output: Contribution to journalArticlepeer-review

Abstract

This study offers new insights into the origin and depositional history of the mix of sediments infilling of one of the largest offshore, northward oriented clinoforms-structured, tunnel valleys (TV) of Elsterian age in the southern North Sea (SNS). Early Pleistocene substrate and the TV infill have similar provenance signatures with elements from the Scandinavian and Baltic realms as well as from Renish central Europe and the Alps. The compositional and geo- and thermo-chronological investigations of this study shed more light on the provenance of TV deposits. K-Ar dating of illite, QEMSCAN® heavy mineral assemblage study, and U-Pb and fission track dating on apatite single grains were the analyses used. Already before the Elsterian glaciation, fluvial transport to the SNS had altered with Baltic sources diminishing and central European increasing. The episode of subglacial tunnel valley formation, with its much deeper reaching local erosion and reworking, apparently interrupted that
Original languageEnglish
Pages (from-to)625-642
JournalBoreas
DOIs
StatePublished - Mar 2018

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