Title
Glacial geology of Saalian relief around Midwolda, eastern Groningen, the Netherlands
Author
Kluiving, S.J.
Aalbersberg, G.
van Balen, R.T.
Kasse, C.
Publication year
2018
Abstract
Due to canal-digging activities in 2011 and 2014, two small and one large temporary exposure, all ranging from 4 to 5 m in depth, were studied with respect to the sedimentology and structural geology, in the glacial ridge of Midwolda, Groningen, the Netherlands. The lowermost unit consists of clay of Elsterian age and is composed of glaciolacustrine and turbiditic deposits (Peelo Formation). These show synsedimentary deformations due to loading, as well as post-sedimentary Saalian glaciotectonic deformations, consisting of folding, and faulting structures. The overlying Saalian till sequence consists of two main units. The lower unit, with clear features of a subglacial deformation zone (e.g. lateral heterogeneity), has a local origin and strongly resembles the underlying Elsterian clay. Glacial tectonic and morphological observations indicate a primary NE-SW ice-flow direction. The second till layer has a sandy texture and high crystalline gravel content, while glacial-tectonic indicators point to a NW-SE ice-flow direction. The deformation of the till layers has caused a repetition and mixing of till layers, due to the last ice movement. The NW-SE ice movement is supported by the morphology as well as data from erratic gravel counts. Correlation with geological cross-sections strongly suggests regional subsurface control on ice-sheet behaviour. Copyright © Netherlands Journal of Geosciences Foundation 2018.
Subject
2015 Energy
Geological Survey Netherlands
Geosciences
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http://resolver.tudelft.nl/uuid:a7f31b0e-a18b-46f9-9ce9-d7d03651ff88
DOI
https://doi.org/10.1017/njg.2018.16/
TNO identifier
861664
ISSN
0016-7746
Source
Geologie en Mijnbouw/Netherlands Journal of Geosciences, 97 (97), 261-282
Document type
article