Premium
Glaciomarine deltaic deposition and ice‐marginal tectonics: The ‘Loch Don Sand Moraine’, Isle of Mull, Scotland
Author(s) -
Benn Douglas I.,
Evans David J. A.
Publication year - 1993
Publication title -
journal of quaternary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.142
H-Index - 94
eISSN - 1099-1417
pISSN - 0267-8179
DOI - 10.1002/jqs.3390080402
Subject(s) - moraine , geology , deglaciation , glacier , geomorphology , landform , glacial period , deposition (geology) , sedimentary depositional environment , sediment , geochemistry , structural basin
Detailed descriptions are given of sediments exposed in the ‘Loch Don Sand Moraine’, Isle of Mull, Scotland. Two distinct sediment‐landform associations occur within the ‘moraine’: (i) a Gilbert‐type glaciomarine delta complex graded to ca. 34 m Ordnance Datum; and (ii) thrust moraines consisting of deformed sands and silts. Whereas previous studies have attributed the ‘moraine’ to a single glacial readvance, this paper shows that the delta and the thrust moraines formed during ice‐sheet deglaciation and the Loch Lomond Readvance, respectively. Depositional conditions and the palaeoenvironment for each stage of ‘moraine’ formation are reconstructed. During the Loch Lomond Readvance, till deposition and thrust moraine formation appear to have been controlled by drainage conditions in the marginal zone of the glacier.