Open AccessControls on sedimentation in a late Devensian ice‐dammed lake, Achnasheen, Scotland
Author(s) -
BENN DOUGLAS I.
Publication year - 1989
Publication title -
boreas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.95
H-Index - 74
eISSN - 1502-3885
pISSN - 0300-9483
DOI - 10.1111/j.1502-3885.1989.tb00368.x
Subject(s) - geology , meltwater , glacier , landform , geomorphology , sedimentation , sediment , ice stream , shelf ice , physical geography , oceanography , cryosphere , sea ice , geography
Two distinct glacigenic sediment‐landform associations are described from the site of a former ice‐dammed lake at Achnasheen, Ross‐shire, Scotland. Firstly, three cross‐valley ridges, principally composed of rain‐out and sediment gravity flow deposits, were associated with a damming lobe of ice which directly controlled lake level. Secondly, large coalescing meltwater‐fed deltas were developed in front of two outlet glaciers which initially terminated in the western end of the lake. The divergent evolution of the two associations is explained with reference to differing relationships between ice thickness and lake level, flux of meltwater, and glacier activity.