A Delta Built by Ice Rafting in Outflow from a Glacial Lake
作者:
GilbertRobert,
DeslogesJoseph R.,
期刊:
Geografiska Annaler: Series A, Physical Geography
(Taylor Available online 1987)
卷期:
Volume 69,
issue 3-4
页码: 375-378
ISSN:0435-3676
年代: 1987
DOI:10.1080/04353676.1987.11880225
出版商: Taylor&Francis
数据来源: Taylor
摘要:
ABSTRACTA delta-shaped deposit 37 m wide, 50 m long and 6 m high is described. It has formed from sediment rafted to the outlet of ice-dammed Ape Lake, British Columbia by ice bergs calved from the damming glacier. They drift the length of the lake where they become grounded and trapped in outflowing waters. Sediment in the bergs is released as they melt and accumulates at an estimated rate of 1.5 m3/annum. The resulting form is composed of poorly stratified diamiction capped by an armoured, gravel surface. Except in the armour, gravel sized particles are angular and have striated surfaces. If these deltas are recognised in ancient glaciolacustrine environments, they would provide edvidence of the presence of calving glaciers and the significance of ice rafting.
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