LATE WISCONSINAN ICE RETREAT FROM THE SCOTIAN SHELF

Authors
Citation
Lh. King, LATE WISCONSINAN ICE RETREAT FROM THE SCOTIAN SHELF, Geological Society of America bulletin, 108(8), 1996, pp. 1056-1067
Citations number
57
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary
ISSN journal
0016-7606
Volume
108
Issue
8
Year of publication
1996
Pages
1056 - 1067
Database
ISI
SICI code
0016-7606(1996)108:8<1056:LWIRFT>2.0.ZU;2-5
Abstract
The late middle to late Wisconsin Laurentide ice sheet terminated at t he edge of the Scotian Shelf ca, 21 ka, in close temporal agreement wi th the H-2 Heinrich event of the North Atlantic stratigraphy. The ice began its recession along the western edge of the shelf prior to 20 ka . By 15 ka, the ice front had retreated in a northeastward direction, exposing much of the western half of the shelf, although ice appears t o have remained on the inner shelf north of a morainal system for anot her 2 k.y. The retreat was probably controlled by an ice divide along the axis of the mainland until after 16 ka, at which time an ice-flow pattern began to emanate from local remnant ice centers on the mainlan d. Late Wisconsinan ice seems to have remained an much of the eastern portion of the shelf as late as 12-14.5 ka, and probably deposited sev eral outer bank moraines. Younger Dryas ice probably was present at is olated land and coastal areas for a short period ca, 10.5 ka, but its offshore influence appears to have been restricted to floating ice and storm-related events.