Skip to Main Content
Book Chapter

Modes of sediment delivery to the grounding line of a fast-flowing tidewater glacier: implications for ice-margin conditions and glacier dynamics

By
Ida Lønne
Ida Lønne
1
Villaveien 21, N-1440 Drøbak, Norway
Search for other works by this author on:
W. Nemec
W. Nemec
2
Department of Earth Science, University of Bergen, N-5007 Bergen, Norway
Search for other works by this author on:
Published:
January 01, 2011

Abstract

The study focuses on the terminal moraine of a fast-flowing, temperate tidewater glacier that protruded in Oslofjorden trough, southern Norway, during one of the re-advances of the receding Fennoscandian Ice Sheet in the Younger Dryas time. Allostratigraphic mapping is used to reconstruct the moraine's morphodynamic development, showing how information on the dynamics of ancient glaciers can be derived from their grounding-line deposits. The Storsand moraine commenced its development in the latest phases of ice-margin advance and continued to grow during the stillstand phase, as long as the ice flux persisted. The thick moraine (>100 m) formed in a few decades, to be rapidly abandoned and later emerged by regional uplift. The study concludes that: (a) both meltwater and ice flow invariably supply sediment to the grounding line, and it is the varied preservation potential of ice-derived diamicton that results in misleading differences between moraines; (b) the glacier-front kinematics is asymmetrical with slow advances and rapid retreats; (c) no moraines can form during glacier retreat; (d) the front of an outlet glacier may stabilize while the adjacent ice margin is oscillating or virtually retreating; and (e) marine moraines are an important source of information about ancient ice margins and glacier dynamics.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society Special Publication

Ice-Marginal and Periglacial Processes and Sediments

I. P. Martini
I. P. Martini
University of Guelph, Canada
Search for other works by this author on:
H. M. French
H. M. French
University of Guelph, Canada
Search for other works by this author on:
A. PéRez Alberti
A. PéRez Alberti
Universidade de Santiago de Compostela, Spain
Search for other works by this author on:
Geological Society of London
Volume
354
ISBN electronic:
9781862396029
Publication date:
January 01, 2011

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal