01front.pdf (453.6 kB)
Download file

Landscape development and vegetation of the Vestfold Hills, East Antarctica

Download (453.6 kB)
thesis
posted on 28.03.2022, 01:33 authored by John Pickard
The Vestfold Hills (68°35'S 78°00'E) are a 400 km² ice-free oasis on the coast of East Antarctica. Low hills of Archaean gneisses are draped with Holocene till. The area is bounded in the east by the ice sheet and in the south by the Sørsdal Glacier. Present geomorphic processes are variable across the Hills from the coast to the ice sheet. Active melt processes have been measured on the ice margins and on an ice-cored moraine. Rivers flowing through the Hills carry meltwater from the ice sheet and glacier via a series of lakes to the sea. The Druzhby River system is one of the largest externally-draining systems in Antarctica. Pingos occur on the ice-cored moraine, the only-known site in the Southern Hemisphere. Freeze/thaw activity is high across the Hills, but periglacial landforms are not uniformly distributed. -- Vegetation is sparse overall but most abundant in a zone a few kilometres from the ice sheet, due to the interaction of windblown salt, water, and nutrient availability. The HIlls belong to the Coastal Zone of the Continental Antarctic Region. Within a single moss bed, chance is important in determining distribution. Mosses are among the oldest Holocene fossils in the Hills. Problems with moss taxonomy severely retard ecological and physiological research. -- Tertiary marine sediments mark the location of a Late Miocene coast remarkably close to the present coastline, during an interglacial period with climate similar to the present. The terminal Pleistocene expansion of the ice sheet (Vestfold Glaciation) swamped the Hills under > 1000 m of ice. Holocene ice retreat has exposed the Hills. Retreat is documented and radiocarbon-dated by abundant marine fossils above hypersaline lakes. -- Marine inlets isolated by isostatic uplift became chains of lakes with complex Holocene histories, All Holocene marine fossils are extant species with wide ecological tolerances. Holocene climates in the Hills were little different from present. Fossil mosses and stromatolites indicate unusual lakes which have changed from marine to fresh and vice versa. -- Low altitude makes the Hills an excellent site for the preservation of evidence hearing on the Holocene collapse of the antarctic ice sheet.

History

Table of Contents

Introduction -- Present geomorphological processes -- Vegetation -- History of the Hills -- Discussion -- Appendix.

Notes

and School of Biological Sciences and Quaternary Research Unit, Macquarie University. Antarctic Division "22 November 1984". Thesis by publication. At foot of title: Australia's Antarctic Program Includes errata sheet and 1 col. map entitled Australian Antarctic Territory: Vestfold Hills (Princess Elizabeth Land). Includes bibliographies

Awarding Institution

Macquarie University

Degree Type

Thesis PhD

Degree

Thesis (PhD), Macquarie University, School of Biological Sciences

Department, Centre or School

School of Biological Sciences

Year of Award

1985

Principal Supervisor

D. A. Adamson

Rights

Copyright disclaimer: http://www.copyright.mq.edu.au Copyright John Pickard 1984. Complete version suppressed due to copyright restrictions. However, on receipt of a Document Supply Request, placed with Macquarie University Library by another library, we will consider supplying a copy of this thesis. For more information on Macquarie University's Document Supply, please contact lib.interlib@mq.edu.au

Language

English

Jurisdiction

Antarctic Ocean; Antarctica

Extent

443 p. ill., maps

Former Identifiers

mq:17793 http://hdl.handle.net/1959.14/158016 1483894