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Formation of a pronival rampart on sub-Antarctic Marion Island

Published online by Cambridge University Press:  02 August 2007

David W. Hedding ,
Paul D. Sumner ,
Stephen D. Holness  and
K. Ian Meiklejohn
David W. Hedding*
Affiliation:
Department of Geography and Environmental Sciences, North West University, Mafeking 2735, South Africa
Paul D. Sumner
Affiliation:
Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria 0002, South Africa
Stephen D. Holness
Affiliation:
South African National Parks Board, Port Elizabeth 6013, South Africa
K. Ian Meiklejohn
Affiliation:
Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria 0002, South Africa
*
*[email protected]
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Abstract

The formation of a pronival (protalus) rampart on sub-Antarctic Marion Island is investigated. Morphological attributes show debris at the angle of repose on the rampart's proximal slope and at a lower angle on the distal slope. Relative-age dating, based on the percentage moss cover and weathering rind thickness of the clastic component, indicates accumulation mainly on the proximal slope and rampart crest, implying upslope (retrogressive) accumulation. This contrasts with a previously published model for pronival ramparts, which proposes rampart growth by addition of material to the distal slope. Development of the Marion Island rampart is suggested to result from the control exerted by a relatively low-angled surface and a shrinking snowbed. A small debris step formed on the proximal slope appears to be a response to decreased snowfalls due to changing climate over the last c. 50 years. Growth rate of the rampart is considered to be variable during the Holocene in response to changes in climate and debris supply.

Keywords

climate changeprotalusretrogressivesnowbedsupranival
Type
EARTH SCIENCES
Information
Antarctic Science , Volume 19 , Issue 4 , December 2007 , pp. 443 - 450
Copyright
Copyright © Antarctic Science Ltd 2007

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References

Ballantyne, C.K. 1987a. Winter-talus, nivation ridges, and pro-talus ramparts. Journal of Glaciology, 33, 246–247.CrossRefGoogle Scholar
Ballantyne, C.K. 1987b. Some observations on the morphology and sedimentology of two active protalus ramparts, Lyngen, northern Norway. Arctic and Alpine Research, 19, 167–174.CrossRefGoogle Scholar
Ballantyne, C.K. & Kirkbride, M.P. 1986. The characteristics and significance of some late glacial protalus ramparts in upland Britain. Earth Surface Processes and Landforms, 11, 659–671.CrossRefGoogle Scholar
Birnie, R.V. & Thom, G. 1982. Preliminary observations on two rock glaciers in South Georgia, Falkland Islands Dependencies. Journal of Glaciology, 28, 377–386.CrossRefGoogle Scholar
Boelhouwers, J. & Hall, K. 2002. Periglacial and permafrost research in the southern hemisphere. South African Journal of Science, 98, 46.Google Scholar
Boelhouwers, J.C., Jager, D.F. & De Joode, A. 1999. Application of relative-age dating methods to openwork debris flow deposits in the Cederberg mountains. South African Geographical Journal, 81, 135–142.CrossRefGoogle Scholar
Boelhouwers, J.C., Holness, S.D. & Sumner, P.D. 2000. Geomorphological characteristics of small debris flows on Junior's Kop, Marion Island, maritime sub-Antarctic. Earth Surface Processes and Landforms, 25, 341–352.3.0.CO;2-D>CrossRefGoogle Scholar
Boelhouwers, J.C., Holness, S.D. & Sumner, P.D. 2003. The maritime subantarctic: a distinct periglacial environment. Geomorphology, 52, 39–55.CrossRefGoogle Scholar
Curry, A.M., Walden, J. & Cheshire, A. 2001. The Nant Ffrancon ‘protalus rampart’: evidence for Late Pleistocene paraglacial landsliding in Snowdonia, Wales. Proceedings of the Geologists' Association, 112, 317–330.CrossRefGoogle Scholar
Grab, S.W. 1996. The occurrence of a Holocene rock glacier on mount Kenya: some observations and comments. Permafrost and Periglacial Processes, 7, 381–389.3.0.CO;2-5>CrossRefGoogle Scholar
Hall, K.J. 1978. Quaternary glacial geology of Marion Island. PhD thesis, University of the Orange Free State, Bloemfontein, 269 pp. [Unpublished].Google Scholar
Hall, K.J. 1980. Late Glacial ice cover and palaeotemperatures on sub-Antarctic Marion Island. Palaeogeography Palaeoclimatology Palaeoecology, 29, 243–259.CrossRefGoogle Scholar
Hall, K.J. 2002. Review of present and Quaternary periglacial processes and landforms of the maritime and sub-Antarctic region. South African Journal of Science, 98, 71–81.Google Scholar
Hall, K.J. & Meiklejohn, K.I. 1997. Some observations regarding protalus ramparts. Permafrost and Periglacial Processes, 8, 245–249.3.0.CO;2-R>CrossRefGoogle Scholar
Harris, C. 1986. Some observations concerning the morphology and sedimentology of a protalus rampart, Okstindan, Norway. Earth Surface Processes and Landforms, 11, 673–676.CrossRefGoogle Scholar
Hedding, D.W. 2006. Geomorphology and geomorphological responses to climate change in the interior of sub-Antarctic Marion Island. MSc thesis, University of Pretoria, South Africa, 113 pp. [Unpublished].Google Scholar
Holness, S.D. 2001. Periglacial slope processes, landforms and environment at Marion Island, maritime subantarctic. PhD thesis, University of the Western Cape, Bellville, South Africa, 551 pp. [Unpublished].Google Scholar
Holness, S.D. & Boelhouwers, J. 1998. Some observations on Holocene changes in periglacial activity at Long Ridge, Marion Island. South African Journal of Science, 94, 399–403.Google Scholar
McCarroll, D. 1989. Schmidt Hammer relative-age evaluation of a possible pre-“Little Ice Age” Neoglacial moraine, Leirbreen, southern Norway. Norsk Geologisk Tidsskrift, 69, 125–130.Google Scholar
McDougall, I., Verwoerd, W. & Chevallier, L. 2001. K–Ar geochronology of Marion Island, Southern Ocean. Geological Magazine, 138, 1–17.CrossRefGoogle Scholar
Ono, Y. & Watanabe, T. 1986. A protalus rampart related to alpine debris flows in the Kuranosuke Cirque, northern Japanese Alps. Geografiska Annaler, 86A, 213–223.CrossRefGoogle Scholar
Pérez, F.L. 1988. Debris transport over snow surfaces: a field experiment. Revue de Géomorphologie Dynamique, 37, 81–101.Google Scholar
Sancho, L.G., Palacios, D., De Marcos, J. & Valladares, F. 2001. Geomorphological significance of lichen colonization in a present snow hollow: Hoya del Cuchillar de las Navajas, Sierra de Gredos (Spain). Catena, 43, 323–340.CrossRefGoogle Scholar
Schulze, B.R. 1971. The climate of Marion Island. In Van Zinderen Bakker, E.M., Winterbottom, J.M. & Dyer, R.A., eds. Marion and Prince Edward Islands. Cape Town: Balkema, 16–31.Google Scholar
Shakesby, R.A. 1997. Pronival (protalus) ramparts: a review of forms, processes, diagnostic criteria and palaeoenvironmental implications. Progress in Physical Geography, 21, 394–418.CrossRefGoogle Scholar
Shakesby, R.A., Matthews, J.A. & McCarroll, D. 1995. Pronival (‘protalus’) ramparts in the Romsdalsalpane, southern Norway: forms, terms, subnival processes, and alternative mechanisms of formation. Arctic and Alpine Research, 27, 271–282.CrossRefGoogle Scholar
Shakesby, R.A., Matthews, J.A., McEwan, L.J. & Berrisford, M.S. 1999. Snow-push processes in pronival (protalus) rampart formation: geomorphological evidence from Smørbotn, Romsdalsalpane, Southern Norway. Geografiska Annaler, 81A, 31–45.CrossRefGoogle Scholar
Smith, V. 2002. Climate change in the sub-Antarctic: an illustration from Marion Island. Climate Change, 52, 345–357.CrossRefGoogle Scholar
Sumner, P., Nel, W., Holness, S.D. & Boelhouwers, J.C. 2002. Rock weathering characteristics as relative-age dating indicators for glacial and post-glacial landforms on Marion Island. South African Geographical Journal, 84, 153–157.CrossRefGoogle Scholar
Sumner, P.D., Meiklejohn, K.I., Boelhouwers, J.C. & Hedding, D.W. 2004. Climate change melts Marion Island snow and ice. South African Journal of Science, 100, 395–398.Google Scholar
Thorn, C.E. 1992. “Periglacial geomorphology: what, where, when?” In Dixon, J.C. & Abrahams, A.D., eds. Periglacial geomorphology. London: Wiley, 1–30.Google Scholar
Verwoerd, W.J. 1971. Geology. In Van Zinderen Bakker, E.M., Winterbottom, J.M. & Dyer, R.A., eds. Marion and Prince Edward Islands. Cape Town: Balkema, 40–61.Google Scholar