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Sedimentology of the Permian Radok Conglomerate in the Beaver Lake area of MacRobertson Land, East Antarctica

Published online by Cambridge University Press:  01 May 2009

C. R. Fielding  and
J. A. Webb
C. R. Fielding
Affiliation:
Department of Earth Sciences, University of Queensland, Queensland 4072, Australia
J. A. Webb
Affiliation:
Department of Geology, LaTrobe University, Bundoora, Victoria 3083, Australia
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Abstract

The mid- to Upper Permian Radok Conglomerate, the lowermost formation of the Permo-Triassic Amery Group, crops out in the Beaver Lake area of the northern Prince Charles Mountains, East Antarctica. Outcrop is confined to a north-south elongate, fault-bounded corridor interpretedas a remnant of a continental extensional basin formed during Late Palaeozoic times. This basinforms a small part of the much larger Lambert Graben, a major continental rift system. The RadokConglomerate consists of interbedded conglomerates, argillaceous sandstones, siltstones, and minor, thin carbonaceous siltstones and coals. Textural, petrographic, palaeocurrent and other data suggestlocal derivation from Precambrian massifs to the immediate west, during a period of fault activity.The unit is a minimum of 400 m thick, the base being unexposed, and grossly fines upward. It isabruptly overlain by quartzo-feldspathic sandstone-dominated rocks of the Upper Permian Bainmedart Coal Measures. Seven recurrent lithofacies have been recognized with the Radok Conglomerate, and are interpreted as the products of poorly-confined stream flow, sheet flow and sediment gravity flow processes, suspension fallout in shallow standing water, and organic sediment accumulation in peat-forming wetlands. The unit as a whole is interpreted as having accumulated as a coarse alluvial apron along the western margin of a ?graben extensional trough. Similar, though poorly exposed, facies are exposed on the eastern margin of the basin and may reflect similar depositional systems. Towards the top of the Radok Conglomerate, typical Radok lithologies are interbedded with quartzo-feldspathic sandstones derived from the south, precursors of the overlying Bainmedart Coal Measures. Interference between transverse (Radok) and axial (Bainmedart) drainage is possibly related to progressive infilling of extensional topography, thereby allowing axially flowing rivers to avulse increasingly into the Beaver Lake region from the main Lambert Graben.

Type
Articles
Information
Geological Magazine , Volume 132 , Issue 1 , January 1995 , pp. 51 - 63
Copyright
Copyright © Cambridge University Press 1995

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References

Besly, B. M., & Fielding, C. R., 1989. Palaeosols in Westphalian coal-bearing and red-bed sequences, central and northern England. Palaeogeography, Palaeoclimatology, Palaeoecology 70, 303–30.CrossRefGoogle Scholar
Crohn, P. W., 1959. A contribution to the geology and gtaciology of the western part of Australian Antarctic Territory. Bulletin of the Bureau of Mineral Resources, Geology and Geophysics, Australia no. 52, 103 pp.Google Scholar
Dibner, A. F., 1978. Palynocomplexes and age of the Amery Formation deposits, East Antarctica. Pollen et Spores 20, 405–22.Google Scholar
Fedorov, L. V., Grikurov, G. E., Kurinin, R. G., & Masolov, V. N., 1982. Crustal structure of the Lambert Glacier area from geophysical data. In Antarctic Geoscience (ed. Craddock, C.), pp. 931–6. Madison: University of Wisconsin Press.Google Scholar
Folk, R. L., 1974. Petrology of Sedimentary Rocks. Austin: Hemphill.Google Scholar
Grew, E. S., 1985. Field studies on the Jetty Peninsula (Amery Ice Shelf area) with the 30th Soviet Antarctic Expedition. Antarctic Journal of the United States 20, 52–3.Google Scholar
Hofmann, J., 1991. Bruchtektonik und Magmatismus im gebiet der Jetty-Oase, MacRobertson Land (Ostantarktika). Freiberger Forschungshefte no. C 438, Geowissenschaften-Geologie, 38 pp.Google Scholar
Kamenev, E., Andronikov, A. V., Mikhalsky, E. V., Krasnikov, N. N., & Stuwe, K., 1993. Soviet geological maps of the Prince Charles Mountains, East Antarctic Shield. Australian Journal of Earth Sciences 40, 501–17.CrossRefGoogle Scholar
Kemp, E. M., 1973. Permian flora from the Beaver Lake area, Prince Charles Mountains, Antarctica 1. Palynological examination of samples. Bulletin of the Bureau of Mineral Resources, Geology and Geophysics, Australia 126, 7–12.Google Scholar
Leeder, M. R., & Jackson, J. A., 1993. The interaction between normal faulting and drainage in active extensional basins, with examples from the western United States and central Greece. Basin Research 5, 79–102.CrossRefGoogle Scholar
Lowe, D. R., 1976. Grain flow and grain flow deposits. Journal of Sedimentary Petrology 46, 188–99.Google Scholar
Mastalerz, K., & Wojewoda, J.,1993. Alluvial-fan sedimentation along an active strike-slip fault: Plio-Pleistocene Pre-Kaczawa fan, SW Poland. In Alluvial Sedimentation (eds Marzo, M. and Puigdefabregas, C.), pp. 293–304. International Association of Sedimentologists Special Publication no. 17. Oxford: Blackwell.CrossRefGoogle Scholar
Mckelvey, B. C., & Stephenson, N. C. N., 1990. A geological reconnaissance of the Radok Lake area, Amery Oasis, Prince Charles Mountains. Antarctic Science 2, 53–66.CrossRefGoogle Scholar
Mond, A., 1972. Permian sediments of the Beaver Lake area, Prince Charles Mountains. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 585–9. Oslo: Universitetsforlaget.Google Scholar
Nemec, W., & Steel, R. J., 1984. Alluvial and coastal conglomerates: their significant features and some comments on gravelly mass-flow deposits. In Sedimentology of gravels and conglomerates (eds Koster, E. H. and Steel, R. J.), pp. 1–31. Canadian Society of Petroleum Geologists Memoir no. 10. Calgary: CSPG.Google Scholar
Playford, G., 1990. Proterozoic and Palaeozoic palynology of Antarctica: a review. In Antarctic Paleobiology — its Role in the Reconstruction of Gondwana (eds Taylor, T. N. and Taylor, E. L.), pp. 50–70. New York: Springer-Verlag.Google Scholar
Ravich, G. M., Gor, Yo. G., Dibner, A. F., & Dobanova, O. V., 1977. Stratigrafiya verkhnepaleozoiskikh uglenocnykh otlozheiny vostochnoy Antarktidy (rayon ozera Biver). Antarktika 16, 62–75.Google Scholar
Ruker, R. A., 1963. Geological reconnaissance in Enderby Land and the southern Prince Charles Mountains, Antarctica. Bureau of Mineral Resources, Geology and Geophysics, Australia, Record no. 1963/154.Google Scholar
Stagg, H. M. J., 1985. The structure and origin of Prydz Bay and MacRobertson Shelf, East Antarctica. Tectonophysics 114, 315–40.CrossRefGoogle Scholar
Stephenson, N. C. N., & Cook, N. D. J., 1990. Metamorphic and structural evolution of he Precambrian basement in the northern Prince Charles Mountains. In Report on the 1989–90 Prince Charles Mountains Program, vol.1, pp. 11–13. Hobart: Australian National Antarctic Research Expeditions.Google Scholar
Tiercelin, J. J., 1990. Rift-basin sedimentation: responses to climate, tectonism and volcanism. Examples of the East African Rift. Journal of African Earth Sciences 10, 283–305.CrossRefGoogle Scholar
Tingey, R. J., 1991. The regional geology of Archaean and Proterozoic rocks in Antarctica. In The Geology of Antarctica (ed. Tingey, R. J.), pp. 1–73. Oxford Monograph on Geology and Geophysics no. 17. Oxford: Clarendon Press.Google Scholar
Turner, B. R., 1991. Depositional environment and petrography of preglacial continental sediments from Hole 740A, Prydz Bay, East Antarctica. In Proceedings of the Ocean Drilling Program, Scientific Results, vol. 119 (eds Barron, J. and Larsen, B.), pp. 45–56. National Science Foundation and Joint Oceanographic Institutions, Inc.Google Scholar
Webb, J. A., & Fielding, C. R., 1993 a. Permo-Triassic sedimentation within the Lambert Graben, northern Prince Charles Mountains, East Antarctica. In Gondwana 8: Assembly, Evolution and Dispersal (eds Findlay, R. H., Unrug, R. J., Banks, M. R. and Veevers, J. J.), pp. 357–69. Rotterdam: A. A. Balkema.Google Scholar
Webb, J. A., & Fielding, C. R., 1993 b. Revised stratigraphical nomenclature for the Permo-Triassic Flagstone Bench Formation, northern Prince Charles Mountains, East Antarctica. Antarctic Science 5, 409–10.CrossRefGoogle Scholar
Wells, N. A., 1984. Sheet debris flow and sheetflood conglomerates in Cretaceous cool-maritime alluvial fans, South Orkney Islands, Antarctica. In Sedimentology of gravels and conglomerates (eds Koster, E. H. and Steel, R. J.), pp. 133–45. Canadian Society of Petroleum Geologists Memoir no. 10. Calgary: CSPG.Google Scholar