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Arc evolution: a magnetic perspective from the Antarctic Peninsula

Published online by Cambridge University Press:  07 April 2017

A. C. Johnson
A. C. Johnson
Affiliation:
British Antarctic Survey, Natural Environment Research Council, High Cross, Cambridge, CB3 0ET, UK
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Abstract

The Antarctic Peninsula is a Mesozoic–Cenozoic magmatic arc built on Palaeozoic and younger basement. It was formed by processes related to the subduction of Pacific ocean floor at its western margin, although subduction has now ceased along most of its length. The peninsula features all the tectonic components commonly associated with a developing arc system: basement, accretionary complex, magmatic arc, arc-related basins, intra-arc extension and post-subduction volcanism. Seventeen thousand kilometres of high resolution aeromagnetic data have recently been collected in a transect across part of the arc, covering an area 290 by 230 km and incorporating examples of most of the above tectonic components. The new map reveals distinct magnetic signatures, which can now be related to each of these components in a way that was not possible with reconnaissance data sets. A characteristic magnetic anomaly pattern for each component is described and comparisons drawn with magnetic studies of other arc regions.

Type
Research Article
Information
Geological Magazine , Volume 133 , Issue 6 , November 1996 , pp. 637 - 644
Copyright
Copyright © Cambridge University Press 1996

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References

Anderson, J. B., Pope, P. G. & Thomas, M. A. 1990. Evolution and hydrocarbon potential of the northern Antarctic Peninsula Continental Shelf In Antarctica as an exploration frontier (ed. St. John, B.), pp. 1–12. American Association of Petroleum Geologists, Studies in Geology no. 31.Google Scholar
Barker, P. F. 1982. The Cenozoic subduction history of the Pacific margin of the Antarctic Peninsula: ridge crest-trench interactions. Journal of the Geological Society, London 139, 787–801.CrossRefGoogle Scholar
Bateman, P. C. 1983. A summary of critical relations in the central part of the Sierra Nevada batholith, California, USA. In Circum-Pacific plutonic terranes (ed. Roddick, J. A.), pp. 241–54. Geological Society of America, Memoir no. 159.CrossRefGoogle Scholar
Bateman, P. C., Dodge, F. C. W. & Kistler, R. W. 1991. Magnetic susceptibility and relation to initial 87Sr/86Sr for granitoids of the central Sierra Nevada, California. Journal of Geophysical Research 96, 19555–68.CrossRefGoogle Scholar
Bruce, R. M., Nelson, E. P., Weaver, S. G. & Lux, D. R. 1991. Temporal and spatial variations in the southern Patagonian batholith; constraints on magmatic arc development. In Andean magmatism and its tectonic setting (eds Harmon, R. S. and Rapela, C. W.), pp. 1–12. Boulder: Geological Society of America Special Paper no. 265.Google Scholar
Burn, R. W. 1984. The geology of the LeMay Group, Alexander Island. British Antarctic Survey Scientific Report 109, 1–65.Google Scholar
Crabtre, R. D., Storey, B. C. & Doake, C. S. M. 1985. The structural evolution of George VI Sound, Antarctic Peninsula. Tectonophysics 114, 431–42.CrossRefGoogle Scholar
Dalziel, I. W. D. & Elliot, D. H. 1982. West Antarctica: Problem child of Gondwanaland. Tectonics 1, 3–19.CrossRefGoogle Scholar
Finn, C. 1990. Geophysical constraints on Washington convergent margin structure. Journal of Geophysical Research 95, 19533–46.CrossRefGoogle Scholar
Finn, C. 1994. Aeromagnetic evidence for a buried Early Cretaceous magmatic arc, northeast Japan. Journal of Geophysical Research 99, 22165–85.CrossRefGoogle Scholar
Fleming, E. A. & Thomson, J. W. (compilers) 1979. Northern Graham Land and South Shetland Islands. Geological map 1: 500 000, BAS 500G series Sheet 2. Cambridge: British Antarctic Survey.Google Scholar
Gambo˚a, L. A. P. & Maldonado, P. R. 1990. Geophysical investigations in the Bransfield Strait and in the Bellingshausen Sea-Antarctica. In Antarctica as an exploration frontier (ed. St. John, B.), pp. 127–41. American Association of Petroleum Geologists, Studies in Geology no. 31.Google Scholar
Garrett, S. W. 1990. Interpretation of reconnaissance gravity and aeromagnetic surveys of the Antarctic Peninsula. Journal of Geophysical Research 95, 6759–77.CrossRefGoogle Scholar
Garrett, S. W. & Storey, B. C. 1987. Lithospheric extension on the Antarctic Peninsula during Cenozoic subduction. In Continental Extensional Tectonics (eds Coward, M. P., Dewey, J. F. and Hancock, P. L.), pp. 419–31. Geological Society Special Publication no. 28.Google Scholar
Ghidella, M. E., Raymond, C. A. & Labrecque, J. L. 1991. Verification of crustal sources for satellite elevation magnetic anomalies in West Antarctica and the Weddell Sea and their regional tectonic implications. In Geological Evolution of Antarctica (eds Thomson, M. R. A., Crame, J. A. and Thomson, J. W.), pp. 243–50. Cambridge: Cambridge University Press.Google Scholar
Gledhill, A., Rex, D. C. & Tanner, P. W. G. 1982. Rb-Sr and K-Ar geochronology of rocks from the Antarctic Peninsula between Anvers Island and Marguerite Bay. In Antarctic Geoscience (ed. Craddock, C.), pp. 315–23. Wisconsin: University of Wisconsin Press.Google Scholar
Grocott, J., Brown, M., Dallmeyer, R. D., Taylor, G. K. & Treloar, P. J. 1994. Mechanisms of continental growth in extensional arcs: An example from the Andean plate-boundary zone. Geology 22, 391–4.2.3.CO;2>CrossRefGoogle Scholar
Grunow, A. M., Dalziel, I. W. D., Harrison, M. T. & Heizler, M. T. 1992. Structural geology and geochronology of subduction complexes along the margin of Gondwanaland: New data from the Antarctic Peninsula and southernmost Andes. Geological Society of America Bulletin 104, 1497–1514.2.3.CO;2>CrossRefGoogle Scholar
Harrison, S. M. & Piercy, B. A. 1991. Basement gneisses in north-western Palmer Land: further evidence for pre-Mesozoic rocks in Lesser Antarctica. In Geological Evolution of Antarctica (eds Thomson, M. R. A., Crame, J. A. and Thomson, J. W.), pp. 341–4. Cambridge: Cambridge University Press.Google Scholar
Hole, M. J. 1990. Geochemical evolution of Pliocene-Recent post-subduction alkalic basalts from Seal Nunataks, Antarctic Peninsula. Journal of Volcanology and Geothermal Research 40, 149–67.CrossRefGoogle Scholar
Hole, M. J., Rogers, G., Saunders, A. D. & Storey, M. 1991. Relation between alkalic volcanism and slab-window formation. Geology 19, 657–60.Google Scholar
Hole, M. J., Pankhurst, R. J. & Saunders, A. D. 1991. Geochemical evolution of the Antarctic Peninsula magmatic arc: the importance of mantle-crust interactions during granitoid genesis. In Geological Evolution of Antarctica (eds Thomson, M. R. A., Crame, J. A. and Thomson, J. W.), pp. 369–74. Cambridge: Cambridge University Press.Google Scholar
Hooper, P. R. 1962. The petrology of Anvers Island and adjacent islands. Falkland Islands Dependencies Survey Scientific Report 34, 1–69.Google Scholar
IAGA Division V Working Group 8. 1992. International Geomagnetic Reference Field, 1991 revision. Geophysics 57, 956–9.CrossRefGoogle Scholar
Johnson, A. C. & Swain, C. J. 1995. Further evidence of fracture-zone induced tectonic segmentation of the Antarctic Peninsula from detailed aeromagnetic anomalies. Geophysical Research Letters 22, 1917–20.CrossRefGoogle Scholar
Johnson, P. R., Zietz, I. & Bond, K. R. 1990. U.S. west coast revisited: An aeromagnetic perspective. Geology 18, 332–5.2.3.CO;2>CrossRefGoogle Scholar
Larter, R. D. & Barker, P. F. 1991a. Effects of ridge crest-trench interaction on Antarctic-Phoenix spreading: forces on a young subducting plate. Journal of Geophysical Research 96, 19583–607.Google Scholar
Larter, R. D. & Barker, P. F. 1991b. Neogene interaction of tectonic and glacial processes at the Pacific margin of the Antarctic Peninsula. In Sedimentation, Tectonics and Eustasy (ed. Macdonald, D. I. M.), pp. 165–86. International Association of Sedimentology Special Publication no. 12.CrossRefGoogle Scholar
Larter, R. D., Rebesco, M., Vanneste, L. E., Gambo˚a, L. A. P. & Barker, P. F. 1994. Seismic reflection investigations on the Pacific margin of the Antarctic Peninsula. Terra Antartica 1, 271–4.Google Scholar
Leat, P. T., Scarrow, J. H., & Millar, I. L. 1995. On the Antarctic Peninsula batholith. Geological Magazine 132, 399–412.CrossRefGoogle Scholar
MacDonald, D. I. M., Barker, P. F., Garrett, S. W., Ineson, J. R., Pirrie, D., Storey, B. C., Whitham, A. G., Kinghorn, R. R. F. & Marshall, J. E. A. 1988. A preliminary assessment of the hydrocarbon potential of the Larsen Basin, Antarctica. Marine and Petroleum Geology 5, 34–53.CrossRefGoogle Scholar
Maldonado, A., Larter, R. D. & Aldaya, F. 1994. Forearc tectonic evolution of the South Shetland margin, Antarctic Peninsula. Tectonics 13, 1345–70.Google Scholar
Maslanyj, M. P., Garrett, S. W, Johnson, A. C., Renner, R. G. B. & Smith, A. M. 1991. Aeromagnetic anomaly map of West Antarctica (Weddell Sea Sector). 1:2500000, British Antarctic Survey GEOMAP series Sheet 2, with supplementary text. Cambridge: British Antarctic Survey, 32 pp.Google Scholar
McGibbon, K. J. & Wever, H. E. 1991. Magnetic evidence for gabbroic plutons in the Black Coast area, Palmer Land (Extended Abstract). In Geological Evolution of Antarctica (eds Thomson, M. R. A., Crame, J. A. and Thomson, J. W.), pp. 395–8. Cambridge: Cambridge University Press.Google Scholar
Milne, A. J. & Millar, I. L. 1989. The significance of mid-Palaeozoic basement in Graham Land, Antarctic Peninsula. Journal of the Geological Society, London 146, 207–10.Google Scholar
Moyes, A. B. & Storey, B. C. 1986. The geochemistry and tectonic setting of gabbroic rocks in the Scotia Arc region. British Antarctic Survey Bulletin 73, 51–69.Google Scholar
Pankhurst, R. J. 1982. Rb-Sr geochronology of Graham Land, Antarctica. Journal of the Geological Society, London 139, 701–11.CrossRefGoogle Scholar
Pankhurst, R. J., Hole, M. J. & Brook, M. 1988. Isotopic evidence for the origin of Andean granites. Transactions of the Royal Society of Edinburgh: Earth Sciences 79, 123–33.Google Scholar
Parra, J. C., Gonzalez-Ferran, O. & Bannister, J. 1984. Aeromagnetic survey over the South Shetland Islands, Bransfield Strait and part of the Antarctic Peninsula. Revista Geologica de Chile 23, 3–20.Google Scholar
Renner, R. G. B. 1980. Gravity and magnetic surveys in Graham Land. British Antarctic Survey Scientific Report 77, 1–99.Google Scholar
Renner, R. G. B., Sturgeon, L. J. S. & Garrett, S. W. 1985. Reconnaissance gravity and aeromagnetic surveys of the Antarctic Peninsula. British Antarctic Survey Scientific Report 110, 1–50.Google Scholar
Saunders, A. D., Weaver, S. D. & Tarney, J. 1982. The pattern of Antarctic Peninsula plutonism. In Antarctic Geoscience (ed. Craddock, C.), pp. 305–14. Wisconsin: University of Wisconsin Press.Google Scholar
Scharnberger, C. K. & Scharon, L. 1982. Paleomagnetism of rocks from Graham Land and western Ellsworth Land, Antarctica. In Antarctic Geoscience (ed. Craddock, C.), pp. 371–5. Wisconsin: University of Wisconsin Press.Google Scholar
Smellie, J. L. 1987. Geochemistry and tectonic setting of alkaline volcanic rocks in the Antarctic Peninsula: a review. Journal ofVolcanology and Geothermal Research 32, 269–85.Google Scholar
Smellie, J. L., Moyes, A. B., Marsh, P. D. & Thomson, J. W. 1985. Geology of Hugo Island, Quintana Island, Sooty Rock, Betbeder Islands and parts of the Biscoe and Outcast islands. British Antarctic Survey Bulletin 68, 91–100.Google Scholar
Storey, B. C. & Garrett, S. W. 1985. Crustal growth of the Antarctic Peninsula by accretion, magmatism and extension. Geological Magazine 122, 5–14.CrossRefGoogle Scholar
Thomson, J. W & Harris, J. (compilers) 1981. Southern Graham Land. Geological Map, 1: 500000, BAS 500G series Sheet 3. Cambridge: British Antarctic Survey.Google Scholar
Thomson, M. R. A. 1982. Mesozoic paleogeography of West Antarctica. In Antarctic Geoscience (ed. Craddock, C.), pp. 331–7. Wisconsin: University of Wisconsin Press.Google Scholar
Vaughan, A. M. P. & Millar, I. L. 1996. Early Cretaceous magmatism during extensional deformation within the Antarctic Peninsula magmatic arc. Journal of South American Earth Sciences 9 (in press).CrossRefGoogle Scholar
West, S. M. 1974. The geology of the Danco Coast, Graham Land. British Antarctic Survey Scientific Report 84, 1–58.Google Scholar