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High-resolution airborne gravity imaging over James Ross Island (West Antarctica)

Jordan, T.A.; Ferraccioli, F.; Jones, P.D.; Smellie, J.L.; Ghidella, M.; Corr, H.; Zakrajsek, A.F.. 2007 High-resolution airborne gravity imaging over James Ross Island (West Antarctica). In: Cooper, A.K.; Raymond, C.R.; ISAES Editorial Team, ., (eds.) Antarctica: a keystone in a changing world. Online proceedings of the 10th International Symposium on Antarctic Earth Sciences, Santa Barbara, California, August 26 - September 1, 2007. National Academy Press, 4pp. (U.S. Geological Survey Open-File Report, 2007-1047. Short).

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Abstract/Summary

James Ross Island (JRI) exposes a Miocene-Recent alkaline basaltic volcanic complex that developed in a back-arc, east of the northern Antarctic Peninsula. JRI has been the focus of several geological studies because it provides a window on Neogene magmatic processes and paleoenvironments. However, little is known about its internal structure. New airborne gravity data were collected as part of the first high-resolution aerogeophysical survey flown over the island and reveal a prominent negative Bouguer gravity anomaly over Mt Haddington. This is intriguing as basaltic volcanoes are typically associated with positive Bouguer anomalies, linked to underlying mafic intrusions. The negative Bouguer anomaly may be associated with a hitherto unrecognised low-density sub-surface body, such as a breccia-filled caldera, or a partially molten magma chamber. Citation: T. A. Jordan, F. Ferraccioli, P. C. Jones, J. L. Smellie,

Item Type: Publication - Book Section
Digital Object Identifier (DOI): 10.3133/of2007-1047.srp060
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Greenhouse to Icehouse. Evolution of the Antarctic Cryosphere and Palaeoenvironment
NORA Subject Terms: Earth Sciences
Date made live: 01 Nov 2011 15:18
URI: http://nora.nerc.ac.uk/id/eprint/15750

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