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AGU: Journal of Geophysical Research, Solid Earth

 

Keywords

  • airborne
  • magnetic
  • gravity
  • Lambert Rift
  • Antarctica
  • interpretation

Index Terms

  • Geomagnetism and Paleomagnetism: Magnetic anomalies: modeling and interpretation
  • Geodesy and Gravity: Gravity anomalies and Earth structure
  • Tectonophysics: Continental tectonics: extensional
  • Structural Geology: Regional crustal structure
Abstract
Cited By (4)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 114, B06101, 20 PP., 2009
doi:10.1029/2008JB005650

Basement interpretations from airborne magnetic and gravity data over the Lambert Rift region of East Antarctica

M. A. McLean

School of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia

C. J. L. Wilson

School of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia

S. D. Boger

School of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia

P. G. Betts

School of Geosciences, Monash University, Clayton, Victoria, Australia

T. J. Rawling

School of Earth Sciences, University of Melbourne, Parkville, Victoria, Australia

D. Damaske

Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, Germany

Geological exposures in the Lambert Rift region of East Antarctica comprise scattered coastal outcrops and inland nunataks sporadically protruding through the Antarctic ice sheet from Prydz Bay to the southernmost end of the Prince Charles Mountains. This study utilized airborne magnetic, gravity, and ice radar data to interpret the distribution and architecture of tectonic terranes that are largely buried beneath the thick ice sheet. Free-air and Bouguer gravity data are highly influenced by the subice and mantle topography, respectively. Gravity stripping facilitated the removal of the effect of ice and Moho, and the residual gravity data set thus obtained for the intermediate crustal level allowed a direct comparison with magnetic data. Interpretation of geophysical data also provided insight into the distribution and geometry of four tectonic blocks: namely, the Vestfold, Beaver, Mawson, and Gamburtsev domains. These tectonic domains are supported by surface observations such as rock descriptions, isotopic data sets, and structural mapping.

Received 20 February 2008; accepted 9 February 2009; published 3 June 2009.

Citation: McLean, M. A., C. J. L. Wilson, S. D. Boger, P. G. Betts, T. J. Rawling, and D. Damaske (2009), Basement interpretations from airborne magnetic and gravity data over the Lambert Rift region of East Antarctica, J. Geophys. Res., 114, B06101, doi:10.1029/2008JB005650.

Cited By

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