Tuesday, 28 August 2007 - 1:50 PM
2.P1.C-2

Magnetic susceptibility of West Antarctic Rocks

David J. Drewry, Office of the Vice-Chancellor, The University of Hull, Cottingham Road, Kingston-upon-Hull, HU16 4QB, United Kingdom and Ed J. Jankowski, RPS Group, c/o 63 Hauxton Road, Little Shelford, Cambridge, CB2 5HJ, United Kingdom.

An ensemble of geophysical techniques: airborne radio echo sounding, magnetic and gravity measurements, and  surface seismic refraction shooting provide high levels of resolution of the sub-ice surface and its material properties and hence geological inferences. Residual magnetic anomaly fields are produced by variations in the distribution of magnetised material in the uppermost crustal layers. To model possible structures and geological units from magnetic surveys magnetic susceptibilities are required. During long-range airborne geophysical missions in the late1970s by the Scott Polar Research Institute in conjunction with National Science Foundation and Technical University of Denmark magnetic data were collected over West Antarctica and have been previously reported by Jankowski. To assist their interpretation magnetic susceptibility measurements were made, and here reported, of rocks specimens from West Antarctic outcrops collected or assembled by Cam Craddock. Examples of their use in the modelling the geophysical architecture of West Antarctica are given.

[Manuscript]

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