CBEX: Central Baffin electromagnetic experiment
Jones, A.G., J. Spratt and S. Evans
As part of the GSC's Central Baffin PAS project, a fifteen-station regional-scale
magnetotelluric profile was acquired during Summer 2001 crossing the northern
margin of Trans-Hudson Orogen on Baffin Island. The primary goal was determining
the subsurface geometry of major geological boundaries, particularly between
Archean Rae craton rocks and overlying Paleoproterozoic continental margin units.
The most significant conclusion reached from preliminary analyses and modelling
is that the highly conductive iron, sulphide and graphite-rich Astarte River
formation, a distinctive stratigraphic marker horizon within the Paleoproterozoic
Piling Group, is electrically disconnected to similar rocks found in the south.
This could suggest that Archean rocks to the south are not related to Rae craton
rocks to the north, or that tectonic imbrication has disconnected northern and
southern segments. Either way, the results indicate that the Piling group rocks
do not sit within a synformal basin structure.
Geol. Surv. Canada Current Research, 2002-C19, 5 p., 2002.
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Alan G Jones / 10 June 2004 /