Relict Slabs Within the Roots of the Slave and Superior Provinces Observed With Deep-Looking Magnetotellurics

Details Relict Slabs Within the Roots of the Slave and Superior Provinces Observed With Deep-Looking Magnetotellurics Relict Slabs Within the Roots of the Slave and Superior Provinces Observed With Deep-Looking Magnetotellurics

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.t42a..03c&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #T42A-03

Other

0925 Magnetic And Electrical Methods, 1515 Geomagnetic Induction, 8110 Continental Tectonics: General (0905), 8149 Planetary Tectonics (5475)

Scientific paper

Important clues to the ancient origin of cratonic lithosphere can be found with deep looking magnetotelluric methods. Electrical strike direction observed in the western Superior Province of Canada show a dramatic correlation with crustal fabrics possibly related to Archean subduction. Upper mantle conductors with resistivities as low as 10 Ohm m embedded within the lithosphere of the Slave and Superior Provinces are approximately two orders of magnitude higher than petrophysical modelling predict for an olivine or pyroxene mineralogy dominated upper mantle. Given the depth location, age, and tectonic setting as well as the observed conductivity of these electrical conductors, we conclude that they are likely due to carbon in the form of interconnected graphite. The evidence for deep-seated graphitic conductors spatially related to other deep-seated geophysical and geochemical anomalies may be taken together with recent independent estimates of upper mantle oxygen fugacities that suggest the mantle was at some point within two log units of the iron-wüstite buffer to suggest that partial melting and formation of the cratonic root may be related to redox melting during Meso and Neo Archean times. The geometrical form of these conductors, in addition to other lines of evidence, can be taken as evidence for Archean subduction near the end of the major phase of craton formation.

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