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TitleArea selection for diamond exploration using deep-probing electromagnetic surveying
AuthorJones, A G; Craven, J A
Source8th International Kimberlite Conference: extended abstract; 2003, 4 pages
Alt SeriesGeological Survey of Canada, Contribution Series 2004044
Meeting8th International Kimberlite Conference; Victoria, BC; CA; June 22-27, 2003
File formatpdf
Subjectseconomic geology; geophysics; mineralogy; diamond; kimberlites; magnetic interpretations; magnetic anomalies; magnetic surveys; magnetic surveys, airborne; magnetotelluric field; magnetotelluric interpretations; magnetotelluric surveys; magnetotelluric data; lithosphere; conductivity; graphite-diamond stability field
Illustrationsgraphs; schematic diagrams
ProgramIndian and Northern Affairs Canada, Funding Program
LinksOnline - En ligne
Previously proposed methods of area selection for diamond-prospective regions have predominantly relied on till geochemistry, airborne geophysics, and/or an appraisal of tectonic setting. Herein we suggest that a novel, deep-probing geophysical technique-electromagnetic studies using the natural-source magnetotelluric (MT) method-can contribute to such an activity. Essentially, diamondiferous regions must have (1) old lithosphere, (2) thick lithosphere, and (3) lithosphere that contains high concentrations of carbon. Deep-probing MT studies are able to address all three of these. The second and the third of these can be accomplished independently using MT, but for the first the geometries produced from modelling the MT observations must be interpreted with appropriate interaction with geologists, geochemists and other geophysicists. Examples are given from the Slave and Superior cratons in North America, with a brief mention of an area of the Rae craton, and general speculations about possible diamondiferous regions.