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In the southern Melville Peninsula, strong radioactive element patterns, measured by reconnaissance airborne gamma-ray spectrometry, clearly discriminate Archean orthogneiss and various Archean and Proterozoic plutonic rocks. Similar geological units occur in the central Baffin Island region. In 2000, a brief field study was conducted in central Baffin Island to determine if radioactive element (K, eU, and eTh) variations measured by ground gamma-ray spectrometry can be used to assist ongoing geological mapping activities. Although radioactive element concentrations are generally low in the supracrustal rocks of the Piling Group, variation in K and eTh concentrations are associated with lithological variations. Basement rocks, composed of Archean orthogneiss and various Archean and Proterozoic granitic intrusions, produce strong radioactive element contrasts. Young pegmatite plutons can be distinguished from older intrusions by low eTh concentrations and high eU/eTh ratios. Various Archean and Proterozoic intrusions also have characteristic radioactive element signatures which distinguish them from Archean orthogneiss. 2001-E4 K.L. Ford 1 CURRENT RESEARCH RECHERCHES EN COURS 2001 Article Article Titles Titres Purchase Information Information pour acheter

Reconnaissance gamma-ray spectrometry studies of the Paleoproterozoic Piling Group and adjacent Archean basement rocks, central Baffin Island, Nunavut