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The muscovite ages record resetting and cooling related to the ca. Archibald Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, ON K7L 3N6ABSTRACTThe Brazil Lake pegmatite of southwestern Nova Scotia is a rare example of Li-Cs-Ta (LCT) -type pegmatite in the Meguma terrane of Nova Scotia. This spodumene-rich pegmatite is hosted by metasedimentary and metavolcanic rocks of the Silurian White Rock Formation, which records both Acadian and Alleghanian deformation. Oxygen-isotope geochemistry of the granitoid rocks in the Winnipeg River pegmatite district, southeastern Manitoba. Selby has been involved in the development and application of the Re-Os isotope system since 1999.His work initially focused on the systematic development of the Re-Os molybdenite chronometer, research that now allows routine age determinations for molybdenite, which is critical for evaluating the age and genesis of metallic ore deposits worldwide and the timing of fluid flow in terranes.