Geochronological constraints on the trans-Hudsonian tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston-Mudjatik Transition Zone, Saskatchewan

摘要

Highlights?Accurate and continuous P-T-D-t path for the Wollaston-Mudjatik Transition Zone.?The first tectono-metamorphic event (M1-D1) took place between ca.1840 and 1813Ma.?The second tectono-metamorphic event (M2-D2) took place between ca.1813 and 1770Ma.?Multistage genetic model for Uranium-enriched pegmatite based on this P-T-D-t evolution.AbstractThe Hudsonian Pressure-Temperature-Deformation-time-(P-T-D-t) evolution of the pre-Athabasca crystalline basement (>～1700Ma) of the Wollaston-Mudjatik Transition Zone (WMTZ) highlights two major tectono-metamorphic events M1-D1 and M2-D2. The ages of these two event have been obtained by in-situ LA-ICPMS U-Th-Pb dating of monazite from Grt-Crd bearing pelitic gneiss and U-Pb analyses performed on zircons from pegmatites, using both exposed basement and drill cores from the Wolly–McClean exploration drilling project. The M1-D1 event, interpreted as the burial of th