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Geochronological constraints on the trans-Hudsonian tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston-Mudjatik Transition Zone, Saskatchewan
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. Univ Bourgogne Franche Comté, France.
Univ Bourgogne Franche Comte, Lab Chronoenvironm UMR CNRS 6249, 16 Route Gray, F-25000 Besancon, France..
Univ Lille 1, EA Lab Genie Civil & Geoenvironm 4515, F-59655 Villeneuve Dascq, France..
Univ Rennes 1, UMR CNRS 6118, Geosci Rennes, OSUR, F-35042 Rennes, France..
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2017 (English)In: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 301, p. 152-178Article in journal (Refereed) Published
Abstract [en]

The Hudsonian Pressure-Temperature-Deformation-time-(P-T-D-t) evolution of the pre-Athabasca crystalline basement (>similar to 1700 Ma) of the Wollaston-Mudjatik Transition Zone (WMTZ) highlights two major tectono-metamorphic events Ml-Dl 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 the thinned Hearne margin via southward thrusting to pressures varying from 10 to 6 kbar, occurred between ca.1840 and 1813 Ma. The M2-D2 event, producing the northeast structural trend of the WMTZ, was formed in a sinistral transpressional tectonic regime during the late stage of the Hudsonian oblique collision between ca. 1813 and 1770 Ma. Thermobarometric estimates on the M2-D2 assemblages show that the entire studied area was reequilibrated at about 5 kbar and 750-825 degrees C. trans-Hudsonian pegmatites are viewed as the main proto-ore of the uranium-rich Athabasca unconformity-type deposits. Formation, transfer and differentiation of these trans-Hudsonian pegmatites are replaced in this P-T-D-t evolution. During the 1840-1813 Ma Ml-Dl partial melting event, the first batches of melt produced in the deep crust are the most likely enriched in uranium. Then, these melts were transferred upwards to the upper crustal levels owing to the development of crustal scale steeply-dipping D2 shear zones, and finally were differentiated to form uranium-enriched pegmatites between 1813 and 1770 Ma. Some monazite and zircon grains within retrogressed migmatites recorded a later event at ca. 1720 Ma, interpreted as the terminal cooling event down to 300-400 degrees C responsible for partial retrogression of metamorphic assemblages. This age provides new insights into the timing of the onset of the Athabasca sedimentation that should therefore be at least 1710 Ma old or younger.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 301, p. 152-178
Keywords [en]
LA-ICP-MS monazite and zircon geochronology, P-T-D-t evolution, Trans-Hudson Orogen, Wollaston-Mudjatik Transition Zone, Uranium-enriched pegmatites
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-340766DOI: 10.1016/j.precamres.2017.07.019ISI: 000413878400012OAI: oai:DiVA.org:uu-340766DiVA, id: diva2:1181239
Available from: 2018-02-08 Created: 2018-02-08 Last updated: 2018-02-08Bibliographically approved

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Jeanneret, Pauline

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