Proposed Title 1: - Queen's University

and coincident with the timing of major thermotectonic events that have affected these
areas. Results show that periods of alteration and remobilization events recorded over 2 Gyr
of tectonic evolution of the North American Shield and the Australian craton.
Early vein and cataclasite-type U mineralization in the Beaverlodge area was
significantly affected by the 2.2-2.1 Ga and 2.1-2.0 Ga tectonism coincident with a period
of rifting related to the breakup of the Kenorland supercontinent (Williams et al., 1991).
This event is followed by the 2.0-1.9 Ga period of alteration during the Taltson-Thelon
Orogen (Chacko et al., 2000) and activation of the Snowbird Tectonic Zone (Berman et al.,
2007a).
A major event, which has significantly reactivated structures in the Beaverlodge area,
corresponds to the Trans-Hudson Orogen, which produced brecciation along reactivated
fault zones, fluid flow and the major U mineralization. This mineralization has been altered
during intracratonic deformation following the peak Trans-Hudson Orogen and formation
of the Martin Lake Basin (Mazimhaka and Hendry, 1985). The event has produced the
volcanic-type mineralization and subsequent alteration during emplacement of 1788±3 Ma
lamprophyre (Sassano et al., 1974) and granitic dikes (Ashton et al., 2009b).
Late brittle reactivation along fault zones during the Mesoproterozoic caused minor
fracturing and alteration of preexisting mineralization and records tectonism of the 1.65-
1.60 Ga Mazatzal Orogen in southern Laurentia (Labrenze and Karlstrom, 1991).
From the Mesoproterozoic to recent time, far field tectonic events of several
orogenic episodes during the evolution of the Laurentian plate (e.g. Evans and Pisarevsky,
2008) caused minor brittle reactivation in the Beaverlodge area. These include the Granite
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