Proposed Title 1: - Queen's University

The basement consist of Neoarchean granitoids (Ashton et al., 2004) including the
Elliot Bay (3014 Ma; Persons, 1983), Lodge Bay (3060 Ma; O’Hanley, et al., 1991) and
Cornwall Bay (2999 Ma; Hartlaub et al., 2004a) granites. The overlying Neoarchean to
Paleoproterozoic supracrustal Murmac Bay Group (Hartlaub and Ashton, 1998; Hartlaub
et al., 2004a) is composed of metamorphosed and moderately to highly deformed
supracrustal rocks consisting of a basal quartzite, basalt, ultramafic to intermediate
igneous rocks, and psammite and pelite with minor amounts of conglomerate, banded iron
formation, and carbonates rocks (Hartlaub and Ashton, 1998; Ashton et al., 2004). The
Murmac Bay Group was variably metamorphosed from granulite facies to lower
greenschist facies (Hartlaub and Ashton, 1998). Recent work indicates that the basal
quartzo-feldpathic units of the Murmac Bay Group have a maximum depositional age of
2.33 Ga (Hartlaub et al., 2004a). The Murmac Bay Group is intruded by a suite of ca.
2.33–2.30 Ga granites known as ‘North Shore Plutons’ (Macdonald et al., 1985) including
the 2321±3 Ma Gunnar granite (Hartlaub et al., 2004a) that is associated with a major U
deposit in the Beaverlodge area (Fig. 3.2). The tectonic environment of the plutonic suite
and the depositional setting of the Murmac Bay Group and their timing relationships to
deformation are still poorly understood.
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