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TitleA detailed description of the Hoare Bay group and Paleoproterozoic plutonic rocks near Mischief Glacier and Clephane Bay, Cumberland Peninsula, Baffin Island, Nunavut
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AuthorHamilton, B M
SourceGeological Survey of Canada, Current Research (Online) no. 2014-3, 2014, 23 pages, https://doi.org/10.4095/293891
Year2014
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceNunavut
NTS16L/02; 16L/03; 16L/08; 16L/09
AreaBaffin Island; Mischief Glacier; Clephane Bay; Cumberland Peninsula
Lat/Long WENS-64.0000 -61.5000 66.7500 66.0000
Subjectsstratigraphy; structural geology; igneous and metamorphic petrology; tectonics; bedrock geology; metamorphic rocks; schists; gneisses; volcanic rocks; plutonic rocks; iron formations; structural features; folds; lithostratigraphy; tectonic elements; tectonic environments; metamorphism; tectonic history; lithostratigraphy; Hoare Bay Group; Precambrian; Proterozoic
Illustrationslocation maps; photographs; stratigraphic columns
ProgramMultiple Metals - Cumberland Peninsula (Baffin Island, Nunavut), GEM: Geo-mapping for Energy and Minerals
Released2014 07 16
AbstractDetailed bedrock mapping of the Paleoproterozoic Hoare Bay group in central Cumberland Peninsula, Nunavut revealed that the stratigraphy can be divided into three distinct sucessions. The lower succession comprises mostly pelitic and semipelitic schist, with metamorphosed ultramafic-mafic volcanic and plutonic rocks, quartzite, carbonate-silicate gneiss, and metamorphosed sulphide iron-formation. The middle succession consists of metamorphosed ultramafic-mafic volcanic and plutonic rocks below metamorphosed iron-formation. The upper succession is a sequence of semipelitic and psammitic schist with a unit of ultramafic-mafic volcanic and plutonic rocks. Tabular, composite bodies of leucomonzogranite to tonalite gneiss, monzodiorite to gabbro gneiss, and hornblendite intruded into the Hoare Bay group. A correlation of stratigraphy between map areas implies the eastern map area exposes the overturned limb of a nappe-style fold. There are two generations of subparallel outcrop-scale folds in both map areas; the earlier generation is associated with an axial-planar fabric. Metabasite mineral assemblages are part of the amphibolite facies and metapelitic rocks are in the muscovite+sillimanite metamorphic zone. Based on lithostratigraphy, the Hoare Bay group shares a number of similarities with the Karrat Group in West Greenland.
Summary(Plain Language Summary, not published)
The Hoare Bay group (HBg) of Cumberland Peninsula, Baffin Island, Nunavut may have potential for gold and base metals based on possible correlations with similar sedimentary and volcanic rocks on Greenland and elsewhere on Baffin. This study examined the HBg in detail, documenting the stratigraphic sequence, its deformation and metamorphism, and strengthening a correlation with the mineralized Karrat Group of Greenland. During mountain-building about 1.8 billion years ago, the sequence was deformed in 3 events as it was buried to >12 km depth and heated to 575-650°C.
GEOSCAN ID293891