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TitleNew results from geological mapping in the west-central and northeastern portions of Southern Indian Lake, Manitoba (parts of NTS 64G1, 2, 8, 64H4, 5)
AuthorKremer, P D; Rayner, N; Corkery, M T
SourceManitoba Science, Technology, Energy and Mines, Manitoba Geological Survey, Report of Activities 2009, 2009 p. 94-107
Alt SeriesEarth Sciences Sector, Contribution Series 20090256
NTS64G/01; 64G/02; 64G/08; 64H/04; 64H/05
AreaSouthern Indian Lake; Partridge Breast Lake; Gauer Lake; Pukatawakan Bay
Lat/Long WENS-99.0000 -97.5000 57.5000 57.0000
Subjectsstratigraphy; structural geology; geochemistry; geochronology; bedrock geology; metamorphic rocks; metasedimentary rocks; igneous rocks; volcanic rocks; plutonic rocks; Archean; radiometric dates; radiometric dating; uranium lead dates; uranium lead dating; Precambrian; Proterozoic
Illustrationslocation maps; photographs; Concordia diagrams; plots
ProgramFlin Flon TGI-3, Targeted Geoscience Initiative (TGI-3), 2005-2010
AbstractThis report summarizes results from new whole-rock geochemical, isotopic, and geochronological analyses conducted on rock samples collected during the 2008 mapping campaign in the Pukatawakan Bay area, as well as during new bedrock mapping in and around the northeastern portion of Southern Indian Lake, Partridge Breast Lake, and Gauer Lake in northern Manitoba (Kremer et al., 2009).
The Southern Indian Domain in northern Manitoba is dominated by variably migmatitic metasedimentary rocks with minor screens of volcanic rocks, and variable amounts of plutonic rocks (Corrigan et al., 2007). Two belts dominated by volcanic rocks occur in the westcentral (Pukatawakan Bay) and northeastern (Partridge Breast Lake) parts of Southern Indian Lake. In the Pukatawakan Bay area, a continuous sequence of juvenile pillowed to massive mafic volcanic flows is tectonically juxtaposed with Archean (ca. 2.5 Ga) ortho- and paragneiss. To the southeast in Whyme Bay, isotopically evolved arc volcanic and volcaniclastic rocks and overlying clastic sedimentary rocks are preserved as kilometre-scale screens in a quartz-dioritic to monzogranitic intrusion. The Partridge Breast Lake area is dominated by mafic to felsic arc volcaniclastic, resedimented volcaniclastic and sedimentary sequences, which are themselves
overlain by polymictic conglomerate with lesser amounts of quartz and feldspathic arenite. The supracrustal sequences in both areas were flooded by voluminous granitic intrusions between ca. 1.86 and 1.80 Ga.
New bedrock mapping and laboratory analyses of the rocks in the Southern Indian Lake area have provided further insights into the tectonomagmatic evolution of the Trans-Hudson Orogen in northern Manitoba. Rocks exposed in the Southern Indian Lake area record the development and closure of the Paleoproterozoic Manikewan ocean between the Archean Rae-Hearne, Superior and Sask cratons; the development and accretion of volcanic arc complexes and associated basinal sedimentary sequences to the southern margin of the Archean Rae-Hearne craton; continental arc magmatism; orogenic sedimentation; and intrusion of late- to post-orogenic plutonic