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TitleRegional geology and tectonic framework of the Southern Indian domain, Trans-Hudson Orogen, Manitoba
AuthorMartins, T; Rayner, NORCID logo; Corrigan, DORCID logo; Kremer, P
SourceCanadian Journal of Earth Sciences 2021 p. 1-18, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210394
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf; html
NTS64A/13; 64A/14; 64A/15; 64B/15; 64B/16; 64G/01; 64G/02; 64G/07; 64G/08; 64G/09; 64G/10; 64H/02; 64H/03; 64H/04; 64H/05; 64H/06; 64H/07; 64H/10; 64H/11; 64H/12
AreaSouthern Indian Lake
Lat/Long WENS -98.9667 -96.9833 57.7000 56.9833
Subjectsregional geology; tectonics; geochronology; geochemistry; Science and Technology; Nature and Environment; bedrock geology; basement geology; lithology; lithogeochemistry; isotopic studies; tectonic evolution; magmatism; intrusions; emplacement; volcanism; rifting; orogenies; basins; sedimentation; accretion; metamorphism; crustal evolution; radiometric dating; detrital minerals; Archean; Southern Indian Domain; Trans-Hudson Orogen; Partridge Breast Block; Churchill River Assemblage; Hearne Craton; Pukatawakan Bay Assemblage; Partridge Breast Lake Assemblage; Strawberry Island Assemblage; Whyme Bay Assemblage; Sickle Group; Lynn Lake Greenstone Belt; Manikewan Ocean; Turtle Island Complex; Northern Indian Pluton; Chipewyan-Wathaman Batholith; Collaborative research; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photographs; plots; ternary diagrams; bar graphs; tables; schematic representations
ProgramScience laboratory network
Released2021 12 22
AbstractThe collaborative federal-provincial Southern Indian Lake project in north-central Manitoba covered an area of more than 3500 km2 of the Trans-Hudson orogen. Regional-scale geological mapping, sampling, and lithogeochemical, isotopic, and geochronological studies resulted in the identification of distinct assemblages of supracrustal rocks and varied episodes of plutonism. A granodiorite gneiss dated at ca. 2520 Ma is interpreted to represent the basement of the Southern Indian domain and is considered a separate crustal domain, named the Partridge Breast block. The Churchill River assemblage is composed of juvenile pillow basalt with intervening clastic sedimentary rocks, possibly a reflection of plume magmatism related to initial rifting of the Hearne craton margin. The Pukatawakan Bay assemblage consists mainly of massive to pillowed, juvenile metabasaltic rocks and associated basinal metasedimentary rocks. The Partridge Breast Lake assemblage is dominated by continental-arc volcanic and volcaniclastic rocks associated with basinal metasedimentary rocks. The Strawberry Island assemblage, consisting of arenite and polymictic conglomerate, is interpreted to have been deposited in a foreland-basin basin or intra-orogen pull-apart basin environment. The Whyme Bay assemblage is characterized by fluvial-alluvial orogenic sediments and is temporally linked to the Sickle Group rocks in the Lynn Lake greenstone belt. Granitoid rocks, dominantly monzogranite and granodiorite, range in age from ca. 1890 to 1830 Ma and occur throughout the Southern Indian domain, and intermediate and mafic intrusions of similar ages are also present. In this paper, we integrate these new data into a tectonic framework for the Southern Indian domain of the Trans-Hudson orogen in Manitoba.
Summary(Plain Language Summary, not published)
This article summarizes the results of a regional scale bedrock mapping project in and around Southern Indian Lake in northern Manitoba, carried out by both provincial and federal geological surveys between 2002-2016. It presents a revised and refined tectonic model for this segment of the Trans-Hudson Orogen based on field characteristics, petrography, and geochemical and isotopic characterization. The tectonic framework presented herein is a consolidation and integration of data originally presented in detail in a number of provincial and federal reports but until now had not been considered as a single, integrated dataset.

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