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TitleGeology, Grinnell Glacier, Baffin Island, Nunavut
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AuthorSt-Onge, M R; Rayner, N M; Steenkamp, H M; Gilbert, C
SourceGeological Survey of Canada, Canadian Geoscience Map 217S, 2015, 1 sheet, https://doi.org/10.4095/296112
Year2015
Alt SeriesCanada-Nunavut Geoscience Office Open File Map 2015-04S
Alt Series217
PublisherNatural Resources Canada
Editionprelim.
Documentserial
Lang.Inuktitut
Maps1 map
Map Info.geological, bedrock, structural geology, 1:100,000
ProjectionUniversal Transverse Mercator Projection, zone 19 (NAD83)
Mediadigital; on-line
RelatedThis publication is a translation of St-Onge, M R; Rayner, N M; Steenkamp, H M; Gilbert, C; (2015). Geology, Grinnell Glacier, Baffin Island, Nunavut, Geological Survey of Canada, Canadian Geoscience Map no. 217E, ed. prelim.
File formatreadme
File formatrtf; pdf; shp; xml; JPEG2000
ProvinceNunavut
NTS25J/10; 25J/11; 25J/12; 25J/13; 25J/14; 25J/15; 25K/09; 25K/16; 25N/01; 25O/01; 25O/02; 25O/03; 25O/04
AreaBaffin Island; Greinnell Glacier
Lat/Long WENS-68.5000 -66.4167 63.2500 62.5000
Subjectsstructural geology; stratigraphy; bedrock geology; igneous rocks; plutonic rocks; metamorphic rocks; metasedimentary rocks; diorites; leucogranites; monzo-granites; metagabbros; peridotites; psammites; quartzites; gneisses; deformation; structural features; faults; folds; metamorphism; Archean; Proterozoic; Precambrian
Illustrationslocation maps; photographs
ProgramBaffin Bedrock Mapping, GEM2: Geo-mapping for Energy and Minerals
Image
Released2015 04 14
AbstractThis map synthesizes the field observations and initial interpretations for the Grinnell Glacier area following five weeks of regional and targeted bedrock mapping on the eastern Meta Incognita Peninsula, Baffin Island, Nunavut. Under the Geo-mapping for Energy and Minerals (GEM) Program, this area was targeted in 2014 to upgrade the geoscience knowledge and document the economic potential of the greater Iqaluit area south of Frobisher Bay. Field observations have constrained the distribution of metasedimentary units comprising quartzite, marble, psammite, pelite, and semipelite, all of which can be correlated with the contiguous middle Paleoproterozoic Lake Harbour Group in the type area north of Kimmirut. The spatial distribution of a suite of layered mafic to ultramafic sills intrusive into the sedimentary strata in the western portion of the Grinnell Glacier map area was also documented and will be the focus of further study. Layering in the sills was observed on the centimetre to metres scale, with many bodies containing disseminated sulphide, some associated with ferricrete. The distribution of high-grade felsic and mafic plutonic rocks, tentatively interpreted as part of the middle Paleoproterozoic Cumberland Batholith, were delineated. Four distinct phases of deformation and two metamorphic episodes were recognized. The deformation and metamorphic events can be correlated with similar features and assemblages previously documented both on Baffin Island and on the Ungava Peninsula of northern Quebec, and will be utilized to compare, and improve on, existing regional tectonic models.
Summary(Plain Language Summary, not published)
In 2014, the topographically rugged Meta Incognita Peninsula (Baffin Island) was successfully mapped. The objective was to improve the geological knowledge and document the economic potential of the greater Iqaluit area. Field observations established the distribution of sedimentary rocks that can be correlated with rock formations in the vicinity of Kimmirut. A suite of magmatic sheets (sills) was documented and will be the focus of further study. These are of potential economic importance as they contain metallic minerals (sulphides), and their occurrence could indicate the presence of economic metal concentrations. Four rock deformation and two thermal events were recognized. Such events can be correlated with similar ones that took place 1.8 billion years ago and have been previously documented both elsewhere on Baffin Island and on the Ungava Peninsula of northern Quebec. These results will be used to compare and improve models showing the ancient geological evolution of Nunavut.
GEOSCAN ID296112