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TitleBedrock mapping of eastern Meta Incognita Peninsula, southern Baffin Island, Nunavut
AuthorSt-Onge, M R; Rayner, N M; Steenkamp, H M; Skipton, D R
SourceCanada-Nunavut Geoscience Office, Summary of Activities 2014, 2015 p. 105-118
Year2015
Alt SeriesEarth Sciences Sector, Contribution Series 20140276
PublisherCanada-Nunavut Geoscience Office
Documentserial
Lang.English
Mediapaper
File formatpdf
ProvinceNunavut
NTS25F/16; 25G/13; 25G/14; 25G/15; 25G/16; 25H13; 25I/04; 25I/05; 25I/12; 25I/13; 25J; 25K/01; 25K/08; 25K/09; 25K/16; 25N/01; 25O/01; 25O/02; 25O/03; 25O/04; 25P/04
AreaMeta Incognita Peninsula; Baffin Island
Lat/Long WENS -68.5000 -65.5000 63.2500 61.7500
Subjectseconomic geology; general geology; geochemistry; igneous and metamorphic petrology; mineralogy; structural geology; tectonics; bedrock geology; metasedimentary rocks; metavolcanic rocks; sills; ultramafic metavolcanics; mafic metavolcanic rocks; plutonic rocks; metamorphism; iron concretions; Proterozoic
Illustrationslocation maps; geologic sketch maps; photographs; sketch maps
ProgramBaffin Bedrock Mapping, GEM2: Geo-mapping for Energy and Minerals
LinksOnline-Enligne
AbstractThis paper summarizes the field observations and initial interpretations following five weeks of regional and targeted bedrockmapping on easternMeta Incognita Peninsula,Baffin Island, Nunavut. Under the Geo-mapping for Energy andMinerals (GEM) Program, this areawas 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 ofmetasedimentary units comprising quartzite,marble, psammite, pelite and semipelite, all of which can be correlatedwith the contiguousmiddle Paleoproterozoic Lake Harbour Group in the type area north of Kimmirut. The full range of siliciclastic and minor carbonate rock types can be traced to the easternmost tip of Meta Incognita Peninsula. The spatial distribution of a suite of layered mafic to ultramafic sills intrusive into the sedimentary strata was also documented and will be the focus of further study. Layering in the sills was observed on the centimetre to metre scale, with many bodies containing disseminated sulphide, some associated with ferricrete. The distribution and eastern limit of high-grade felsic andmafic 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 upon, existing regional tectonic models.
Summary(Plain Language Summary, not published)
During the summer of 2014, five weeks of geological mapping were completed on the topographically rugged eastern Meta Incognita Peninsula, Baffin Island, Nunavut. The objective was to improve the geological knowledge and document the economic potential of the greater Iqaluit area south of Frobisher Bay. Participants included the GSC, the Canada-Nunavut Geoscience Office, AANDC Nunavut Arctic College, University of Ottawa and Carleton University. Field observations constrained the distribution of sedimentary rocks, which can be correlated with rock formations in the vicinity of Kimmirut. A suite of chocolate brown to black sheets was also documented and will be the focus of further study. These are of potential economic interest as they were observed to contain metallic minerals (sulphides), and were often associated with rusty zones (gossans). Four rock deformation events and two crustal heating events that took place 1.8 billion years ago were recognized and will be utilized to compare and improve current models for the ancient geological evolution of Nunavut.
GEOSCAN ID295484