|Title||Report of activities for the 2015 bedrock component of the GEM Southern Core Zone activity, northern Quebec and Labrador|
|Author||Sanborn-Barrie, M; Rayner, N M; Lion, A|
|Source||Geological Survey of Canada, Open File 7952, 2015, 18 pages, https://doi.org/10.4095/297271 (Open Access)|
|Publisher||Natural Resources Canada|
|Province||Quebec; Newfoundland and Labrador|
|Area||Rivière de Pas; Rivière George; Smallwood Reservoir; Woods Lake; Lac Résolution|
|Lat/Long WENS||-66.0000 -64.0000 56.0000 54.0000|
|Subjects||stratigraphy; structural geology; economic geology; geochemistry; geochronology; tectonics; field work; bedrock geology; sampling methods; Archean; lithology; bedrock geology; tectonic interpretations;
tectonic environments; hydroelectric potential; metallogeny; glacial deposits; tills; sediment dispersal; lake sediment geochemistry; New Quebec Orogen; Laporte domain; Lobstick Supracrustal sequence; Lac Zeni complex; Ntshuku - Hutte Sauvage;
Mistinibi-Raude; indicator minerals; Precambrian; Proterozoic|
|Illustrations||location maps; photographs|
|Program||Hudson/Ungava, Northeastern Quebec-Labrador, surficial geology, GEM2: Geo-mapping for Energy and Minerals|
|Released||2015 11 20|
The GEM2 Southern Core Zone activity is undertaking surficial and bedrock mapping and related geochemical and mineralogical studies in northern Quebec and Labrador (McClenaghan et
al., 2014, 2015). These activities are aligned with the objectives and goals of GEM to increase economic prosperity of northern communities and Canada through stable, long-term investment in northern mineral exploration and development. Bedrock
mapping and mineral resource exploration in northern Quebec and Labrador is challenging because bedrock is largely covered by unconsolidated surficial sediments deposited by a complex sequence of glacial events influenced by a migrating ice divide.
Significant parts of northern Quebec and Labrador have no surficial geology maps, and little geochemical or indicator mineral data from the glacial sediment (till). This lack of surficial geological information results in poorly understood till
thickness, glacial history, and dispersal mechanisms and patterns, which collectively hinder mineral exploration using till prospecting methods.
In order to address this challenge, new surficial mapping, indicator mineral, and geochemical surveys
in association with new bedrock mapping are taking place across NTS sheets 23P and 23I, to generate new regional geoscience data and knowledge that will be used to increase natural resource exploration successes and reduce risks to the mineral
exploration sector. The poorly understood bedrock geology and mineral potential of the southern Core Zone will be addressed by 3 main activities: 1) regional surficial mapping and till geochemical/mineralogical sampling; 2) compilation of lake
sediment geochemical data across both Quebec and Labrador, to generate a set of coherent geochemical maps for the region; and 3) detailed bedrock mapping and geochronology in targeted areas.
|Summary||(Plain Language Summary, not published)|
Re-evaluating the prospectivity of the southern Core Zone, an under-explored, till-covered region that straddles the Quebec¿Labrador boundary east of
Schefferville, is taking place through integrated surficial studies and bedrock mapping. This report focuses on the bedrock mapping undertaken in August 2015. Bedrock mapping is directly supporting surficial activities through identification of the
sources of diagnostic lithologies occurring within till, so that dispersal directions and distances can be quantified. In addition, bedrock studies are focused on establishing the time at which major rock units were formed and deformed, with the goal
of developing a calibrated chronology for the region, with which to test long-held stratigraphic correlations and refine tectonic models. New data will highlight areas of increased mineral prospectivity, allow a more tractable link between metal
contents in glacial till and source rocks, and provide a more robust tectonostratigraphic and magmatic context in which to undertake mineral exploration.