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TitleOutcropping and remotely predicted lineaments, faults, fractures, and dykes in the Kiggavik uranium camp, Nunavut
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AuthorAnand, A; Jefferson, C W
SourceGeological Survey of Canada, Open File 7896, 2017, 8 pages (1 sheet), https://doi.org/10.4095/302777
Year2017
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is related to Anand, A; Jefferson, C W; (2017). Reactivated fault systems and their effects on outcrop patterns of thin-skinned early thrust imbrications in the Kiggavik uranium camp, Nunavut, Geological Survey of Canada, Open File 7895
File formatreadme
File formatpdf; rtf
ProvinceNunavut
NTS66A/03; 66A/04; 66A/05; 66A/06; 66A/07; 66A/10; 66A/11; 66A/12; 66B/01; 66B/02; 66B/07; 66B/08; 66B/09
AreaJudge Sissons Lake; Siamese Lake; Square Lake; Schultz Lake; Andrew Lake; Unconformity Lake
Lat/Long WENS -99.0000 -96.7500 64.8333 64.1667
Subjectseconomic geology; structural geology; tectonics; geophysics; mineral deposits; uranium; unconformity-type deposit; ore mineral genesis; lineaments; geophysical surveys; magnetic surveys; aeromagnetic surveys; demagnetization; remote sensing; LANDSAT; satellite imagery; photogrammetric techniques; airphoto interpretation; geological history; tectonic history; basin evolution; faulting; displacement; metamorphism; magmatism; deformation; structural analyses; structural features; faults; fractures; shear zones; foliation; imbrication; hydrothermal systems; fluid flow; shear stress; stress analyses; stress orientation; shear fractures; models; bedding planes; dykes; trend surface analyses; unconformities; discontinuities; iron formations; Archean; Kiggavik uranium camp; Thelon Basin; Thelon Fault Zone; Judge Sissons Fault Zone; Schultz Lake Intrusive Complex (SLIC); Andrew Lake Fault; Pukiq Lake Formation; Snow Island Suite; Ketyet River Group; Pipedream Assemblage; Woodburn Lake Group; Granite Thrust; Barrensland Group; Thelon Formation; Kivalliq Igneous Suite; McRae Lake Diabase; Thelon River Diabase; Nueltin Granite; Wharton Ggroup; Amarook Formation; Pitz Formation; Hudson Suite; Hudson Granite Suite; Martell Syenite; Judge Sissons Pluton; Marjorie Hills Assemblage; Amaruulik Assembalge; Half Way Hills Assemblavge; Mackenzie Igneous Event; Mackenzie Dyke Swarm; Ridge Fault; Pump Lake Fault; Skinny Lake Gorst; Long Lake Horst; fault reactivation; Riedel shear stress models; dyke swarms; banded iron formations (BIF); Phanerozoic; Paleozoic; Ordovician; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; geochronological charts; geophysical images; rose diagrams; photographs; satellite images; aerial photographs
ProgramSouth Rae Province Bedrock/Surficial geology, GEM2: Geo-mapping for Energy and Minerals
Image
Released2017 07 17
AbstractReactivated faults and their intersections are key exploration criteria for unconformity associated uranium (U) deposits. This poster shows how lineament data were generated and compiled over the Kiggavik uranium (U) camp, Nunavut, as part of a larger goal to understand fault reactivation in and around the northeastern Thelon Basin. The remote predictive maps presented here show lineaments at various scales, from regional scale through to camp scale to highly detailed. We show how the fractal range of lineament scales can be connected to and calibrated from detailed outcrop exposures. Lineaments were added to the compilation based on single prominent, or two or more moderate but coincident, straight features and/or offsets of other linear features, such as: broad to narrow demagnetized zones, stepped changes from higher to lower aeromagnetic intensity, linear magnetic highs associated with dykes filling these faults, straight sections of streams, lake-shores and swamps, linear steps in elevation, and geological contacts. The orientations of parallel swarms of lineaments are used to assign lineaments to classes of structures consistent with Riedel shear stress models. The lineaments are interpreted as faults, fractures and shear zones that resulted from a long, episodic Proterozoic deformation history, presented herein abbreviated form. The structural geological rationales for linking the stress models to successive tectonic events are developed with outcrop examples in the simultaneously released Open File 7895. Note: References cited in poster are located in accompanying digital file.
Summary(Plain Language Summary, not published)
Faults & fractures coincide with linear surface depressions or bluffs, dykes, demagnetized zones +/- magnetic boundaries. Detailed RPM correlated lineaments with outcrop structures in the Kiggavik U camp under the GEM Program. Linear structures developed & were reactivated during one or more successive deformations: DP1 - <1.95 to >1.9 2 Ga ductile deformation with low-angle folding and thrusting; DP2 - < 1.84 to > 1.83 Ga ductile to brittle, high-angle folding, thrusting & trans-extension; DP3 - ~1.83 to >1.81 trans-extensional, low angle folding, detachment/reactivated faults, intrusive event, & trans-extension; DP4 - transpression & extension, dextral dip-slip faults, volcanism, dykes, & silicification; & DP5-6 - post-volcanic erosion, weathering, repeated extension & differential subsidence, dextral dip-slip faults, dykes, desilicification & demagnetization. Fault chronology helps understand which linear features and alterations were temporally related to U mineralization.
GEOSCAN ID302777