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TitleThe ups and downs of the Canadian Shield: 1- preliminary results of apatite fission track analysis from Hudson Bay region
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AuthorPinet, N; Kohn, B P; Lavoie, D
SourceGeological Survey of Canada, Open File 8110, 2016, 59 pages, https://doi.org/10.4095/299248
Year2016
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is related to Pinet, N; (2018). The ups and downs of the Canadian Shield: 2- preliminary results of apatite fission-track analysis from a 3.6 km vertical profile, LaRonde mine, Quebec, Geological Survey of Canada, Open File 8385
File formatpdf
ProvinceManitoba; Ontario; Northern offshore region; Nunavut
NTS32L; 32M; 32N; 33D; 33E; 33L; 43B; 43G; 43H; 54K; 54L; 45; 46
AreaHudson Bay; Southampton Island; Churchill; Moose River; Hudson Strait
Lat/Long WENS -96.0000 -68.0000 71.0000 50.0000
Subjectsstructural geology; tectonics; igneous and metamorphic petrology; thermal history; thermal analyses; apatite; fission tracks; fission-track dates; sedimentary basins; basin analysis; basin evolution; sedimentary rocks; hydrocarbons; hydrocarbon potential; gas wells; tectonic environments; tectonic interpretations; tectonic setting; Hudson Platform; Moose River Basin; Foxe Basin; Hudson Bay Basin; Hudson Strait Basin; Paleozoic; Devonian; Silurian; Ordovician
Illustrationslocation maps; models; tables; plots
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramHudson/Ungava Hydrocarbon source rocks, GEM2: Geo-mapping for Energy and Minerals
Released2016 11 02
AbstractThe low-temperature (120-60°C) thermal history of seven samples from the Hudson Bay region has been investigated using apatite fission-track (AFT) analysis. Apatite grains from six Precambrian rock samples from the surface or the bottom of hydrocarbon-targeted wells and from one sample belonging to a thin Upper Ordovician sandstone unit at the base of the Paleozoic succession were analysed. All apatite fissiontrack (AFT) ages are younger than the age of their host rocks indicating that fission tracks experienced significant post-crystallisation or deposition annealing and samples were subjected to temperatures > 60°C. The track length distributions suggest slow cooling. AFT pooled ages range from 215.1 ± 15.0 to 462.7 ± 29.9 Ma. The sample from Akpatok Island, in Hudson Strait has the youngest AFT age, suggesting that the exhumation history of this area may be different from the Hudson Bay Basin.
Inverse modeling of AFT data provides an estimate of the maximum temperature experienced during the Paleozoic burial episode and, with much less accuracy, the timing of maximum heating. For the two wells that have both organic matter maturation and AFT data, the measured vitrinite equivalent value is higher than that calculated reflectance using AFT inverse modeling results. AFT results from the Hudson Bay region are broadly in agreement with those reported for the southern Canadian Shield. However, the available dataset is not sufficient to depict regional variations of maximum heating conditions, an issue that is critical for the hydrocarbon assessment of the area.
Summary(Plain Language Summary, not published)
The low-temperature (~60-120°C) thermal history of seven samples from the Hudson Bay region has been investigated using apatite fission- track (AFT) analysis. Inverse modeling of AFT data provides estimate of the maximum temperature experienced during the Paleozoic burial episode and, with much less accuracy, of the timing of maximum heating.
GEOSCAN ID299248