GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreSedimentological and geochemical basin analysis of the Paleoproterozoic Penrhyn and Piling groups of Arctic Canada
AuteurPartin, C A; Bekker, A; Corrigan, D; Modeland, S; Francis, D; Davis, D W
SourcePrecambrian Research vol. 251, 2014 p. 80-101, https://doi.org/10.1016/j.precamres.2014.06.010
Année2014
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150086
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.precamres.2014.06.010
Mediapapier; en ligne; numérique
Formatshtml; pdf
ProvinceNunavut
SNRC27B; 27C; 37A; 37D; 46I; 46J; 46O; 46P; 47A; 47B; 47C; 47D
Lat/Long OENS-88.0000 -80.0000 70.0000 66.0000
Lat/Long OENS-76.0000 -70.0000 70.0000 68.0000
Sujetsanalyses stratigraphiques; corrélations stratigraphiques; modèles stratigraphiques; datations au uranium-plomb; datations au zircon; datations au neodymium-samarium; isotopes de carbone; géochimie du carbone; roches volcaniques; basaltes; filons-couches; cadre tectonique; origine; analyses du bassin; établissement de modèles; Craton de Rae ; Province de Churchill ; Groupe de Piling ; Formation de Bravo Lake ; Formation de Longstaff Bluff ; Formation de Flint Lake ; stratigraphie; géochronologie; géochimie; tectonique; Protérozoïque; Précambrien
Illustrationsgeological sketch maps; geochemical analyses
ProgrammeGisements polymétalliques - Presqu'île Melville (Nunavut), GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Paleoproterozoic metasedimentary successions on the western Churchill Province record a history of regional tectonic events spanning the breakup and amalgamation of supercontinents. Metasedimentary successions in the northeastern part of the Trans-Hudson orogeny, including the Penrhyn and Piling groups of Melville Peninsula and Baffin Island, respectively, have been understudied with respect to their basin evolution records. We present new sedimentological, geochemical, and geochronological data for the Penrhyn and Piling groups that record deposition on the Rae craton. New detrital zircon U-Pb age data indicate that deposition of the Penrhyn Group started after ?1897 Ma and post-dates deposition of most of the Piling Group. The new maximum age constraints and stratigraphy of the Penrhyn Group do not support previous lithostratigraphic correlation with the Piling Group. Deposition of the lower Piling Group likely occurred in an epicontinental basin setting. The occurrence of detritus from the Meta Incognita microcontinent in the upper Piling Group (Bravo Lake and Longstaff Bluff formations) is interpreted to signal the onset of foreland basin deposition. The details of sedimentation in the Piling foreland basin provide an additional constraint to discerning the polarity of subduction between the Rae craton and Meta Incognita microcontinent that closed the Piling basin. We conclude that the Piling foreland system shows characteristics of a pro-foreland basin, implying that the Rae craton was the lower plate in the collision with the Meta Incognita microcontinent. Finally, with new stratigraphic and detrital zircon geochronological data for the Penrhyn and Piling groups, we provide a comparison with other sedimentary successions on the Rae craton whose histories were influenced by similar regional tectonic events.
GEOSCAN ID296591