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The Record of Neoproterozoic Earth System Evolution in the Yukon, Northern Canadian Cordillera


IPGP - Îlot Cuvier


Séminaires Géochimie

Salle 310

Galen Halverson

McGill University

Integrated stratigraphic, geochronological, geochemical, and structural data from the Neoproterozoic inliers of the western Yukon, northern Canadian Cordillera, provide important new constraints on the tectonic evolution of northwestern Laurentia and evolution of the Earth system leading into the Cryogenian glacial epoch. New radiometric ages and stratigraphic mapping provide evidence for a multi-stage breakup of northwestern Laurentia from the Rodinia supercontinent beginning ca. 850 Ma and constraint the onset of the global Bitter Springs carbon isotope anomaly to ca. 810 Ma. New U-Pb zircon ages and geochemistry on the Mount Harper Volcanics and related basalt flows and dikes indicate an intimate connection between emplacement of the c. 720 Ma Franklin Igneous Province and onset of the Rapitan (Sturtian?) global glaciation. Séminaire de Géochimie