Strontium isotope ages of foraminifers from Early Miocene to Late Pliocene (Neogene) sequences (21.2-3.4 Ma) are reported for the first time from the Queen Charlotte Basin (QCB) in Queen Charlotte Sound, offshore British Columbia. These ages, together with a revised foraminifer biostratigraphy and log data from two offshore wells, provide a high-resolution chronostratigraphy for the southern part of the QCB. The data show thick 1717-2636 m Miocene sequences overlain by much thinner Pliocene and younger units (<240 m). Assessments of foraminifer biofacies indicate common transported neritic and shelf faunas into slope or bathyal environments where changes in basin water depths indicate significant deformation and erosion.
Résumé : Des datations isotopiques (strontium) de foraminifères dans des successions (21,2 à 3,4 Ma) du Miocène précoce auPliocène tardif (Néogène) sont rapportées pour la première fois du bassin de la Reine-Charlotte dans le détroit de la ReineCharlotte, au large de la Colombie Britannique. Ces âges, joints à une biostratigraphie des foraminifères révisée et des données de diagraphies de deux puits au large, fournissent une chronostratigraphie à haute définition pour la partie sud du bassin de la Reine-Charlotte.
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