Résumés
Abstract
Triassic successions of the present-day Arctic contain abundant and diverse assemblages of nonmarine palynomorphs that have provided important biostratigraphic information. Dinoflagellate cyst are biostratigraphically useful in marine intervals in the Upper Triassic. Based on published records, we present a compilation of 78 last occurrences (LOs), first occurrences (FOs), and some abundance events that are anticipated to have correlation potential in the Arctic region. Palynological work has been carried out in many Arctic areas, with extensive palynological research published on the Triassic successions of the Norwegian Barents Sea and Svalbard. An updated, recent palynological zonation scheme exists for that region, integrating previous schemes and illustrating the chronostratigraphic value of palynology in the Triassic. For the Lower and Middle Triassic, good ammonoid control ties the palynological zones to the chronostratigraphic scale. Independent control is sparse, and resolution is lower in the Upper Triassic, so that palynology is commonly the only biostratigraphic discipline available for chronostratigraphic dating and correlation.
Résumé
Les successions triassiques de l’Arctique actuel abritent des assemblages abondants et diversifiés de palynomorphes terrestres qui ont livré des renseignements biostratigraphiques précieux. Les kystes dinoflagellés sont utiles sur le plan biostratigraphique dans les intervalles marins du Trias supérieur. Nous présentons, à partir de documents déjà publiés, une compilation de 78 dernières récurrences (DO) et premières récurrences (PO) ainsi que de certains phénomènes d’abondance entre lesquels nous anticipons des possibilités de corrélation dans la région arctique. Des travaux palynologiques ont été réalisés dans de nombreux secteurs de l’Arctique et des recherches palynologiques poussées ont été publiées sur la succession triassique de la zone norvégienne de la mer de Barents et Svalbard. Il existe pour cette région un schèma de zonation palynologique récent, mis à jour, qui intègre des schèmas antérieurs et illustre la valeur chronostratigraphique de la palynologie au cours du Trias. Dans le cas du Trias inférieur et moyen, une présence révélatrice d’ammonites relie les zones palynologiques à l’échelle chronostratigraphique. Le contrôle indépendant possible est clairsemé et la résolution est inférieure dans le cas du Trias supérieur, de sorte que la palynologie constitue communément la seule discipline biostratigraphique dont on dispose pour la datation et la corrélation chronostratigraphique.
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