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TitleCalibration of Middle to Upper Jurassic palynostratigraphy with Boreal ammonite zonations in the Canadian Arctic
AuthorNguyen, A V; Galloway, J MORCID logo; Poulton, T P; Dutchak, A
SourceBulletin of Canadian Petroleum Geology vol. 68, no. 3, 2021 p. 65-90,
Alt SeriesNatural Resources Canada, Contribution Series 20200747
PublisherThe Canadian Society of Petroleum Geologists
Mediapaper; on-line; digital
File formatpdf
NTS38G; 38H; 48G; 48H; 58G; 58H; 68H; 68G; 78G; 78H; 88G; 88H; 89; 79; 69; 59; 49; 39; 560; 340; 120
Lat/Long WENS-120.0000 -60.0000 84.0000 75.0000
Subjectsenvironmental geology; fossil fuels; arctic geology; Paleogene; palynology; pollen; pollen analyses; paleoenvironment; temperature; biostratigraphy; Middle Jurassic; Sverdrup Basin; Paleozoic
Illustrationslocation maps; geological time charts; tables; figures; columnar sections
ProgramGEM2: Geo-mapping for Energy and Minerals TransGEM
Released2021 08 04
AbstractQuantitative palynostratigraphy of the Middle to Upper Jurassic strata of the Sverdrup Basin is used to calibrate palynomorph signatures to Boreal ammonite occur-rences to improve high-latitude chronostratigraphy and supplement a paucity of Upper Jurassic paleoclimatic data in Arctic Canada. Terrestrial palynological signatures of Middle and Upper Jurassic strata of the Sverdrup Basin, Arctic Canada, are assessed with associated Boreal ammonite occurrences to generate a multi-taxon biostratigraphic scheme to improve inter- and intra-basin correlations. Palynological analyses of two stratigraphic sections exposed on Axel Heiberg Island, Arctic Canada, generated a succession of six informal palynoassemblages related to closely co-occurring ammonite assemblages. The ammonite assemblages are a result of both endemic evolution of Boreal lineages within this relatively isolated Arctic basin (i.e. Middle and Upper Jurassic Cardioceratidae) and replacement at the superfamily level due to periodic incursions of southerly faunas into the basin. These migrations imply periods of connectivity with more southern basins that may be related to transgressive flooding, tectonic opening of north-south seaways and associated climate variation. Evidence for regional climate variation is supported by the taxonomic composition of terrestrial palynomorph groupings. Changes in the relative abundance of ecologically important spore and pollen taxa are consistent with a climatic shift from warm-temperate in the Late Toarcian-Early Bajocian to more arid and cooler conditions during the Middle Jurassic. Communities of Cupressaceae-Taxaceae and parent plants of Laricoidites magnus with an understory of ferns characterized the Late Toarcian-Early Bajocian, whereas the cooler conditions of the Middle Jurassic promoted expansion of coniferous plant communities in the hinterland. The latest Jurassic was characterized by the return of temperate conditions and Cupressaceae-Taxaceae conifer communities.
Summary(Plain Language Summary, not published)
Quantitative and statistical palynology was used to link palynomorph signatures to rare Boreal ammonite occurrences in Sverdrup Basin, Arctic Canada. This approach is designed to improve inter- and intra-basin stratigraphic correlation for Middle and Upper Jurassic rocks.

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