The Cenomanian–Turonian boundary interval in the Western Canada Foreland Basin: Stratigraphy, geochemistry, geochronology and sea‐level changes recorded in expanded and condensed clastic successions
Rattachement africain : ca, gb, pl, nl, cz. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Abstract A 300 m thick section at Nini Hill in the proximal foredeep of the Western Canada Foreland Basin is dominated by shallow‐marine mudstone that spans the Cenomanian–Turonian boundary (CTB). The section preserves a 185 m thick record of OAE2, characterised by an ornate positive excursion in the organic carbon‐isotope profile. Osmium‐isotopes show the characteristic shift to unradiogenic ratios 21 m below the onset of OAE2. Carbon‐isotope events (CIE) at Nini Hill are correlated with both the Chalk reference section at Eastbourne, UK and the well‐dated SH#1 core in Utah, the latter permitting correlation to other sections in the southern USA. However, only the ~450 m thick, deep‐water CTB section in the Saku Formation, Japan, appears to match the CIE detail at Nini Hill. High‐resolution correlation utilising CIEs allows, for the first time, sea‐level changes, mapped in the poorly fossiliferous strata of Western Canada, to be correlated with coeval events in the USA and Europe. The globally‐recognised sub‐plenus unconformity that underlies OAE2 in many passive‐margin sections spanning the North Atlantic region is correlative with up to six high‐frequency sequences preserved in the highly expanded foredeep. Various studies have inferred sea‐level change of 10–40 m for this event, suggesting that thermo‐ and aquifer‐eustasy may have been supplemented by glacio‐eustasy. Other sea‐level changes of ~10–30 m recognised in Canada correlate with coeval events in the USA and Europe. Lower‐amplitude sea‐level cycles of ~5–10 m, form a persistent signal throughout the Canadian CTB interval. Strata thin dramatically from foredeep to forebulge due to condensation and lap out, hiatuses being represented by cryptic mud‐on‐mud disconformities. Without knowledge of physical stratigraphy, interpretation of carbon‐ and osmium‐isotope profiles in attenuated successions is prone to misinterpretation. Osmium data show that the influence of a large igneous province diminished markedly northward within the Western Interior Seaway.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- The Cenomanian–Turonian boundary interval in the Western Canada Foreland Basin: Stratigraphy, geochemistry, geochronology and sea‐level changes recorded in expanded and condensed clastic successions
- Date Crossref
- 04/08/2025
- Éditeur
- Wiley
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Western University pays non établi dans la noticeUniversité ou école supérieure
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Durham University Department of Earth Sciences pays non établi dans la noticeUniversité ou école supérieure
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University of Warsaw pays non établi dans la noticeUniversité ou école supérieure
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University of Toronto Jack Satterly Geochronology Laboratory pays non établi dans la noticeUniversité ou école supérieure
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Kingston University London Department of Geography pays non établi dans la noticeUniversité ou école supérieure
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Utrecht University Department of Earth Sciences pays non établi dans la noticeUniversité ou école supérieure
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Imperial Oil (Canada) pays non établi dans la noticeEntreprise
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Czech Academy of Sciences pays non établi dans la noticeOrganisme public
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Department of Earth Sciences The University of Western Ontario London Ontario Canada Department of Earth Sciences pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Geology pays non établi dans la noticeUniversité ou école supérieure
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Imperial Oil Limited Calgary Alberta Canada pays non établi dans la noticeInstitution
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Faculty of Science Charles University Prague Czech Republic Institute of Geophysics pays non établi dans la noticeUniversité ou école supérieure
Western University, Department of Earth Sciences — Durham University et University of Warsaw, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.