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TitreEarly Triassic peritidal carbonate sedimentation on a Panthalassan seamount: The Jesmond succession, Cache Creek Terrane, British Columbia, Canada
AuteurSano, H; Onoue, T; Orchard, M J; Martini, R
SourceFacies vol. 58, 2012 p. 113-130, https://doi.org/10.1007/s10347-011-0270-4
Année2012
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100491
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1007/s10347-011-0270-4
Mediapapier; en ligne; numérique
Formatspdf
ProvinceColombie-Britannique
SNRC92I/13; 92I/14; 92P/03; 92P/04; 92P/05; 92P/06
Lat/Long OENS-122.0000 -121.0000 51.5000 50.7500
SujetsTrias inférieur; roches sédimentaires; calcaires; dolomies; sedimentation; carbonates; monts sous-marins; biostratigraphie; calcaires à debris jointifs; fossiles; morphologie des fossiles; descriptions des fossiles; faciès; descriptions de faciès; Terrane de Cache Creek ; Foraminfère; sédimentologie; stratigraphie; Mésozoïque; Trias
Illustrationslocation maps; photomicrographs; stratigraphic columns; tables
ProgrammeGisements polymétalliques - nord-ouest de la Cordillère canadienne (Yukon et Colombie-Britannique), GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
The Jesmond succession of the Cache Creek Terrane in southern British Columbia records late Early Triassic peritidal carbonate sedimentation on a mudflat of a buildup resting upon a Panthalassan seamount. Conodont and foraminiferal biostratigraphy dates the succession as the uppermost Smithian to mid-Spathian. The study section (ca. 91 m thick) is dominated by fine-grained carbonates and organized into at least 12 shallowing-upwards cycles, each consisting of shallow subtidal facies and overlying intertidal facies. The former includes peloidal and skeletal limestones, flat-pebble conglomerates, stromatolitic bindstones, and oolitic grainstone, whereas the latter consists mainly of dolomicrite. The scarcity of skeletal debris, prevalence of microbialite, and intermittent intercalation of flat-pebble conglomerate facies imply environmentally harsh conditions in the mudflat. The study section also records a rapid sea-level fall near the Smithian-Spathian boundary followed by a gradual sea-level rise in the early to mid-Spathian.
GEOSCAN ID288097