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Title

Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount: the Jesmond succession, Cache Creek Terrane, British Columbia, Canada

Authors
Sano, Hiroyoshi
Onoue, Tetsuji
Orchard, Michael J.
Published in Facies. 2012, vol. 58, no. 1, p. 113-130
Abstract The Jesmond succession of the Cache Creek Terrane in southern British Columbia records late Early Triassic peritidal carbonate sedimentation on a mudflat of abuildup 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.
Keywords Late Early TriassicPeritidal carbonatesSeamountCache Creek TerranePanthalassa OceanCanada
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Research group Sedimentology, Biostratigraphy and Micropaleontology
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SANO, Hiroyoshi et al. Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount: the Jesmond succession, Cache Creek Terrane, British Columbia, Canada. In: Facies, 2012, vol. 58, n° 1, p. 113-130. https://archive-ouverte.unige.ch/unige:18034

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Deposited on : 2012-01-10

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