TY - JOUR
T1 - Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount
T2 - The Jesmond succession, Cache Creek Terrane, British Columbia, Canada
AU - Sano, Hiroyoshi
AU - Onoue, Tetsuji
AU - Orchard, Michael J.
AU - Martini, Rossana
N1 - Funding Information:
Acknowledgments The authors thank Thomas J. Algeo, who kindly permitted us to refer to his unpublished data on the total organic carbon and total sulfur contents in the Jesmond carbonate rocks. The first author expresses his sincere thanks to the Canadian Geoscience Council and Japanese Society for the Promotion of Science (JSPS) for their financial support for fieldwork in 2004 and 2005, respectively. JSPS Grant-in-Aid for Scientific Research also supported part of this research to HS (No. 17340132). M.J. Orchard’s involvement represents a contribution to the EDGES project, ESS Contribution number 20100491. Research by RM was supported by the Swiss National Science Foundation. We thank Nereo Preto and Elias Samankassou for their constructive reviews of the manuscript.
PY - 2012/1
Y1 - 2012/1
N2 - 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.
AB - 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.
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U2 - 10.1007/s10347-011-0270-4
DO - 10.1007/s10347-011-0270-4
M3 - Article
AN - SCOPUS:84855318121
VL - 58
SP - 113
EP - 130
JO - Facies
JF - Facies
SN - 0172-9179
IS - 1
ER -