期刊
FACIES
卷 58, 期 1, 页码 113-130出版社
SPRINGER
DOI: 10.1007/s10347-011-0270-4
关键词
Late Early Triassic; Peritidal carbonates; Seamount; Cache Creek Terrane Panthalassa Ocean; Canada
资金
- Canadian Geoscience Council
- Japanese Society for the Promotion of Science (JSPS) [17340132]
- Swiss National Science Foundation
- Grants-in-Aid for Scientific Research [17340132, 23540552] Funding Source: KAKEN
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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