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

Hiroyoshi Sano, Tetsuji Onoue, Michael J. Orchard, Rossana Martini

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)113-130
Number of pages18
JournalFacies
Volume58
Issue number1
DOIs
Publication statusPublished - Jan 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geology
  • Stratigraphy
  • Palaeontology

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