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首页> 外文期刊>Facies >Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount: the Jesmond succession, Cache Creek Terrane, British Columbia, Canada
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Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount: the Jesmond succession, Cache Creek Terrane, British Columbia, Canada

机译：Panthalassan海山上的三叠纪早期碳酸盐岩沉积：Jesmond演替，Cache Creek Terrane，不列颠哥伦比亚省，加拿大

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摘要

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.
机译：不列颠哥伦比亚省南部的Cache Creek Terrane的Jesmond演替记录了在Panthalassan海山上堆积物的泥滩上早期的三叠纪晚期碳酸盐沉积。牙形石和有孔虫生物地层学认为该演替是最上层的史密斯阶至中度斯巴第阶。研究部分（约91 m厚）以细粒碳酸盐为主，并组织成至少12个浅向上的旋回，每个旋回由浅潮下相和上覆潮间相组成。前者包括胶质和骨架的石灰岩，扁卵石砾岩，层间质黏结石和鲕粒型花岗岩，而后者则主要由白云岩组成。骨骼碎屑的稀缺，微辉石的盛行以及扁平卵石砾岩相的间歇性插入，意味着泥滩环境条件恶劣。研究部分还记录了靠近史密斯安-喀尔巴阡山脉边界的海平面迅速下降，然后在早期的中-喀尔巴阡海平面逐渐上升。

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