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首页> 外文期刊>Stratigraphy >Stratigraphic review of the Cambrian-Lower Ordovician volcanosedimentary complexes from the northern Montagne Noire, France
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Stratigraphic review of the Cambrian-Lower Ordovician volcanosedimentary complexes from the northern Montagne Noire, France

机译：法国北部Montagne Noire的寒武纪-下奥陶纪火山岩沉积复合物的地层学审查

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摘要

The northern Montagne Noire possesses one of the most complete Cambrian-Lower Ordovician successions of West Gondwana. The strata are poorly fossiliferous, metamorphized and disturbed by Variscan tectonism, and their stratigraphic nomenclature dramatically multiplied by the designation of numerous informal units exclusively identifiable in their own Variscan thrust slices and nappes. This paper presents an updated revision of lithostratigraphic units and volcanic complexes. Special attention is given to crosscut-ting relationships of the latter and the setting and age of fossiliferous phosphorites, such as the Watsonella crosbyi-bearing phosphatic limestones of the Marcou Formation. This mollusc is key to defining in the next future the Global Standard Cambrian (Terreneuvian) Stagel /Stage2 boundary. The absence of Cadomian tectono-thermal events is documented by meso- and microstructural and metamor-phic analyses.
机译：北部的Montagne Noire拥有西贡多瓦纳最完整的寒武纪-下奥陶纪演替之一。地层化石性差，变质，并受瓦里斯卡构造作用干扰，其地层命名大大增加，而无数个非正式单位的名称则专门由其自己的瓦里斯坎逆冲断层和推覆带确定。本文介绍了岩石地层学单位和火山综合体的最新修订版。特别要注意后者的横切关系以及化石性磷矿的环境和年龄，例如马可组中的含屈臣氏带磷的石灰石。该软体动物是在未来定义全球标准寒武纪（Terreneuvian）Stagel / Stage2边界的关键。中尺度和微观结构以及变质分析表明，没有发生卡多姆构造热事件。

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