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首页> 外文期刊>Geosciences >The Role of Regional and Local Structure in a Late Ordovician (Edenian) Foreland Platform-to-Basin Succession Inboard of the Taconic Orogen, Central Canada
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The Role of Regional and Local Structure in a Late Ordovician (Edenian) Foreland Platform-to-Basin Succession Inboard of the Taconic Orogen, Central Canada

机译：区域和局部结构在加拿大中部塔科尼克造山带晚期奥陶纪（爱丁尼亚）前陆平台台盆盆地内演中的作用

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The Upper Ordovician (Edenian) Lindsay Formation of the Ottawa Embayment represents the final stage of carbonate platform development in the Taconic foreland periphery inboard of the northern Appalachian orogen. The succession overlies a narrow (~60 km) axis of a Neoproterozoic Laurentian rift extending across the Grenville orogen. The Lindsay Formation consists of a lower heavily bioturbated skeletal limestone that represents a warm-water shoal facies following an underlying outer ramp stratigraphy, and an upper division of renewed deep-water deposition with organic-rich shale and fossiliferous lime mudstone. Pyritic deep-water black shale of the westerly advancing Taconic foreland basin disconformably overlies this platform succession. Stratigraphic correlation through the central embayment identifies likely synsedimentary faults and seaward-directed erosion bounding the Lindsay Formation in a region of older Ordovician faults and a change in the lithotectonic character of the crystalline basement. The Late Ordovician shallowing and localization of structural/erosional features are interpreted to record a structural hinge: a local accommodation to, first, foreland periphery uplift, then rapid subsidence related to westerly diachronous foreland subsidence through the platform interior. Spatial association of structures of differing ages suggests that reactivation of inherited weakened crust influenced Late Ordovician sedimentary patterns.
机译：渥太华河上游的奥陶纪（爱德华）林赛组代表了北阿巴拉契亚造山带内侧塔科尼克前陆外围碳酸盐台地发育的最后阶段。演替过程覆盖了新元古代劳伦式裂谷的狭窄轴（约60公里），该裂谷横跨格伦维尔造山带。 Lindsay地层由下部严重生物扰动的骨架石灰岩组成，代表下伏的外部斜坡地层之后的温水浅滩相，以及由富含有机质的页岩和化石石灰岩组成的深水沉积的上部划分。塔西尼克前陆盆地西风推进的黄铁矿深水黑色页岩不合理地覆盖了该台地序列。通过中央包裹体的地层相关性确定了较老的奥陶纪断层区域中可能的同沉积断层和向海侵蚀，界定了林赛组的边界，以及该结晶基底的岩石构造特征发生了变化。奥陶纪晚期的浅化和结构/侵蚀特征的局部化被解释为记录了一个结构性的铰链：局部适应，首先是前陆外围隆起，然后是通过平台内部与西风前陆沉降有关的快速沉降。不同年龄结构的空间联系表明，继承的弱化地壳的再活化影响了奥陶纪晚期的沉积模式。

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