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Geosciences 2013, 3(2), 216-239; doi:10.3390/geosciences3020216

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

Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, 2160 Herzberg Laboratories, Ottawa, ON K1S 5B6, Canada
Crow Creek Road, Bettendorf, IA 52722, USA
Author to whom correspondence should be addressed.
Received: 15 March 2013 / Revised: 26 April 2013 / Accepted: 9 May 2013 / Published: 21 May 2013
(This article belongs to the Special Issue Sedimentary Basins and Orogenic Belts)
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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.
Keywords: carbonate platform-to-basin transition; Taconic foreland; inherited structure carbonate platform-to-basin transition; Taconic foreland; inherited structure

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Gbadeyan, R.; Dix, G.R. The Role of Regional and Local Structure in a Late Ordovician (Edenian) Foreland Platform-to-Basin Succession Inboard of the Taconic Orogen, Central Canada. Geosciences 2013, 3, 216-239.

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