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GEOREF RECORD

Ordovician arc collision and foredeep evolution in the Gaspe Peninsula, Quebec; the Taconic Orogeny in Canada and its bearing on the Grampian Orogeny in Scotland

A. R. Prave, L. G. Kessler, M. Malo, W. V. Bloechl and J. Riva
Ordovician arc collision and foredeep evolution in the Gaspe Peninsula, Quebec; the Taconic Orogeny in Canada and its bearing on the Grampian Orogeny in Scotland
Journal of the Geological Society of London (March 2000) 157, Part 2: 393-400

Abstract

The Middle to Upper Ordovician Deslandes, Cloridorme and Garin Formations in the eastern Gaspe Peninsula, Quebec, are some of the most extensively exposed foredeep successions along the northern Appalachian portion of the Taconic-Caledonian orogen. Their depositional and biostratigraphic frameworks (N. gracilis to C. spiniferus Zones, approximate correlatives to the N. gracilis to D. clingani British Zones) indicate that foredeep evolution spanned c. 10 Ma and was essentially synchronous with the convergence and accretion of the Popelogan arc to the Laurentian margin during the Caradoc (c. 458-449 Ma). These results, when combined with metamorphic and radiometric age data synthesized from across the Laurentian segments of the northern Appalachian and northwestern Ireland Taconic-Caledonian orogen, further substantiate that orogenesis consisted of several short-lived (c. 10-20 Ma) deformational episodes confined to Arenig through Ashgill time (c. 485-440 Ma). This indicates that the total duration of orogeny, as recorded by arc magmatism, metamorphism and Laurentian foredeep development, spanned no more than c. 45 Ma. In that the Scottish Caledonides are a consanguineous part of this orogen, their tectonostratigraphic evolution, i.e., Grampian Orogeny, should be similar. Accordingly, the results detailed above are geodynamically compatible with and thereby support tectonic models that define the Grampian Orogeny in Scotland as a mostly Early to Mid-Ordovician (c. 480-460 Ma) tectonic episode of short, rather than long duration.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 157, Part 2
Title: Ordovician arc collision and foredeep evolution in the Gaspe Peninsula, Quebec; the Taconic Orogeny in Canada and its bearing on the Grampian Orogeny in Scotland
Affiliation: University of Saint Andrews, Crustal Geodynamics Group, Saint Andrews, United Kingdom
Pages: 393-400
Published: 200003
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 69
Accession Number: 2000-027024
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N47°49'60" - N49°15'00", W68°00'00" - W64°15'00"
N54°40'00" - N61°00'00", W08°30'00" - W00°45'00"
Secondary Affiliation: Marathon Oil Company, Houston, TX, USA, United StatesINRS-Georessources, Sainte-Foy, PQ, CAN, Canada
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200009
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