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• W2184039327 abstract "Detailed field work conducted in the Dunnage zone of the Quebec Appalachians, is herein combined with 40 Ar/ 39 Ar dating on a series of ophiolitic massifs, crosscutting granites, and associated metamorphic rocks occurring along the Baie Verte–Brompton line, the Taconian suture between Laurentia and Lower Paleozoic peri-Laurentian oceanic terranes. Studied massifs are the Lac-Brompton ophiolite and the Rivière-des-Plante Ultramafic Complex in southern Quebec, and the Nadeau Ophiolitic Mélange in the Gaspé Peninsula. Our work suggests that these massifs form remnants of eroded ophiolitic nappes, which are unconformably overlain by the Saint-Daniel and Rivière-Port-Daniel mélanges, and correlate with the Thetford-Mines and Mont-Albert ophiolitic complexes. Our 40 Ar/ 39 Ar data and compiled regional age constraints indicate that ophiolite obduction was diachronous along the strike of the orogen. The timing of obduction and mélange formation varies according to the irregular geometry of the Early Paleozoic Laurentian margin, with earlier collision occurring along, or at the margins of promontories. Obduction was initiated with the formation of infraophiolitic metamorphic soles between ca. 479 and 472 Ma in southern Quebec and the Nadeau Ophiolitic Mélange, and possibly as late as ca. 470–466 Ma for the Mont-Albert Complex. These sole rocks were later exhumed and translated onto the Laurentian margin with the overlying ophiolites between 475 and 460–457 Ma. The uplifting and erosion of the orogenic wedge during the waning stages of obduction, has resulted in the sedimentation of olistostromal mélanges and onlapping flysch units above the ophiolitic nappes, as well as foredeep flysch successions during the latest Arenig(?) to earliest Caradoc." @default.
• W2184039327 created "2016-06-24" @default.
• W2184039327 creator A5000118437 @default.
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• W2184039327 creator A5059359463 @default.
• W2184039327 creator A5070715249 @default.
• W2184039327 date "2012-01-01" @default.
• W2184039327 modified "2023-10-13" @default.
• W2184039327 title "Ophiolite obduction in the Quebec Appalachians, Canada — ⁴⁰Ar/³⁹Ar age constraints and evidence for syn-tectonic erosion and sedimentation¹Geological Survey of Canada Contribution 20100430.²GEOTOP (Centre de recherche en géochimie et géodynamique) Contribution 2011-0002.³This article is one of a series of papers published in this <i>CJES Special Issue: In honour of Ward Neale</i> on the theme of Appalachian and Grenvillian geology." @default.
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• W2184039327 doi "https://doi.org/10.1139/e11-037" @default.
• W2184039327 hasPublicationYear "2012" @default.
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