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Geomorphology of an Exhumed Carboniferous Paleosurface

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Geomorphology of an Exhumed Carboniferous Paleosurface Document generated on 10/01/2021 10:51 p.m. Géographie physique et Quaternaire Geomorphology of an Exhumed Carboniferous Paleosurface in the Southern Gaspé Peninsula, Québec: Paleoenvironmental and Tectonic Implications Géomorphologie d’une paléosurface exhumée dans le sud de la Gaspésie, Québec : implications tectoniques et environnementales. Geomorphologie einer aufgedeckten Karbon-Paläooberfläche in der südlichen Gaspé-Halbinsel: Folgen für Paläoumwelt und Tektonik. Pierre Jutras and Jacques Schroeder Volume 53, Number 2, 1999 Article abstract Carboniferous sedimentation in the southern Gaspé Peninsula has fossilized a URI: https://id.erudit.org/iderudit/005690ar paleosurface which is now gradually being exhumed by erosion. Part of the DOI: https://doi.org/10.7202/005690ar surface was horizontally cut by a major peneplanation event that took place between 290 Ma (Permian) and 200 Ma (Jurassic). Exhumation of the surface See table of contents below the peneplanation line must also have started by Jurassic time in response to the en bloc uplift of the evolving Atlantic Ocean's passive margins. Some geomorphic features of the exhumed paleosurface bring clues regarding Publisher(s) Carboniferous paleoenvironments and tectonics. A planation surface limited by a scarp, which is leading to a higher planation surface occupied by the same Les Presses de l'Université de Montréal rock formations, is here interpreted as a paleo- wave-cut platform (associated to the Windsor transgression) for it cannot be explained by differential ISSN erosion, fault movement or "etchplanation". A series of fault scarps cutting through planation surfaces are interpreted as being the result of post-Acadian 0705-7199 (print) fault activity. The preservation of limestone hogbacks on the exhumed 1492-143X (digital) paleosurface, which are interpreted as having evolved under an arid climate, is believed to be either related to a pre-Windsor clastic fossilization or to Explore this journal post-Windsor lateral displacement. The tightly embanked river system, which is still currently dissecting the Peninsula's main planation surface, and the karstic systems of both that surface and the exhumed paleosurface, are Cite this article interpreted as having evolved since Jurassic Time, except for a few cases of river antecedence in the north-central highlands which are interpreted as Jutras, P. & Schroeder, J. (1999). Geomorphology of an Exhumed Carboniferous representing even older river routes. Paleosurface in the Southern Gaspé Peninsula, Québec: Paleoenvironmental and Tectonic Implications. Géographie physique et Quaternaire, 53(2), 249–263. https://doi.org/10.7202/005690ar Tous droits réservés © Les Presses de l'Université de Montréal, 1999 This document is protected by copyright law. Use of the services of Érudit (including reproduction) is subject to its terms and conditions, which can be viewed online. https://apropos.erudit.org/en/users/policy-on-use/ This article is disseminated and preserved by Érudit. Érudit is a non-profit inter-university consortium of the Université de Montréal, Université Laval, and the Université du Québec à Montréal. Its mission is to promote and disseminate research. https://www.erudit.org/en/ Géographie physique et Quaternaire, 1999, vol. 53, n° 2, p. 249-263, 10 fig. GEOMORPHOLOGY OF AN EXHUMED CARBONIFEROUS PALEOSURFACE IN THE SOUTHERN GASPÉ PENINSULA, QUÉBEC : PALEOENVIRONMENTAL AND TECTONIC IMPLICATIONS Pierre JUTRAS* and Jacques SCHROEDER**, Département des Sciences de la Terre, Département de Géographie, Université du Québec à Montréal, C.P. 8888, succursale Centre-ville, Montréal, Québec H3C 3P8. , 1999, vol. 53, n° 2, 10 fig., 53(2), 1999P. JUTRAS and J. SCHROEDER ABSTRACT Carboniferous sedimentation RÉSUMÉ Géomorphologie d’une paléosur- ZUSAMMENFASSUNG Geomorphologie in the southern Gaspé Peninsula has fossil- face exhumée dans le sud de la Gaspésie, einer aufgedeckten Karbon-Paläooberfläche ized a paleosurface which is now gradually Québec : implications tectoniques et environne- in der südlichen Gaspé-Halbinsel : Folgen für being exhumed by erosion. Part of the surface mentales. La sédimentation du Carbonifère Paläoumwelt und Tektonik. Die Sedimentie- was horizontally cut by a major peneplanation dans le sud de la péninsule gaspésienne a fos- rungen im Karbon in der südlichen Gaspé- event that took place between 290 Ma (Per- silisé une paléosurface qui est maintenant gra- Halbinsel führte zur Fossilisation einer mian) and 200 Ma (Jurassic). Exhumation of duellement exhumée par érosion. Une partie de Paläooberfläche, die jetzt durch Erosion lang- the surface below the peneplanation line must cette surface a été coupée à l’horizontale au sam bloßgelegt wird. Ein Teil der Fläche wurde also have started by Jurassic time in response cours d’un épisode majeur de pénéplanation horizontal durch ein bedeutendes Einebnungs- to the en bloc uplift of the evolving Atlantic s’étant déroulé entre 290 Ma (Permien) et 200 Ereignis durchschnitten, das zwischen 290 Ma Ocean’s passive margins. Some geomorphic Ma (Jurassique). L’exhumation de cette sur- (Perm) und 200 Ma (Jura) stattfand. Die Bloß- features of the exhumed paleosurface bring face, sous la ligne de pénéplanation, doit aussi legung der Fläche unter der Einebnungslinie clues regarding Carboniferous paleoenviron- avoir débuté au cours du Jurassique en réponse muss auch in der Jura-Zeit begonnen haben ments and tectonics. A planation surface lim- au soulèvement « en bloc » des marges passi- als Reaktion auf die « en bloc »-Anhebung der ves de l’océan Atlantique, alors en processus sich entwickelnden passiven Küstenzone des ited by a scarp, which is leading to a higher d’ouverture. Certains traits géomorphologiques de Atlantischen Ozeans. Einige geomorphologi- planation surface occupied by the same rock la paléosurface exhumée fournissent des indi- sche Merkmale der aufgedeckten Paläoober- formations, is here interpreted as a paleo- ces concernant la tectonique et les paléoenvi- fläche liefern Hinweise in Bezug auf wave-cut platform (associated to the Windsor ronnements du Carbonifère. Une surface Paläoumwelt und Tektonik im Karbon. Eine transgression) for it cannot be explained by dif- d’aplanissement limitée par un escarpement, Einebnungsoberfläche, die durch einen ferential erosion, fault movement or “etchpla- lequel mène à une autre paléosurface surélevée Abhang begrenzt ist, welcher zu einer höher nation”. A series of fault scarps cutting through occupée par les mêmes formations rocheuses, gelegenen Einebnungsfläche mit denselben planation surfaces are interpreted as being the est ici considérée comme une paléoterrasse Felsformationen führt, wird hier als eine Paläo- result of post-Acadian fault activity. The pres- d’abrasion (associée à la transgression du Abrasionsplatte interpretiert (welche mit der ervation of limestone hogbacks on the Windsor) car celle-ci ne peut s’expliquer dans un Windsor-Transgression in Verbindung exhumed paleosurface, which are interpreted contexte d’érosion différentielle, de mouvement gebracht wird), denn sie kann nicht durch Dif- as having evolved under an arid climate, is de faille ou d’« etchplanation ». Une série ferentialerosion, Verwerfungsbewegung oder believed to be either related to a pre-Windsor d’escarpements de faille découpant les surfa- « Etchplanation » erklärt werden. Eine Reihe clastic fossilization or to post-Windsor lateral ces d’aplanissement sont considérés comme von Verwerfungshängen, welche die Eineb- displacement. The tightly embanked river sys- étant le résultat d’une activité de faille post-aca- nungsoberflächen durchschneiden, interpre- tem, which is still currently dissecting the Pen- dienne. La préservation de crêts calcaires sur la tiert man als Ergebnis einer post-akadischen insula’s main planation surface, and the karstic paléosurface exhumée, montrant un faciès mor- Verwerfungsaktivität. Die Erhaltung von Kalk- systems of both that surface and the exhumed phologique témoignant d’un climat aride, est ici stein-Graten auf der bloßgelegten Paläoober- paleosurface, are interpreted as having considérée comme étant liée à une fossilisation fläche, von denen man meint, dass sie sich in evolved since Jurassic Time, except for a few clastique pré-windsorienne ou à un déplace- einem trockenen Klima entwickelt haben, führt cases of river antecedence in the north-central ment latéral post-windsorien. Le réseau fluvia- man entweder auf eine Prä-Windsor-Fragmen- highlands which are interpreted as represent- tile très étroitement encaissé, qui encore talfossilisation oder eine Post-Windsor-Late- ing even older river routes. présentement dissecte la surface d’aplanisse- ralverschiebung zurück. Das eng eingesenkte ment principale de la péninsule, et les systèmes Flusssystem, das immer noch die Haupt-Eine- karstiques de cette surface et de la paléosurface bungsoberfläche der Halbinsel durchschneidet exhumée, sont interprétés comme ayant évolué und die Karst-Systeme sowohl dieser Oberflä- depuis les temps jurassiques. Cependant, quel- che wie auch der bloßgelegten Paläooberflä- ques cas d’antécédences fluviatiles dans les che interpretiert man als Ergebnis einer hautes-terres du centre-nord gaspésien, repré- Evolution seit dem Jura. Davon ausgenommen senteraient des entailles fluviatiles encore plus sind einige vorausgehende Fluss-Ereignisse anciennes. im zentralen nördlichen Hochland, die man als noch ältere Flussrouten interpretiert. Manuscrit reçu le 27 août 1998 ; manuscrit révisé accepté le 10 février 1999 * E-mail address:
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