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La Déglaciation De La Côte Nord Du Saint-Laurent : Analyse Sommaire Deglaciation of the North Shore of the St

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La Déglaciation De La Côte Nord Du Saint-Laurent : Analyse Sommaire Deglaciation of the North Shore of the St Document généré le 28 sept. 2021 18:14 Géographie physique et Quaternaire --> Voir l’erratum concernant cet article La déglaciation de la Côte Nord du Saint-Laurent : analyse sommaire Deglaciation of the North Shore of the St. Lawrence River: brief analysis Jean-Marie Dubois Troisième Colloque sur le Quaternaire du Québec : 2e partie Résumé de l'article Volume 31, numéro 3-4, 1977 Entre l’embouchure du Saguenay et Blanc-Sablon, sur la Côte Nord du Saint-Laurent, des indices géomorphologiques et parfois sédimentologiques URI : https://id.erudit.org/iderudit/1000275ar permettant de reconstituer la position frontale de la calotte laurentidienne en DOI : https://doi.org/10.7202/1000275ar récession ont été relevés sur plus de 1 000 km. Les diverses positions frontales cartographiées semblent appartenir à trois grands systèmes : 1) le système Aller au sommaire du numéro morainique de Brador qui pourrait se raccorder au système de Saint-Narcisse daté de 10 900 à 11 200 ans BP et qui pourrait aussi être contemporain de la récurrence du Ten Mile Lake, à Terre-Neuve, datée d’environ 11 000 ans BP; 2) le système morainique de Baie-Trinité qui pourrait être contemporain de la Éditeur(s) pause de Métabetchouane datée de 10 100 à 10 300 ans BP. Le segment Les Presses de l’Université de Montréal morainique de la rivière du Sault aux Cochons près de Forestville pourrait en être un des éléments; 3) le système morainique de Manitoy-Matamek, qui englobe la moraine du lac Daigle et la position de Manitou-Matamek, qui ISSN englobe la moraine du lac Daigle et la position frontale de Natashquan, ne se 0705-7199 (imprimé) raccorde à aucun système connu. Il est plus jeune que la pause de 1492-143X (numérique) Métabetchouane et plus vieux que le système de Sakami daté de 7900 BP. Les faits démontrent, en partie du moins, qu’il est synchrone de la transgression Découvrir la revue maximale de la mer de Goldthwait vers 9500 à 9600 ans BP, dont l’altitude est de 128-131 m dans la région entre Moisie et Mingan. Citer cet article Dubois, J.-M. (1977). La déglaciation de la Côte Nord du Saint-Laurent : analyse sommaire. Géographie physique et Quaternaire, 31(3-4), 229–246. https://doi.org/10.7202/1000275ar Tous droits réservés © Les Presses de l’Université de Montréal, 1977 Ce document est protégé par la loi sur le droit d’auteur. L’utilisation des services d’Érudit (y compris la reproduction) est assujettie à sa politique d’utilisation que vous pouvez consulter en ligne. https://apropos.erudit.org/fr/usagers/politique-dutilisation/ Cet article est diffusé et préservé par Érudit. Érudit est un consortium interuniversitaire sans but lucratif composé de l’Université de Montréal, l’Université Laval et l’Université du Québec à Montréal. Il a pour mission la promotion et la valorisation de la recherche. https://www.erudit.org/fr/ Géogr. pfiys. Quaf., 1977, vol. XXXI, nos3-4 , p. 229-246. LA DÉGLACIATION DE LA CÔT E NORD DU SAINT-LAURENT: ANALYSE SOMMAIRE Jean-Marie DUBOIS, Département de géographie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1. RÉSUMÉ Entre l'embouchure du Sa­ ABSTRACT Déglaciation of the North PE3K3ME OTCTYnAHME /lEflHMKOB OT CEBEP- guenay et Blanc-Sablon, sur la Côte Shore of the St. Lawrence River: brief Horo noBEPEmbE PEKH CB. /IABPEHTUH- Nord du Saint-Laurent, des indices géo­ analysis. Many geomorphological and CyMMAPHblR AHA/1M3. Ha ceBepHOM nooepewbe pei<n CsjIaBpeHTMH. Meway ycTbeM pe*n CareHeH morphologiques et parfois sédimentolo- sometimes sedimentological indications H aepeBHefl Bnan-CaônoH KOTopue naxoAflTCR Ha giques permettant de reconstituer lapo ­ of the recessionnal positions of the Lau­ paccTOHHHH CBbiuje 10OO KMOB. Apyr OTAPyra . 6bimi sition frontale de la calotte laurenti- rentide ice shee t have been surveyed on OTMeMeHbi reoMop<l>o/iornMeCKn.e n ceAMMeHTono- ramecKaie npn3HaKn c noMOUibK) KOTopbix BOSMOJK- dienne en récession ont été relevés sur 1,000 km between the Saguenay River H06 BOCnpoH3BejieHne n03HU.UH OKOHMaHMR JlaB- plus de 100 0km .Le s diverse s positions and Blanc-Sablon onth e North Shore of petHTHHCKoro neAHMKOBOro Kynona, HaxoAHBuueroCR frontales cartographiées semblent ap­ the St. Lawrence River. These ice front B oTCTynaHHH. ôbino coaaaHO. PasnnnHbie KapTor- partenir à trois grands systèmes: 1) le positions may be divided in three major pactiHMecKHe (frpoHTanbHbie no3HunH KaK ÔVATO npn- HaanewaT K TDOHM KpynHbiM CHCTOMaM: 1) MopeHHan système morainique de Brador qui pour­ systems: 1) the Brador morainic system CHCTeMa no HaasaHHio Bpaaop KOTopafl MOMCT 6biTb rait se raccorder au système de Saint- might be correlated with the Saint Nar­ HMeeT oTHoujeHiae K MopenHOft CHCTCMe CB.Hap - Narcisse daté de 10900 à 11 20 0an s BP cisse system (10,900-11,200 BP)an dth e UHCca KOTopan jiaTupyeTCfl OT 10900 AO 11200 neT et qui pourrait aussi être contemporain Ten Mile Lake readvance (11,000 BP); TOMy Ha3aji. CucTBMa Bpaaop MOWOT M TaKme 6biTb COBpeMeHHHKOM npOABHMKH TeH Mann jl3K B HbK>- de la récurrence du Ten Mile Lake, à 2) the Baie-Trinité morainic system might (JjayHji/ieHfle. KOTopan AaTnpyeTCR OKOHO 11000 neT Terre-Neuve, datée d'environ 11 000 ans be correlated with the Métabetchouane Toaay Hasaa: 2) MopeHHan cucTeMa no HasBaHHio EaA- BP; 2) le système morainique de Baie- halt dated 10,100-10,300 BP. The mo­ TpHHHTeH KOTOpaR MOweT 6blTb C0BpeM6HHHK0M Trinité qui pourrait être contemporain de raine of Sault aux Cochons River near naysbi no HaaeaHHio MeTaoeiuyaH jiaTvipoBaHa OT 10100 AO 10300 neT TOMy Haaaa. MopeHHbiH OTpeaoK la pause de Métabetchouane datée de Forestville seems to be a part of the c peKH Co O KOUJOH HejianeKO OT MecTenxa (DopecT- 10 100 à 10300 ans BP . Le segmen t mo ­ system; 3) the Manitou-Matamek mo­ Bunnb MomeT H 6biTb OAHH H3 aeTanen: 3) MopeHHan rainique de la rivière du Sault auxCo ­ rainic system which includes the Lac CHCTBMa no HaaBaHiaio MaHHTy-MaTaMeK. KOTOpaa chons près de Forestville pourrait en Daigle moraine and the Natashquan ice oxBaTbieaeT MOpeHy no HaaeaHMio /IRKHer n H Towe ctipoHTanbHyio no3HUHio nejiHHKa HaTaujKBaH, He front position but can not be correlated être unde s élément s ; 3) le système mo­ HMeeT HHKaKOTO OTHOUjeHMR K niOOOM M3B6CTHOH rainique de Manitoy-Matamek, qui en­ with any other known systems. It is MopeHHOH CHCTerne 3Ta cxeMa (HO3) n a MHOTO MO- globe la moraine du lac Daigle et lapo ­ indeed younger than the Métabet­ nowe MeM naysa nejiHHKa MeTaoenuyaH H Ha MHOTO sition de Manitou-Matamek, qui englobe chouane halt and older than the Sakami CTapuje MeM MopeHHan caiCTeMa CaKaMM. naTnpo- la moraine du lac Daigle et la position system dated 7900 BP. Many dates show BaHHaa 7900 neT TOMy HaaaA. Ho AaHHbie AOKaabi- BaioT, no KpaHHen Mepe MacniMHO, MTO Bbiujeyno- frontale de Natashquan, ne se raccorde its synchronism, near 9500-9600 BP, with MHHyTaR CHCTeMa coBnaAaeT c MaKCMManbHOR TpaHC- à aucun système connu. Il est plus jeune the maximum submergence of the Gold ­ rpeccMeH Mopn ronATB3«T OT 9599 AO 9600 neT TOMy que la pause de Métabetchouane et thwait Seaa t 128-131 m of elevation be ­ HasaA TnyOHHHa aroro Mopn 6bina OT 128-131 MeTpoe plus vieux que le système de Sakami tween Moisie and Mingan . B paiâoHe MewAy Myaa* H MaHraH. daté de 7900 BP. Les faits démontrent, en partie du moins, qu'il est synchrone de la transgression maximale de lame r de Goldthwait vers 9500 à 9600 ans BP, dont l'altitude est de 128-131 m dans la région entre Moisie et Mingan. 230 J.-M. DUBOIS INTRODUCTION Le segment le plus oriental a aussi été cartographie par photo-interprétation sur une distance de plus de Cette contribution s'inscrit dans le cadre d'une thèse 105 km (GRANT, 1969a, 1970), entre la rivière Saint- de doctorat en préparation. Elle résume une partie des Paul et les collines de Brador, à la frontière du Québec- observations faites par l'auteur au cours des dernières Labrador. années et une partie des observations d'autres cher­ cheurs (DREDGE, 1976b). Les données sont parfois Par ailleurs quelques chercheurs ont observé ou noté incomplètes en raison de l'accessibilité difficile de une position frontale sur la rivière du Sault aux Co­ vastes territoires qui doivent être couverts par photo­ chons, près de Forestville (GADD, 1974), une autre au interprétation et du nombre restreint de datations 14C nord du delta de la rivière Natashquan (Gadd, comm. disponibles pour l'ensemble du secteur étudié. L'ac­ orale) une troisième au nord d'Aguanish (J. Vézina, cessibilité difficile du territoire exige un support finan­ comm. orale) et une quatrième position possible près cier considérable que peu d'organismes sont prêts à de la rivière Étamamiou au 60° de longitude ouest assumer; par ailleurs, le nombre restreint de datations (Grant, comm. orale). 14 au C n'autorise pas toujours les corrélations. Malgré Un examen des photographies aériennes permettrait ces contraintes, il a été possible de recueillir suffisam­ probablement de retracer les segments manquants de ment de données pour tracer le schéma régional de la ces complexes morainiques entre le Saguenay et la déglaciation de la Côte Nord du Saint-Laurent, princi­ rivière aux Outardes d'une part, et entre les rivières palement entre Baie-Comeau et Havre-Saint-Pierre Romaine et Saint-Paul d'autre part. Deux phénomènes interreliés sont étudiés ici: les positions frontales de la calotte laurentidienne en ré­ Les moraines de Ten Mile Lake et du Piedmont sur cession et la limite maximale de la mer de Goldthwait. la côte nord-ouest de Terre-Neuve (GRANT, 1969a, 1969b, 1972, 1977), en raison de leur rapport avec les événements survenus au nord du golfe du Saint- Laurent, ont aussi été reportées sur la figure 1.
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