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Déglaciation De La Vallée Supérieure De L'outaouais, Le Lac Barlow Et Le Sud Du Lac Ojibway, Québec

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Déglaciation De La Vallée Supérieure De L'outaouais, Le Lac Barlow Et Le Sud Du Lac Ojibway, Québec Document généré le 2 oct. 2021 22:05 Géographie physique et Quaternaire Déglaciation de la vallée supérieure de l’Outaouais, le lac Barlow et le sud du lac Ojibway, Québec Déglaciation of the Upper Ottawa River Valley, Lake Barlow and South of Lake Ojibway, Québec Deglaziation des oberen Tales des Outaouais Flusses, des Barlow Sees, und des sülichen Ojibway Sees, Québec Jean Veillette Volume 37, numéro 1, 1983 Résumé de l'article Cet article propose une séquence de déglaciation pour une région située à l'est URI : https://id.erudit.org/iderudit/032499ar du lac Témiscamingue. La séquence est basée sur la cartographie des DOI : https://doi.org/10.7202/032499ar sédiments superficiels, sur de nombreuses marques d'écoulement glaciaire et sur des âges radiocarbones. Le tracé de la moraine d'Harricana se prolonge sur Aller au sommaire du numéro une longueur additionnelle de 125 km. L'extrémité sud de la moraine, au lac Témiscamingue, se rattache à la moraine du lac McConnell du côté ontarien, et il est probable que les deux fassent partie du même ensemble morainique. Plus Éditeur(s) de 400 mesures d'altitude prises sur des limites de délavage marquant le niveau maximal glaciolacustre et sur des hauts points de la plaine argileuse Les Presses de l'Université de Montréal (varves) indiquent qu'une profondeur d'eau de l'ordre de 50 m est requise pour la sédimentation des varves dans cette région. La zone intermédiaire ISSN comprend les surfaces ennoyées par les eaux proglaciaires, mais d'une profondeur de moins de 50 m. La valeur de Mysis relicta comme indicateur 0705-7199 (imprimé) biologique de l'aire d'extension paléolacustre maximale est mise en doute. 1492-143X (numérique) Parce que la survie de Mysis est intimement liée à des conditions spécifiques de température et de profondeur d'eau, on suppose que l'organisme ait pu être Découvrir la revue éliminé de certains bassins lacustres par suite de variations paléoclimatiques entraînant une hausse de la température de l'eau et une baisse du niveau des lacs. Il est probable que la retenue des eaux du lac Barlow, au moins au début Citer cet article de la déglaciation, soit due à la présence de glace provenant du glacier du Nouveau-Québec se prolongeant vers le sud-ouest et barrant l'auge du lac Veillette, J. (1983). Déglaciation de la vallée supérieure de l’Outaouais, le lac Témiscamingue et de la rivière des Outaouais, au sud de la moraine du lac Barlow et le sud du lac Ojibway, Québec. Géographie physique et Quaternaire, McConnell. 37(1), 67–84. https://doi.org/10.7202/032499ar Tous droits réservés © Les Presses de l'Université de Montréal, 1983 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/ Géographie physique et Quaternaire, 1983, vol. XXXVlI, nc 1, p. 67-84, 15 fig., 1 tabl. DÉGLACIATION DE LA VALLÉE SUPÉRIEURE DE L'OUTAOUAIS, LE LAC BARLOW ET LE SUD DU LAC OJIBWAY, QUÉBEC Jean VEILLETTE, Commission géologique du Canada, Division de la science des terrains, 601, rue Booth, Ottawa, Ontario K1A0E8. RÉSUMÉ Cet article propose une sé­ ABSTRACT Déglaciation of the upper ZUSAMMENFASSUNG Deglaziation des quence de déglaciation pour une région Ottawa River valley, Lake Barlow and oberen Tales des Outaouais Flusses, située à l'est du lac Témiscamingue. La south of Lake Ojibway, Québec. A se­ des Barlow Sees, und des sûdlichen séquence est basée sur la cartographie quence of déglaciation is proposed for Ojibway Sees, Québec. Dieser Artikel des sédiments superficiels, sur de nom­ an area east of lake Témiscamingue. It is schlagt eine Sekvenz fur die Deglazia­ breuses marques d'écoulement glaciaire based on the mapping of surficial depo­ tion der Gegend ôstlich vom Témisca­ et sur des âges radiocarbones. Le tracé sits, on a large number of ice movement mingue See vor. Diese Reihenfolge de la moraine d'Harricana se prolonge indicators and on 14C dates. Mapping of grundet sich auf die Kartographie von sur une longueur additionnelle de 125 the Harricana moraine is extended for an Oberflâchensedimenten, zahlreiche km. L'extrémité sud de la moraine, au lac additional 125 km, the southern end of Eisbewegungsspuren, und auf Karbon 14 Témiscamingue, se rattache à la moraine the moraine on the Québec side joins Daten. Die Kartographie der Harricana du lac McConnell du côté ontarien, et with the Lake McConnell moraine in Morâne dehnt sich noch ùber zusâtzliche il est probable que les deux fassent par­ Ontario. This suggests that both may 135 km aus, des Sùdende der Morâne tie du même ensemble morainique. Plus belong to the same morainic system. A von Québec aus erreicht die McConnell de 400 mesures d'altitude prises sur des water depth of around 50 m is required See Morâne in Ontario. Es ist wahr- limites de délavage marquant le niveau for the sedimentation of varves in this scheinlich, dass beide dem gleichen maximal glaciolacustre et sur des hauts region. This results from more than 400 Morânensystem angehôren. Eine Was- points de la plaine argileuse (varves) elevation measurements recorded on sertiefe von ungefâhr 50 m ist notwendig indiquent qu'une profondeur d'eau de washing limits marking the maximum zur Sedimentation von Warwen in der l'ordre de 50 m est requise pour la sé­ glaciolacustrine level and on high points Gegend. Das ergibt sich aus mehr als dimentation des varves dans cette région. of the clay plain (varves). The interme­ 400 Hôhenmessungen, die an der Aus- La zone intermédiaire comprend les sur­ diate zone includes surfaces covered by waschungsgrenzmarke des hôchsten faces ennoyées par les eaux progla­ glaciolacustrine water but where the glazio-lakustrinen Wasserspiegels und ciaires, mais d'une profondeur de moins depth was less than 50 m. The value of auf hohen Plâtzen der Tonebene (War­ de 50 m. La valeur de Mysis relicta com­ Mysis relicta as a biological indicator of wen) gemessen wurden. Die Zwischen- me indicateur biologique de l'aire d'ex­ maximal paleolacustrine transgression is zonen schliessen von glazio-lakustrinem tension paléolacustre maximale est mise questioned. Mysis is dependent on spe­ Wasser bedeckte Oberflâchen von en doute. Parce que la survie de Mysis cific water temperature and depth for its weniger als 50 m Tiefe ein. Der Wert von est intimement liée à des conditions spé­ survival. Because of this Mysis may have "Mysis relicta" als biologischer Anzeiger cifiques de température et de profondeur been completely eliminated from certain von maximaler paleo-lakustriner Trans­ d'eau, on suppose que l'organisme ait pu lacustrine basins following paleoclimatic gression ist fraglich. Mysis ist von être éliminé de certains bassins lacustres conditions leading to lower water levels einer bestimmten Wassertemperatur und par suite de variations paléoclimatiques and higher water temperatures. Dam­ Tiefe fur sein Uberleben abhângig. entraînant une hausse de la température ming of lake Barlow, at least in its initial Deswegen konnte Mysis von bestimmten de l'eau et une baisse du niveau des lacs. phase, is probably due to the Nouveau- Seebecken, infolge von paleoklimatis- Il est probable que la retenue des eaux Québec glacier extending to the south­ chen Verhàltnissen welche zu niedri- du lac Barlow, au moins au début de la west across Lake Témiscamingue and gerem Wasserspiegel und hoheren Was- déglaciation, soit due à la présence de the Ottawa River south of the Lake Mc­ sertemperaturen gefùhrt haben, vollkom- glace provenant du glacier du Nouveau- Connell Moraine. men verschwunden sein. Die Eindâm- Québec se prolongeant vers le sud-ouest mung des Barlow Sees, zumindest in et barrant l'auge du lac Témiscamingue seinem Anfangsstadium, ist wahr- et de la rivière des Outaouais, au sud de scheinlich auf die Ausdehnung des la moraine du lac McConnell. Nouveau Québec Gletschers nach Sud- westen ùber den Témiscamingue See und den Outaouais Fluss sùdlich der McConnell See Morâne zuruck zu fùhren. 68 J. VEILLETTE INTRODUCTION Un relevé des formations superficielles à l'est du lac Témiscamingue (fig. 1) a été effectué de 1977 à 1981. Au total, une superficie comprenant un peu plus de 16 car­ tes à 1/50 000 a été examinée sur le terrain selon les ob­ jectifs suivants: (1) Préciser l'aire d'extension du lac Barlow et du lac Ojibway dans sa partie sud, et préciser la localisation des exutoires majeurs ayant servi à la vi­ dange de ces lacs vers le sud. (2) Établir le mode de déglaciation de la région et la chronologie des princi­ paux épisodes glaciaires. (3) Échantillonner et analyser le till de façon systématique pour la distribution d'élé­ ments traces et d'indicateurs lithologiques. (4) Échan­ tillonner et analyser le till et d'autres sédiments meu­ bles, surtout les varves, afin d'évaluer la capacité tam­ pon du sol pour les pluies acides. Cet article se limite aux deux premiers objectifs énoncés et vise avant tout à communiquer de nouvelles données sur la dégla­ ciation de cette région. L'un des principaux attraits de cette région pour l'étude du Quaternaire nous vient de la séquence des épisodes glaciaires, jusqu'à maintenant mal connue, FIGURE 1. Région à l'étude. La partie sud, indiquée par un mais dont la complexité est reconnue depuis longtemps pointillé, a été visitée au cours de l'été 1981, mais la répartition (BARLOW, 1899, 1907).
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