Retrait de l’inlandsis sur les Laurentides au début de l’Holocène : transect de 600 km entre le Saint-Maurice et le Témiscamingue (Québec)

Simard, Julie; Occhietti, Serge; Robert, Francine

doi:10.7202/011313ar

Cited by 11 publications

(20 citation statements)

References 28 publications

(22 reference statements)

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“…Tracé de la Moraine Mars-Batiscan d'après Govare (1995), Bolduc (1995), Robert (2001) et Simard et al (2003). Limites du front glaciaire du lobe de l'Outaouais d'après Barnett (1988) et cet article.…”

Section: °72°funclassified

“…Voir Occhietti et al (2001) pour les moraines du sud du Québec. Tracé du front glaciaire au nord-ouest de la Moraine Mars-Batiscan d'après Simard et al (2003). Eskers de Occhietti et al (2004).…”

Section: °72°funclassified

“…The Mars-Batiscan Moraine has been observed in the Charlevoix region (Govare, 1995), in the Parc des Laurentides Highlands (Bolduc, 1995), and recently in the middle reaches of the Saint-Maurice Valley (Robert, 2001;Simard et al, 2003), at a distance of 17 km from the SaintNarcisse Moraine in the eastern part and 70 km from the lower Saint-Maurice area (Fig. 2).…”

Section: Moraines North Of the Saint-narcisse Morainic Complex In Québecmentioning

confidence: 99%

“…Extent, lobes and re-entrants of the Saint-Narcisse morainic complex and other moraines in Québec. Mars-Batiscan Moraine outline from Govare (1995), Bolduc (1995), Robert (2001) and Simard et al (2003). Ice front positions of the Outaouais Lobe from Barnett (1988) and this paper.…”

Section: °72°fmentioning

confidence: 99%

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The Saint-Narcisse morainic complex and early Younger Dryas events on the southeastern margin of the Laurentide Ice Sheet

Occhietti

2010

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The Saint-Narcisse morainic complex extends over 750 km along the southern margin of the Laurentian Highlands in Québec, north of the St. Lawrence Valley, between the Ottawa and Saguenay Rivers. To the east, the Laurentide Ice Sheet margin was located in the present St. Lawrence Estuary. To the west, the morainic complex is extended 235 km west of the Ottawa River to the Algonquin Highlands, in Ontario. The general outline of the morainic complex comprises large lobes and reentrants, related to major topographic features. In the lower Saint-Maurice River area, the moraine is composed of reworked clay and till and proximal glaciomarine deposits (Yamachiche Diamicton) and melt-out till and ice-marginal outwash (Charette Drift). The Saint-Narcisse Event can be subdivided in several phases: local readvance in low areas, main phase at the origin of the Saint-Narcisse Moraine s.s., melting-out of the marginal ice with compressive structures and large proglacial outwash features, and slow retreat with secondary ridges. The accuracy of the chronological data is limited by several factors: and a floating chronology is proposed. Two landmarks constrain the age and range of duration of the main Saint-Narcisse phase. The main ridge deposition occured after the onset, ca. 12.9 cal ka, of Champlain Sea in the St. Lawrence Valley, and a rapid ice retreat on the southern edge of the Laurentians. It ended before the drawdowm, in the Lake Huron basin, of Glacial Lake Algonquin ca. 12.5 cal ka. The Saint-Narcisse Event is related to the early cold phase of Younger Dryas, as evidenced by other YD ice readvances in Maine, Nova Scotia, and ice cover on the Gaspé Peninsula. It corresponds to a positive change of the budget of the Laurentide Ice Sheet as a result of climate forcing. After a slow ice front retreat during about 900-700 yr, the final phase of YD is marked by the Mars-Batiscan Moraine, located 17 to 70 km north of the Saint-Narcisse Moraine.Le complexe morainique de Saint-Narcisse s’étend sur 750 km le long de la marge méridionale des Laurentides, au Québec, au nord de la vallée du Saint-Laurent, entre l’Outaouais et le Saguenay. Vers l’est, la marge glaciaire était située dans l’estuaire actuel du Saint-Laurent. Vers l’ouest, en Ontario, les formes associées sont suivies dans le massif Algonquin, jusqu’à 235 km de l’Outaouais. Le tracé général du complexe inclut de grands lobes et rentrants liés à la topographie. Dans la basse vallée du Saint-Maurice, la Moraine de Saint-Narcisse est composée de dépôts glaciomarins proximaux, de till et d’argile marine remaniée (Diamicton de Yamachiche) et de till de fusion sur place et de dépôts fluvioglaciaires et juxtaglaciaires (Dépôts de Charette). L’Épisode de Saint-Narcisse est subdivisé en plusieurs phases non nécessairement synchrones sur toute la marge glaciaire: réavancée locale dans les dépressions importantes, phase majeure de stabilisation à l’origine de la Moraine de Saint-Narcisse, fonte sur place indiquée par des structures imbriquées et épandages proglaciaires, puis retra...

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Section: °72°funclassified

Section: Moraines North Of the Saint-narcisse Morainic Complex In Québecmentioning

confidence: 99%

Section: °72°fmentioning

confidence: 99%

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The Saint-Narcisse morainic complex and early Younger Dryas events on the southeastern margin of the Laurentide Ice Sheet

Occhietti

2010

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“…Although a regional advance (Marquette readvance) of the Laurentide Ice Sheet about 500 km wide reached the southern coast of the Superior basin at 10 ka BP (11.5 cal ka BP) (Lowell et al, 1999), and ice retreat was slowed during the Younger Dryas in eastern Ontario and western Québec (Simard et al, 2003), there is no evidence of ice advance or Clark et of delayed isostatic recovery in the Georgian Bay-North Bay outlet region, about 300-500 km east of the Superior basin (Dyke et al, 2003). As a result, it is highly unlikely that rebound was delayed significantly and, at the time of late Lake Stanley ( Fig.…”

Section: Previous Recognition Of Low Lake Levels In Huron Basinmentioning

confidence: 99%

Glacial Isostatic Adjustment of the Laurentian Great Lakes Basin: Using the Empirical Record of Strandline Deformation for Reconstruction of Early Holocene Paleo-Lakes and Discovery of a Hydrologically Closed Phase*

Lewis

Blasco

Gareau³

2007

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In the Great Lakes region, the vertical motion of crustal rebound since the last glaciation has decelerated with time, and is described by exponential decay constrained by observed warping of strandlines of former lakes. A composite isostatic response surface relative to an area southwest of Lake Michigan beyond the limit of the last glacial maximum was prepared for the complete Great Lakes watershed at 10.6 ka BP (12.6 cal ka BP). Uplift of sites computed using values from the response surface facilitated the transformation of a digital elevation model of the present Great Lakes basins to represent the paleogeography of the watershed at selected times. Similarly, the original elevations of radiocarbon-dated geomorphic and stratigraphic indicators of former lake levels were reconstructed and plotted against age to define lake level history. A comparison with the independently computed basin outlet paleo-elevations reveals a phase of severely reduced water levels and hydrologically-closed lakes below overflow outlets between 7.9 and 7.0 ka BP (8.7 and 7.8 cal ka BP) in the Huron-Michigan basin. Severe evaporative draw-down is postulated to result from the early Holocene dry climate when inflows of meltwater from the upstream Agassiz basin began to bypass the upper Great Lakes basin.Dans la région des Grands Lacs, le soulèvement isostatique lié à la dernière glaciation a ralenti selon une courbe de décroissance exponentielle établie à partir du gauchissement observé dans les anciennes lignes de rivage lacustres. Une surface de référence composite de la réponse isostatique datant de 10,6 ka BP (12,6 cal ka BP) a été préparée pour l’ensemble du bassin-versant des Grands Lacs, par rapport à une région au sud-ouest du lac Michigan située au-delà de la limite du dernier maximum glaciaire. Le calcul du soulèvement des sites en fonction des altitudes de la surface de référence a facilité la conversion d’un modèle altimétrique de terrain du bassin actuel des Grands Lacs en des cartes paléo-géographiques pour différents âges choisis. De plus, afin de définir l’évolution des niveaux lacustres, les altitudes initiales des indicateurs géomorphologiques et stratigraphiques des paléo-niveaux lacustres, datés au 14C, ont été reconstituées puis reportées en fonction de l’âge. La comparaison de cette courbe à celles des paléo-altitudes des exutoires lacustres, calculée indépendamment, révèle, entre 7,9 et 7 ka BP (8,7 et 7,8 cal ka BP), une phase d’abaissement majeur des niveaux lacustres au-dessous de ceux des exutoires et la fermeture hydrologique des lacs dans le bassin des lacs Huron-Michigan. La forte évaporation nécessaire à l’abaissement du niveau d’eau est attribuée à un climat sec peu après le début de l’Holocène, dans un contexte de détournement progressif hors des Grands Lacs des eaux de fonte du lac Agassiz

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Late Pleistocene–Early Holocene Decay of the Laurentide Ice Sheet in Québec–Labrador

Occhietti

Parent

Lajeunesse

et al. 2011

Developments in Quaternary Sciences

105

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Retrait de l’inlandsis sur les Laurentides au début de l’Holocène : transect de 600 km entre le Saint-Maurice et le Témiscamingue (Québec)

Cited by 11 publications

References 28 publications

The Saint-Narcisse morainic complex and early Younger Dryas events on the southeastern margin of the Laurentide Ice Sheet

The Saint-Narcisse morainic complex and early Younger Dryas events on the southeastern margin of the Laurentide Ice Sheet

Glacial Isostatic Adjustment of the Laurentian Great Lakes Basin: Using the Empirical Record of Strandline Deformation for Reconstruction of Early Holocene Paleo-Lakes and Discovery of a Hydrologically Closed Phase*

Late Pleistocene–Early Holocene Decay of the Laurentide Ice Sheet in Québec–Labrador

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