Late Wisconsinan—Early holocene deglaciation of Québec-Labrador

Occhietti, Serge; Govare, Étienne; Klassen, R. A.; Parent, Michel; Vincent, J S

doi:10.1016/s1571-0866(04)80202-1

Cited by 17 publications

(29 citation statements)

References 112 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

“…Positions du front glaciaire associées au complexe morainique de Saint-Narcisse et aux moraines plus anciennes de Charlevoix, Québec, d'après Rondot (1974), Govare (1995) et Occhietti (2001. Morelli, 1986;Occhietti et al, 2004;Figs. 2 and 4).…”

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

“…Moraines de l'Ontario d'après Harrison (1972), Vincent (1989), Veillette (1994Veillette ( , 1996, Lewis et al (2005) et Daigneault et Occhietti (2006). Baie-Trinité belongs to the 800-km-long Québec North Shore Moraine (Dubois and Dionne, 1985) that is correlated to the Little Drunken and Sebaskachu Moraines in Labrador (Fulton, 1986a(Fulton, , 1986bDyke andPrest, 1987, 1989;Occhietti et al, 2004;Fig. 1).…”

Section: °Fmentioning

confidence: 99%

“…In Québec, the Saint-Narcisse Moraine (Fig. 1) is the most extensive late-glacial ice front landform north of the St. Lawrence Lowlands (Occhietti et al, 2004), after the Québec North Shore Moraine (Dubois and Dionne, 1985). Discontinuous ridges of the complex can be traced for over 750 km between the Ottawa (Outaouais) and Saguenay rivers (Fig.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Occhietti

2010

gpq

Self Cite

View full text Add to dashboard Cite

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...

show abstract

“…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

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

Section: °Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Occhietti

2010

gpq

Self Cite

View full text Add to dashboard Cite

show abstract

“…Le mode de déglaciation dans les Laurentides occidentales n'est pas directement connu ; les modèles de déglacia-tion entre la Moraine de Saint-Narcisse et la Moraine de Sakami sont donc très généraux (Dyke et Prest, 1987 ;Vincent, 1989 ;Dyke et al, 2003 ;Occhietti et al, 2004). Sauf pour le Témiscamingue (Veillette, 1983(Veillette, , 1988(Veillette, , 1994(Veillette, , 1996Daigneault, 1986), il n'existe pas de données suffisamment détaillées qui permettent de définir le patron de déglaciation du plateau Laurentidien, au nord de la vallée du Saint-Laurent ( fig.…”

Section: Introductionunclassified

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

Occhietti

Robert

2005

gpq

Self Cite

View full text Add to dashboard Cite

Jusqu’à récemment le mode de déglaciation dans les Laurentides occidentales était mal connu. À l’est, la Moraine Mars-Batiscan constitue la seule position frontale continue identifiée entre la Moraine de Saint-Narcisse et la Moraine de Sakami. Comme la Ceinture morainique de Cartier I, en Ontario, la Moraine Mars-Batiscan est maintenant associée à la fin du Pléistocène. Le territoire à l’étude est un transect, du Saint-Maurice au Témiscamingue, qui fait la jonction entre la Moraine Mars-Batiscan et la Ceinture morainique de Cartier. La cartographie systématique des formes glaciaires du transect à partir de photographies aériennes à l’échelle de 1/15 840, validée sur le terrain, a permis de reconstituer le patron de déglaciation. À l’est du transect, nous observons une inflexion de la marge glaciaire qui redevient relativement linéaire vers l’ouest selon une orientation générale ENE-OSO, avec plusieurs lobes et rentrants mineurs. La topographie est l’élément local qui régit le tracé du front glaciaire. La durée de la déglaciation entre les marges latitudinales du transect est de 600 ans, entre environ 11,46 et 10,86 ka cal. (10 000 et 9580 ans 14C BP). Une légère accélération du retrait glaciaire succède à la phase de la Moraine Mars-Batiscan, suivie de taux de retrait relativement constants. Le tracé des nouveaux isochrones précise celui des modèles antérieurs de déglaciation de la région Mattawa-Témiscamingue, puisqu’il montre un front de déglaciation linéaire et sans rentrant notable dans l’axe de l’Outaouais-Témiscamingue pendant la période étudiée.Until recently, the deglaciation pattern in the western Laurentians, Québec, was poorly known. To the East, the Mars-Batiscan Moraine marks the only continuous frontal position identified between the Saint-Narcisse and Sakami Moraines. As the Cartier Morainic Belt I in Ontario, the Mars-Batiscan Moraine is now related to the end of the Pleistocene. The study area is a transect between the Rivière Saint-Maurice and the Témiscamingue area, roughly in the axis of the Mars-Batiscan and Cartier moraines. The deglaciation pattern of this transect is based on a systematic mapping of glacial landforms by air photography analysis at a scale of 1:15 840, verified by fieldwork. The glacial margin is bent east of the transect, it becomes relatively linear westward with a WSW-ENE general orientation and several minor lobations and re-entrants. The glacial margin was mainly controlled by topography. Deglaciation between the latitudinal margins of the transect occurred over a period of 600 years, approximately between 11,46 and 10,86 cal ka (10 000 and 9580 14C yrs BP). An acceleration of the ice retreat rate occurred after the Mars-Batiscan Moraine phase, followed by relatively stable rates of retreat. The new isochrones improve the previous models of deglaciation of the Mattawa-Témiscamingue region. They show linear ice frontal positions, with no visible re-entrant in the axis of the Ottawa River-Témiscamingue area during the studied time span.Hasta hace poco el estilo de desgl...

show abstract

The glacial geomorphology of the Loch Lomond (Younger Dryas) Stadial in Britain: a review

Bickerdike

Evans

Stokes

et al. 2018

J Quaternary Science

View full text Add to dashboard Cite

This paper systematically reviews the glacial geomorphological evidence of the Loch Lomond Stadial (LLS; Younger Dryas) glaciation in Britain (12.9-11.7 ka). The geomorphology of sub-regions within Scotland, England and Wales is assessed, providing the most comprehensive synthesis of this evidence to date. The contrasting nature of the evidence at the local scale is reviewed and conceptual themes common to multiple sub-regions are examined. Advancements in glaciological theory, mapping technologies, numerical modelling and dating have been applied unevenly to localities across Britain, inhibiting a holistic understanding of the extent and dynamics of the LLS glaciation at a regional scale. The quantity and quality of evidence is highly uneven, leading to uncertainties regarding the extent of glaciation and inhibiting detailed analysis of ice dynamics and chronology. Robust dates are relatively scarce, making it difficult to confidently identify the limits of LLS glaciers and assess their synchroneity. Numerical models have allowed the glacier-climate relationships of the LLS to be assessed but have, thus far, been unable to incorporate local conditions which influenced glaciation. Recommendations for future research are made that will allow refined reconstructions of the LLS in Britain and contribute to a more comprehensive understanding of glacier-climate interactions during the Younger Dryas. #

show abstract

Late Wisconsinan—Early holocene deglaciation of Québec-Labrador

Cited by 17 publications

References 112 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

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

The glacial geomorphology of the Loch Lomond (Younger Dryas) Stadial in Britain: a review

Contact Info

Product

Resources

About