Sea Levels during the Past 35,000 Years

Milliman, John D.; Emery, K. O.

doi:10.1126/science.162.3858.1121

Cited by 455 publications

(154 citation statements)

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“…Le relèvement isostatique post-glaciaire a été calculé en ajoutant au niveau marin maximal, la valeur du relèvement eustatique complété depuis 7900 ans (environ 15-20 m) (CURRAY, 1965;MILLIMAN et EMERY, 1968) et la valeur estimée du relèvement isostatique effectué pendant l'épisode lacustre. Ces différentes données suggèrent que, depuis la déglaciation, le terrain s'est relevé de 310-315 m sur le versant est et de 245-250 m sur le versant sud.…”

Section: Le Relèvement Isostatique Post-glaciaireunclassified

La déglaciation et les épisodes lacustre et marin sur le versant québécois des basses terres de la baie de James

Hardy¹

2011

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Les relevés de terrain et l’étude photo-géomorphologique révèlent que le secteur glaciaire du Labrador s’est scindé en deux au droit de la moraine d’Harricana et que par la suite ces deux calottes résiduelles, appelées respectivement glacier du Nouveau-Québec et glacier d’Hudson, se sont retirées l’une vers le nord-est et l’autre vers le nord-ouest au contact des eaux profondes du lac Ojibway. Cette masse d’eau a eu pour effet d’accélérer le retrait des glaciers dont la marge flottait localement à la manière des plates-formes de glace. Le retrait du glacier du Nouveau-Québec fut entrecoupé de courtes pauses et d’un arrêt majeur défini par la moraine de Sakami qui recoupe l’extrémité nord-est des basses terres de la baie de James. Trois récurrences du glacier d’Hudson ont affecté le secteur sud-ouest des basses terres et deux de ces mouvements appartiennent aux réavancées de Cochrane. L’étude de séquences varvées et les caractéristiques du till indiquent qu’il s’agit de crues glaciaires d’une glace partiellement flottée. Le lac Ojibway s’est étendu vers l’est jusqu’à la moraine de Sakami et au-delà de la Grande Rivière vers le nord. Il s’est probablement drainé vers le nord à la hauteur du 80° de longitude ouest. La mer de Tyrrell, qui a submergé les basses terres de la baie de James et de la mer d’Hudson, a atteint l’altitude de 290 m sur le versant est et de 198 m sur le versant sud. La vidange du lac, l’invasion marine et l’arrêt de Sakami sont datés à 7900 ans BP, alors que les réavancées de Cochrane I et II ont atteint leur position maximale, il y a 8200 ans et 7975 ans.Combined evidence of field data and photo-geomorphology shows that the Labrador sector of the Laurentide ice sheet became divided along the Har-ricana Moraine and that the two resulting residual ice caps retreated northeasterly and northwesterly in contact with the deep waters of Lake Ojibway. The ice recession was accelerated by the presence of the lake and the ice margin was floated locally. The retreat of the New-Québec ice was broken by short halts and by a longer standstill shown by the Sakami Moraine which traverses the northeast border of the James Bay lowlands. Three significant readvances of the Hudson ice have been observed in the southwest portion of the lowlands. Two of those movements are identified as Cochrane readvances. Varves data and till characteristics indicate glacial surges of a locally grounded ice shelf. Lake Ojibway extended easterly as far as the Sakami Moraine and northerly beyond La Grande Rivière, and drained probably along longitude 80°W. The Tyrrell Sea reached an elevation of 290 m east of James Bay and 198 m south of it. The drainage of the lake, the marine invasion and the Sakami standstill are dated 7900 C14 years BP. Cochrane I and II surges reached their maximum extent 8200 and 7975 years ago

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Section: Le Relèvement Isostatique Post-glaciaireunclassified

La déglaciation et les épisodes lacustre et marin sur le versant québécois des basses terres de la baie de James

Hardy¹

2011

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“…10)] Neither the stated sample elevation errors (±15 cm) nor the 14 C date ranges significantly affected the positioning of the curve, which was set ''a short distance above'' the shallowest-occurring corals on the time-depth plot. Lighty et al's (1982) curve was defined as a minimum curve (keeping all coral submerged), yet the sea-level elevations it predicted exceeded those of pre-existing curves, which were based on various marine and marginal marine data [Curray (1961[Curray ( , 1965: combination of mollusk shells, wood, and peat; Redfield (1967): peat;Neumann (1971): peat;Milliman and Emery (1968): shells]. It provided a framework for future curves or curve segments which might indicate higher sea levels, provided any additional submersion did not exceed more than 5 m (i.e.…”

Section: Previous Workmentioning

confidence: 99%

Corrected western Atlantic sea-level curve for the last 11,000�years based on calibrated 14C dates from Acropora palmata framework and intertidal mangrove peat

2003

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A corrected western Atlantic Holocene sea-level curve was constructed from 145 calibrated 14 C and TIMS U-Th dates from shallow Acropora palmata framework and intertidal Rhizopora mangle peat from the Florida Keys, Belize, and the wider Caribbean. Data include both previously published and newly reported coral and peat dates. With the elevations of corals restricted to positions below sea level and those of peats to intertidal and higher levels, a curve bracketed by corals below and peat above effectively delineates the positions of a rising Holocene sea. From 3-11 ka, the corrected curve shifts progressively to older calibrated ages, reaching an $1-kyr increase at )21 m MSL (mean sea level). Elevations and calibrated ages of samples from each locality in the wider Caribbean region constitute an important database for future refinement with glaciohydro-isostatic elevation corrections from 3-D Earth models. In future studies of the history of western Atlantic coral reefs, scientists will be able to relate calibrated radiocarbon dates to this sea-level curve to determine paleo water depths and rates of sea-level rise.

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“…ages for the at1 terrace and the 27,740 years B.P. age for the reworked clay pod are in agreement with high stands of sea level (see, for example, Curray, 1965;Milliman and Emery, 1968;Field and others, 1979), then periods…”

mentioning

confidence: 49%

Pleistocene(?) and Holocene fluvial history of Uphapee Creek, Macon County, Alabama

Markewich¹,

Christopher²

1982

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Sea Levels during the Past 35,000 Years

Cited by 455 publications

References 20 publications

La déglaciation et les épisodes lacustre et marin sur le versant québécois des basses terres de la baie de James

La déglaciation et les épisodes lacustre et marin sur le versant québécois des basses terres de la baie de James

Corrected western Atlantic sea-level curve for the last 11,000�years based on calibrated 14C dates from Acropora palmata framework and intertidal mangrove peat

Pleistocene(?) and Holocene fluvial history of Uphapee Creek, Macon County, Alabama

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