Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland
Two revised relative sea-level (RSL) curves are presented for the Port au Choix to Daniel’s Harbour area of the Great Northern Peninsula, northwestern Newfoundland. Both curves are similar, showing continuous emergence of 120-140 m between 14 700 cal BP and present. The half-life of exponential curv...
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Les Presses de l'Université de Montréal
2005
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fterudit:oai:erudit.org:014751ar 2023-05-15T16:41:35+02:00 Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland Bell, Trevor Daly, Julia Batterson, Martin J. Liverman, David G.E. Shaw, John Smith, I. Rod 2005 http://id.erudit.org/iderudit/014751ar https://doi.org/10.7202/014751ar en eng Les Presses de l'Université de Montréal Érudit Géographie physique et Quaternaire vol. 59 no. 2-3 (2005) http://id.erudit.org/iderudit/014751ar doi:10.7202/014751ar Tous droits réservés © Les Presses de l'Université de Montréal, 2007 text 2005 fterudit https://doi.org/10.7202/014751ar 2022-09-24T23:13:01Z Two revised relative sea-level (RSL) curves are presented for the Port au Choix to Daniel’s Harbour area of the Great Northern Peninsula, northwestern Newfoundland. Both curves are similar, showing continuous emergence of 120-140 m between 14 700 cal BP and present. The half-life of exponential curves fit to the RSL data is 1400 years and the rate of emergence varies from ~2.3 m per century prior to 10 000 cal BP to ~0.13 m per century since 5000 cal BP. The curves fit a general pattern of RSL history along the west coast of Newfoundland, where there is a southward transition from solely emergence to emergence followed by submergence. Isostatic depression curves are generated for four RSL records spanning the west coast. Almost double the crustal depression is recorded to the northwest, reflecting the greater glacioisostatic loading by the Laurentide Ice Sheet over southern Labrador and Québec compared to a smaller loading centre by a regional ice complex over Newfoundland. Only the St. George’s Bay RSL record in the southwest appears to show evidence for a proglacial forebulge, when at 6000 cal BP an isostatic ridge of 4 m amplitude begins to collapse. Deux courbes du niveau marin relatif (NMR) sont présentées pour la région allant de Port-au-Choix à Daniel’s Harbour sur la Grande Péninsule Nord, au nord-ouest de Terre-Neuve. Les deux courbes sont semblables, montrant une émergence continue de 120 à 140 m entre 14 700 cal BP et l’actuel. La demi-vie des courbes exponentielles ajustées au NMR est de 1400 ans, et le taux d’émergence varie de ~2.3 m par siècle avant 10 000 cal BP à ~0.13 m par siècle depuis 5000 cal BP. Les courbes s’ajustent au modèle général de l’histoire du NMR de la côte ouest de Terre-Neuve, où il existe une transition d’émergence seule à une émergence suivie d’une submergence, en allant vers le sud. Des courbes de dépressions isostatiques préliminaires sont générées pour quatre chronologies du NMR couvrant la côte ouest. Presque le double de la dépression de la croûte est enregistré au ... Text Ice Sheet Newfoundland Port au Choix Terre-Neuve Érudit.org (Université Montréal) Newfoundland Port au Choix ENVELOPE(-57.365,-57.365,50.717,50.717) Géographie physique et Quaternaire 59 2-3 129 140 |
institution |
Open Polar |
collection |
Érudit.org (Université Montréal) |
op_collection_id |
fterudit |
language |
English |
description |
Two revised relative sea-level (RSL) curves are presented for the Port au Choix to Daniel’s Harbour area of the Great Northern Peninsula, northwestern Newfoundland. Both curves are similar, showing continuous emergence of 120-140 m between 14 700 cal BP and present. The half-life of exponential curves fit to the RSL data is 1400 years and the rate of emergence varies from ~2.3 m per century prior to 10 000 cal BP to ~0.13 m per century since 5000 cal BP. The curves fit a general pattern of RSL history along the west coast of Newfoundland, where there is a southward transition from solely emergence to emergence followed by submergence. Isostatic depression curves are generated for four RSL records spanning the west coast. Almost double the crustal depression is recorded to the northwest, reflecting the greater glacioisostatic loading by the Laurentide Ice Sheet over southern Labrador and Québec compared to a smaller loading centre by a regional ice complex over Newfoundland. Only the St. George’s Bay RSL record in the southwest appears to show evidence for a proglacial forebulge, when at 6000 cal BP an isostatic ridge of 4 m amplitude begins to collapse. Deux courbes du niveau marin relatif (NMR) sont présentées pour la région allant de Port-au-Choix à Daniel’s Harbour sur la Grande Péninsule Nord, au nord-ouest de Terre-Neuve. Les deux courbes sont semblables, montrant une émergence continue de 120 à 140 m entre 14 700 cal BP et l’actuel. La demi-vie des courbes exponentielles ajustées au NMR est de 1400 ans, et le taux d’émergence varie de ~2.3 m par siècle avant 10 000 cal BP à ~0.13 m par siècle depuis 5000 cal BP. Les courbes s’ajustent au modèle général de l’histoire du NMR de la côte ouest de Terre-Neuve, où il existe une transition d’émergence seule à une émergence suivie d’une submergence, en allant vers le sud. Des courbes de dépressions isostatiques préliminaires sont générées pour quatre chronologies du NMR couvrant la côte ouest. Presque le double de la dépression de la croûte est enregistré au ... |
format |
Text |
author |
Bell, Trevor Daly, Julia Batterson, Martin J. Liverman, David G.E. Shaw, John Smith, I. Rod |
spellingShingle |
Bell, Trevor Daly, Julia Batterson, Martin J. Liverman, David G.E. Shaw, John Smith, I. Rod Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland |
author_facet |
Bell, Trevor Daly, Julia Batterson, Martin J. Liverman, David G.E. Shaw, John Smith, I. Rod |
author_sort |
Bell, Trevor |
title |
Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland |
title_short |
Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland |
title_full |
Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland |
title_fullStr |
Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland |
title_full_unstemmed |
Late Quaternary Relative Sea-Level Change on the West Coast of Newfoundland |
title_sort |
late quaternary relative sea-level change on the west coast of newfoundland |
publisher |
Les Presses de l'Université de Montréal |
publishDate |
2005 |
url |
http://id.erudit.org/iderudit/014751ar https://doi.org/10.7202/014751ar |
long_lat |
ENVELOPE(-57.365,-57.365,50.717,50.717) |
geographic |
Newfoundland Port au Choix |
geographic_facet |
Newfoundland Port au Choix |
genre |
Ice Sheet Newfoundland Port au Choix Terre-Neuve |
genre_facet |
Ice Sheet Newfoundland Port au Choix Terre-Neuve |
op_relation |
Géographie physique et Quaternaire vol. 59 no. 2-3 (2005) http://id.erudit.org/iderudit/014751ar doi:10.7202/014751ar |
op_rights |
Tous droits réservés © Les Presses de l'Université de Montréal, 2007 |
op_doi |
https://doi.org/10.7202/014751ar |
container_title |
Géographie physique et Quaternaire |
container_volume |
59 |
container_issue |
2-3 |
container_start_page |
129 |
op_container_end_page |
140 |
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1766032025556353024 |