The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank
Elevated topography is evident across the continental margins of the Atlantic. The Cumberland Peninsula, Baffin Island, formed as the result of rifting along the Labrador–Baffin margins in the late Mesozoic and is dominated by low-relief high-elevation topography. Apatite fission-track (AFT) analysi...
Published in: | Journal of the Geological Society |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of London
2019
|
Subjects: | |
Online Access: | http://eprints.gla.ac.uk/187356/ http://eprints.gla.ac.uk/187356/1/187356.pdf |
id |
ftuglasgow:oai:eprints.gla.ac.uk:187356 |
---|---|
record_format |
openpolar |
spelling |
ftuglasgow:oai:eprints.gla.ac.uk:187356 2023-05-15T14:26:52+02:00 The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank Jess, Scott Stephenson, Randall Nielsen, Soren Brown, Roderick 2019-11 text http://eprints.gla.ac.uk/187356/ http://eprints.gla.ac.uk/187356/1/187356.pdf en eng Geological Society of London http://eprints.gla.ac.uk/187356/1/187356.pdf Jess, S., Stephenson, R., Nielsen, S. and Brown, R. <http://eprints.gla.ac.uk/view/author/10251.html> (2019) The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank. Journal of the Geological Society <http://eprints.gla.ac.uk/view/journal_volume/Journal_of_the_Geological_Society.html>, 176(6), pp. 1093-1106. (doi:10.1144/jgs2018-211 <http://dx.doi.org/10.1144/jgs2018-211>) cc_by_4 CC-BY Articles PeerReviewed 2019 ftuglasgow https://doi.org/10.1144/jgs2018-211 2020-12-03T23:09:06Z Elevated topography is evident across the continental margins of the Atlantic. The Cumberland Peninsula, Baffin Island, formed as the result of rifting along the Labrador–Baffin margins in the late Mesozoic and is dominated by low-relief high-elevation topography. Apatite fission-track (AFT) analysis of the landscape previously concluded that the area has experienced a differential protracted cooling regime since the Devonian; however, defined periods of cooling and the direct causes of exhumation were unresolved. This work combines the original AFT data with 98 apatite new (U–Th)/He (AHe) ages from 16 samples and applies the newly developed ‘broken crystals’ technique to provide a greater number of thermal constraints for thermal history modelling to better constrain the topographic evolution. The spatial distribution of AFT and AHe ages implies that exhumation has been significant toward the SE (Labrador) coastline, and results of thermal modelling outline three notable periods of cooling: in the pre-rift stage (460–200 Ma), from synrift stage to present (120–0 Ma) and within the post-rift stage (30–0 Ma). Pre-rift cooling is interpreted as the result of exhumation of Laurentia and synrift cooling as the result of rift-flank uplift to the SE and differential erosion of landscape, whereas the final post-rift period is probably an artefact of the modelling process. These results suggest that the source of the Cumberland Peninsula's modern-day elevated topography is uplift during rifting in the Cretaceous and the isostatic compensation following continuous Mesozoic and Cenozoic differential erosion. This work highlights how interaction of rift tectonics and isostasy can be the principal source for modern elevated continental margins, and also provides insight into the pre-rift exhumational history of central Laurentia. Article in Journal/Newspaper Arctic Arctic Baffin Island Baffin Cumberland Peninsula North Atlantic University of Glasgow: Enlighten - Publications Arctic Baffin Island Canada Cumberland Peninsula ENVELOPE(-64.497,-64.497,66.501,66.501) Journal of the Geological Society 176 6 1093 1106 |
institution |
Open Polar |
collection |
University of Glasgow: Enlighten - Publications |
op_collection_id |
ftuglasgow |
language |
English |
description |
Elevated topography is evident across the continental margins of the Atlantic. The Cumberland Peninsula, Baffin Island, formed as the result of rifting along the Labrador–Baffin margins in the late Mesozoic and is dominated by low-relief high-elevation topography. Apatite fission-track (AFT) analysis of the landscape previously concluded that the area has experienced a differential protracted cooling regime since the Devonian; however, defined periods of cooling and the direct causes of exhumation were unresolved. This work combines the original AFT data with 98 apatite new (U–Th)/He (AHe) ages from 16 samples and applies the newly developed ‘broken crystals’ technique to provide a greater number of thermal constraints for thermal history modelling to better constrain the topographic evolution. The spatial distribution of AFT and AHe ages implies that exhumation has been significant toward the SE (Labrador) coastline, and results of thermal modelling outline three notable periods of cooling: in the pre-rift stage (460–200 Ma), from synrift stage to present (120–0 Ma) and within the post-rift stage (30–0 Ma). Pre-rift cooling is interpreted as the result of exhumation of Laurentia and synrift cooling as the result of rift-flank uplift to the SE and differential erosion of landscape, whereas the final post-rift period is probably an artefact of the modelling process. These results suggest that the source of the Cumberland Peninsula's modern-day elevated topography is uplift during rifting in the Cretaceous and the isostatic compensation following continuous Mesozoic and Cenozoic differential erosion. This work highlights how interaction of rift tectonics and isostasy can be the principal source for modern elevated continental margins, and also provides insight into the pre-rift exhumational history of central Laurentia. |
format |
Article in Journal/Newspaper |
author |
Jess, Scott Stephenson, Randall Nielsen, Soren Brown, Roderick |
spellingShingle |
Jess, Scott Stephenson, Randall Nielsen, Soren Brown, Roderick The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank |
author_facet |
Jess, Scott Stephenson, Randall Nielsen, Soren Brown, Roderick |
author_sort |
Jess, Scott |
title |
The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank |
title_short |
The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank |
title_full |
The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank |
title_fullStr |
The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank |
title_full_unstemmed |
The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank |
title_sort |
source of topography across the cumberland peninsula, baffin island, arctic canada: differential exhumation of a north atlantic rift flank |
publisher |
Geological Society of London |
publishDate |
2019 |
url |
http://eprints.gla.ac.uk/187356/ http://eprints.gla.ac.uk/187356/1/187356.pdf |
long_lat |
ENVELOPE(-64.497,-64.497,66.501,66.501) |
geographic |
Arctic Baffin Island Canada Cumberland Peninsula |
geographic_facet |
Arctic Baffin Island Canada Cumberland Peninsula |
genre |
Arctic Arctic Baffin Island Baffin Cumberland Peninsula North Atlantic |
genre_facet |
Arctic Arctic Baffin Island Baffin Cumberland Peninsula North Atlantic |
op_relation |
http://eprints.gla.ac.uk/187356/1/187356.pdf Jess, S., Stephenson, R., Nielsen, S. and Brown, R. <http://eprints.gla.ac.uk/view/author/10251.html> (2019) The source of topography across the Cumberland Peninsula, Baffin Island, Arctic Canada: differential exhumation of a North Atlantic rift flank. Journal of the Geological Society <http://eprints.gla.ac.uk/view/journal_volume/Journal_of_the_Geological_Society.html>, 176(6), pp. 1093-1106. (doi:10.1144/jgs2018-211 <http://dx.doi.org/10.1144/jgs2018-211>) |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1144/jgs2018-211 |
container_title |
Journal of the Geological Society |
container_volume |
176 |
container_issue |
6 |
container_start_page |
1093 |
op_container_end_page |
1106 |
_version_ |
1766300322095955968 |