Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada
A new carbon isotope record for two high-latitude sedimentary successions that span the Jurassic-Cretaceous boundary interval in the Sverdrup Basin of Arctic Canada is presented. This study, combined with other published Arctic data, shows a large negative isotopic excursion of organic carbon (δ 13...
Published in: | Geological Magazine |
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2020
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Online Access: | https://curis.ku.dk/portal/da/publications/finding-the-voice(2b0f9da9-f2bc-4091-a003-bfe12fa26ce3).html https://doi.org/10.1017/S0016756819001316 https://curis.ku.dk/ws/files/287609652/Galloway_etal_2019_4_18.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/2b0f9da9-f2bc-4091-a003-bfe12fa26ce3 2024-04-21T07:53:43+00:00 Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada Galloway, Jennifer Margaret Vickers, Madeleine L. Price, Gregory D. Poulton, Terence Grasby, Stephen E. Hadlari, Thomas Beauchamp, Benoit Sulphur, Kyle 2020-01-01 application/pdf https://curis.ku.dk/portal/da/publications/finding-the-voice(2b0f9da9-f2bc-4091-a003-bfe12fa26ce3).html https://doi.org/10.1017/S0016756819001316 https://curis.ku.dk/ws/files/287609652/Galloway_etal_2019_4_18.pdf eng eng info:eu-repo/semantics/openAccess Galloway , J M , Vickers , M L , Price , G D , Poulton , T , Grasby , S E , Hadlari , T , Beauchamp , B & Sulphur , K 2020 , ' Finding the VOICE : organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada ' , Geological Magazine , vol. 157 , no. 10 , pp. 1643-1657 . https://doi.org/10.1017/S0016756819001316 Arctic Canada carbon isotopes Jurassic-Cretaceous article 2020 ftcopenhagenunip https://doi.org/10.1017/S0016756819001316 2024-03-28T01:21:45Z A new carbon isotope record for two high-latitude sedimentary successions that span the Jurassic-Cretaceous boundary interval in the Sverdrup Basin of Arctic Canada is presented. This study, combined with other published Arctic data, shows a large negative isotopic excursion of organic carbon (δ 13 C org ) of 4‰ (V-PDB) and to a minimum of-30.7‰ in the probable middle Volgian Stage. This is followed by a return to less negative values of c.-27‰. A smaller positive excursion in the Valanginian Stage of c. 2‰, reaching maximum values of-24.6‰, is related to the Weissert Event. The Volgian isotopic trends are consistent with other high-latitude records but do not appear in δ 13 C carb records of Tethyan Tithonian strata. In the absence of any obvious definitive cause for the depleted δ 13 C org anomaly, we suggest several possible contributing factors. The Sverdrup Basin and other Arctic areas may have experienced compositional evolution away from open-marine δ 13 C values during the Volgian Age due to low global or large-scale regional sea levels, and later become effectively coupled to global oceans by Valanginian time when sea level rose. A geologically sudden increase in volcanism may have caused the large negative δ 13 C org values seen in the Arctic Volgian records but the lack of precise geochronological age control for the Jurassic-Cretaceous boundary precludes direct comparison with potentially coincident events, such as the Shatsky Rise. This study offers improved correlation constraints and a refined C-isotope curve for the Boreal region throughout latest Jurassic and earliest Cretaceous time. Article in Journal/Newspaper Arctic sverdrup basin University of Copenhagen: Research Geological Magazine 157 10 1643 1657 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Arctic Canada carbon isotopes Jurassic-Cretaceous |
spellingShingle |
Arctic Canada carbon isotopes Jurassic-Cretaceous Galloway, Jennifer Margaret Vickers, Madeleine L. Price, Gregory D. Poulton, Terence Grasby, Stephen E. Hadlari, Thomas Beauchamp, Benoit Sulphur, Kyle Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada |
topic_facet |
Arctic Canada carbon isotopes Jurassic-Cretaceous |
description |
A new carbon isotope record for two high-latitude sedimentary successions that span the Jurassic-Cretaceous boundary interval in the Sverdrup Basin of Arctic Canada is presented. This study, combined with other published Arctic data, shows a large negative isotopic excursion of organic carbon (δ 13 C org ) of 4‰ (V-PDB) and to a minimum of-30.7‰ in the probable middle Volgian Stage. This is followed by a return to less negative values of c.-27‰. A smaller positive excursion in the Valanginian Stage of c. 2‰, reaching maximum values of-24.6‰, is related to the Weissert Event. The Volgian isotopic trends are consistent with other high-latitude records but do not appear in δ 13 C carb records of Tethyan Tithonian strata. In the absence of any obvious definitive cause for the depleted δ 13 C org anomaly, we suggest several possible contributing factors. The Sverdrup Basin and other Arctic areas may have experienced compositional evolution away from open-marine δ 13 C values during the Volgian Age due to low global or large-scale regional sea levels, and later become effectively coupled to global oceans by Valanginian time when sea level rose. A geologically sudden increase in volcanism may have caused the large negative δ 13 C org values seen in the Arctic Volgian records but the lack of precise geochronological age control for the Jurassic-Cretaceous boundary precludes direct comparison with potentially coincident events, such as the Shatsky Rise. This study offers improved correlation constraints and a refined C-isotope curve for the Boreal region throughout latest Jurassic and earliest Cretaceous time. |
format |
Article in Journal/Newspaper |
author |
Galloway, Jennifer Margaret Vickers, Madeleine L. Price, Gregory D. Poulton, Terence Grasby, Stephen E. Hadlari, Thomas Beauchamp, Benoit Sulphur, Kyle |
author_facet |
Galloway, Jennifer Margaret Vickers, Madeleine L. Price, Gregory D. Poulton, Terence Grasby, Stephen E. Hadlari, Thomas Beauchamp, Benoit Sulphur, Kyle |
author_sort |
Galloway, Jennifer Margaret |
title |
Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada |
title_short |
Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada |
title_full |
Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada |
title_fullStr |
Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada |
title_full_unstemmed |
Finding the VOICE:organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada |
title_sort |
finding the voice:organic carbon isotope chemostratigraphy of late jurassic-early cretaceous arctic canada |
publishDate |
2020 |
url |
https://curis.ku.dk/portal/da/publications/finding-the-voice(2b0f9da9-f2bc-4091-a003-bfe12fa26ce3).html https://doi.org/10.1017/S0016756819001316 https://curis.ku.dk/ws/files/287609652/Galloway_etal_2019_4_18.pdf |
genre |
Arctic sverdrup basin |
genre_facet |
Arctic sverdrup basin |
op_source |
Galloway , J M , Vickers , M L , Price , G D , Poulton , T , Grasby , S E , Hadlari , T , Beauchamp , B & Sulphur , K 2020 , ' Finding the VOICE : organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada ' , Geological Magazine , vol. 157 , no. 10 , pp. 1643-1657 . https://doi.org/10.1017/S0016756819001316 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/S0016756819001316 |
container_title |
Geological Magazine |
container_volume |
157 |
container_issue |
10 |
container_start_page |
1643 |
op_container_end_page |
1657 |
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1796936699794685952 |