Finding the VOICE: organic carbon isotope chemostratigraphy of Late Jurassic – Early Cretaceous Arctic Canada
Abstract 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 carb...
Published in: | Geological Magazine |
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Language: | English |
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Cambridge University Press (CUP)
2019
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Online Access: | http://dx.doi.org/10.1017/s0016756819001316 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756819001316 |
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crcambridgeupr:10.1017/s0016756819001316 2024-09-30T14:29:48+00:00 Finding the VOICE: organic carbon isotope chemostratigraphy of Late Jurassic – Early Cretaceous Arctic Canada Galloway, Jennifer M. Vickers, Madeleine L. Price, Gregory D. Poulton, Terence Grasby, Stephen E. Hadlari, Thomas Beauchamp, Benoit Sulphur, Kyle 2019 http://dx.doi.org/10.1017/s0016756819001316 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756819001316 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 157, issue 10, page 1643-1657 ISSN 0016-7568 1469-5081 journal-article 2019 crcambridgeupr https://doi.org/10.1017/s0016756819001316 2024-09-04T04:03:24Z Abstract 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 Cambridge University Press Arctic Canada Geological Magazine 157 10 1643 1657 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract 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 M. Vickers, Madeleine L. Price, Gregory D. Poulton, Terence Grasby, Stephen E. Hadlari, Thomas Beauchamp, Benoit Sulphur, Kyle |
spellingShingle |
Galloway, Jennifer M. 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 |
author_facet |
Galloway, Jennifer M. Vickers, Madeleine L. Price, Gregory D. Poulton, Terence Grasby, Stephen E. Hadlari, Thomas Beauchamp, Benoit Sulphur, Kyle |
author_sort |
Galloway, Jennifer M. |
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 |
publisher |
Cambridge University Press (CUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1017/s0016756819001316 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756819001316 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic sverdrup basin |
genre_facet |
Arctic sverdrup basin |
op_source |
Geological Magazine volume 157, issue 10, page 1643-1657 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
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 |
_version_ |
1811635011262087168 |