Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events
Geochemical data from the Cape Phillips Formation, Arctic Canada, are examined in association with three Silurian biotic crises in the graptolite community; the early Wenlockian Ireviken, mid Wenlockian Cyrtograptus lundgreni, and end Wenlockian Colonograptus ludensis extinction events. Positive δ 1...
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crcansciencepubl:10.1139/e05-055 2023-12-17T10:25:23+01:00 Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events Noble, Paula J Zimmerman, Matthew K Holmden, Chris Lenz, Alfred C 2005 http://dx.doi.org/10.1139/e05-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-055 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 42, issue 8, page 1419-1430 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2005 crcansciencepubl https://doi.org/10.1139/e05-055 2023-11-19T13:39:32Z Geochemical data from the Cape Phillips Formation, Arctic Canada, are examined in association with three Silurian biotic crises in the graptolite community; the early Wenlockian Ireviken, mid Wenlockian Cyrtograptus lundgreni, and end Wenlockian Colonograptus ludensis extinction events. Positive δ 13 C org excursions are associated with the Ireviken and C. lundgreni events, but not the Co. ludensis Event. The Ireviken and C. lundgreni excursions are recognized worldwide and are herein interpreted to be the result of carbonate weathering in response to eustatic sea-level drop. The C. lundgreni excursion is of greater magnitude in the more proximal basin margin section at Abbott River, Cornwallis Island, and is explained by the amplification of a more strongly positive δ 13 C signature in shallower parts of an epeiric basin during increased exposure and weathering of the carbonate shelf. Excursion C5, within the C. praedeubeli C. deubeli Zone, is also of regional significance, as it occurs in both the Abbott River section and Twilight Creek section on Bathurst Island, and is also recognized in Estonia, Poland, and England. Excursion C6 is recognized in the Gorstian Stage, yet its regional significance remains equivocal. There is a reasonable general agreement between the shape of the δ 13 C org and δ 13 C carb curves, yet the δ 13 C carb curve is largely a record of detrital carbonate derived from the shelf. The δ 13 C org curve represents extraction of dissolved inorganic carbon by plankton and thus is more indicative of ambient paleoceanographic conditions. These data are valuable in that they provide a detailed secular marine δ 13 C curve for the Wenlockian of Arctic Canada from relatively unaltered sections of varying facies whose ages are well constrained by graptolite biostratigraphy. Article in Journal/Newspaper Arctic Bathurst Island Cornwallis Island Canadian Science Publishing (via Crossref) Arctic Canada Bathurst Island ENVELOPE(-100.002,-100.002,75.752,75.752) Cornwallis ENVELOPE(-54.464,-54.464,-61.072,-61.072) Abbott ENVELOPE(-62.133,-62.133,-64.100,-64.100) Cape Phillips ENVELOPE(-62.600,-62.600,-84.750,-84.750) Abbott River ENVELOPE(-95.968,-95.968,75.268,75.268) Twilight Creek ENVELOPE(-99.202,-99.202,76.185,76.185) Cornwallis Island ENVELOPE(-95.001,-95.001,75.135,75.135) Canadian Journal of Earth Sciences 42 8 1419 1430 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Noble, Paula J Zimmerman, Matthew K Holmden, Chris Lenz, Alfred C Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events |
topic_facet |
General Earth and Planetary Sciences |
description |
Geochemical data from the Cape Phillips Formation, Arctic Canada, are examined in association with three Silurian biotic crises in the graptolite community; the early Wenlockian Ireviken, mid Wenlockian Cyrtograptus lundgreni, and end Wenlockian Colonograptus ludensis extinction events. Positive δ 13 C org excursions are associated with the Ireviken and C. lundgreni events, but not the Co. ludensis Event. The Ireviken and C. lundgreni excursions are recognized worldwide and are herein interpreted to be the result of carbonate weathering in response to eustatic sea-level drop. The C. lundgreni excursion is of greater magnitude in the more proximal basin margin section at Abbott River, Cornwallis Island, and is explained by the amplification of a more strongly positive δ 13 C signature in shallower parts of an epeiric basin during increased exposure and weathering of the carbonate shelf. Excursion C5, within the C. praedeubeli C. deubeli Zone, is also of regional significance, as it occurs in both the Abbott River section and Twilight Creek section on Bathurst Island, and is also recognized in Estonia, Poland, and England. Excursion C6 is recognized in the Gorstian Stage, yet its regional significance remains equivocal. There is a reasonable general agreement between the shape of the δ 13 C org and δ 13 C carb curves, yet the δ 13 C carb curve is largely a record of detrital carbonate derived from the shelf. The δ 13 C org curve represents extraction of dissolved inorganic carbon by plankton and thus is more indicative of ambient paleoceanographic conditions. These data are valuable in that they provide a detailed secular marine δ 13 C curve for the Wenlockian of Arctic Canada from relatively unaltered sections of varying facies whose ages are well constrained by graptolite biostratigraphy. |
format |
Article in Journal/Newspaper |
author |
Noble, Paula J Zimmerman, Matthew K Holmden, Chris Lenz, Alfred C |
author_facet |
Noble, Paula J Zimmerman, Matthew K Holmden, Chris Lenz, Alfred C |
author_sort |
Noble, Paula J |
title |
Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events |
title_short |
Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events |
title_full |
Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events |
title_fullStr |
Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events |
title_full_unstemmed |
Early Silurian (Wenlockian) δ 13 C profiles from the Cape Phillips Formation, Arctic Canada and their relation to biotic events |
title_sort |
early silurian (wenlockian) δ 13 c profiles from the cape phillips formation, arctic canada and their relation to biotic events |
publisher |
Canadian Science Publishing |
publishDate |
2005 |
url |
http://dx.doi.org/10.1139/e05-055 http://www.nrcresearchpress.com/doi/pdf/10.1139/e05-055 |
long_lat |
ENVELOPE(-100.002,-100.002,75.752,75.752) ENVELOPE(-54.464,-54.464,-61.072,-61.072) ENVELOPE(-62.133,-62.133,-64.100,-64.100) ENVELOPE(-62.600,-62.600,-84.750,-84.750) ENVELOPE(-95.968,-95.968,75.268,75.268) ENVELOPE(-99.202,-99.202,76.185,76.185) ENVELOPE(-95.001,-95.001,75.135,75.135) |
geographic |
Arctic Canada Bathurst Island Cornwallis Abbott Cape Phillips Abbott River Twilight Creek Cornwallis Island |
geographic_facet |
Arctic Canada Bathurst Island Cornwallis Abbott Cape Phillips Abbott River Twilight Creek Cornwallis Island |
genre |
Arctic Bathurst Island Cornwallis Island |
genre_facet |
Arctic Bathurst Island Cornwallis Island |
op_source |
Canadian Journal of Earth Sciences volume 42, issue 8, page 1419-1430 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e05-055 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
42 |
container_issue |
8 |
container_start_page |
1419 |
op_container_end_page |
1430 |
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1785576271249408000 |