First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications
The most prominent of the two major global δ 13 C excursions in the Ordovician, the Hirnantian δ 13 C excursion (HICE), which is previously recorded from the uppermost Ordovician in a few sections in Nevada, Quebec, Arctic Canada, Baltoscandia, Scotland and China, is documented for the first time fr...
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crcambridgeupr:10.1017/s0016756806002469 2024-05-12T08:00:07+00:00 First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications BERGSTRÖM, STIG M. SALTZMAN, MATTHEW M. SCHMITZ, BIRGER 2006 http://dx.doi.org/10.1017/s0016756806002469 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756806002469 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 143, issue 5, page 657-678 ISSN 0016-7568 1469-5081 Geology journal-article 2006 crcambridgeupr https://doi.org/10.1017/s0016756806002469 2024-04-18T06:54:09Z The most prominent of the two major global δ 13 C excursions in the Ordovician, the Hirnantian δ 13 C excursion (HICE), which is previously recorded from the uppermost Ordovician in a few sections in Nevada, Quebec, Arctic Canada, Baltoscandia, Scotland and China, is documented for the first time from the North American Midcontinent. Samples through the Girardeau Limestone and Leemon Formation in Missouri and Illinois show elevated δ 13 C values of +4‰ to +5‰. Although not determined precisely, the beginning of the HICE is likely to be in the upper part of the Orchard Creek Shale, and it ends in the upper Leemon Formation. Being extraordinarily useful chronostratigraphically, the presence of the HICE makes it possible to provide a firm dating of the study interval, whose age has long been controversial. Comparison between the study sections and coeval HICE sequences in North America and Europe show striking similarities, especially in sea-level history, indicating that major local lowstands reflect eustatic sea-level changes. A comparison with Hirnantian diamictite successions in North and South Africa and Argentina suggests that these lowstands correspond to two major Gondwanan glacial episodes. Article in Journal/Newspaper Arctic Cambridge University Press Arctic Canada Argentina Geological Magazine 143 5 657 678 |
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Cambridge University Press |
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English |
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Geology |
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Geology BERGSTRÖM, STIG M. SALTZMAN, MATTHEW M. SCHMITZ, BIRGER First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications |
topic_facet |
Geology |
description |
The most prominent of the two major global δ 13 C excursions in the Ordovician, the Hirnantian δ 13 C excursion (HICE), which is previously recorded from the uppermost Ordovician in a few sections in Nevada, Quebec, Arctic Canada, Baltoscandia, Scotland and China, is documented for the first time from the North American Midcontinent. Samples through the Girardeau Limestone and Leemon Formation in Missouri and Illinois show elevated δ 13 C values of +4‰ to +5‰. Although not determined precisely, the beginning of the HICE is likely to be in the upper part of the Orchard Creek Shale, and it ends in the upper Leemon Formation. Being extraordinarily useful chronostratigraphically, the presence of the HICE makes it possible to provide a firm dating of the study interval, whose age has long been controversial. Comparison between the study sections and coeval HICE sequences in North America and Europe show striking similarities, especially in sea-level history, indicating that major local lowstands reflect eustatic sea-level changes. A comparison with Hirnantian diamictite successions in North and South Africa and Argentina suggests that these lowstands correspond to two major Gondwanan glacial episodes. |
format |
Article in Journal/Newspaper |
author |
BERGSTRÖM, STIG M. SALTZMAN, MATTHEW M. SCHMITZ, BIRGER |
author_facet |
BERGSTRÖM, STIG M. SALTZMAN, MATTHEW M. SCHMITZ, BIRGER |
author_sort |
BERGSTRÖM, STIG M. |
title |
First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications |
title_short |
First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications |
title_full |
First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications |
title_fullStr |
First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications |
title_full_unstemmed |
First record of the Hirnantian (Upper Ordovician) δ 13 C excursion in the North American Midcontinent and its regional implications |
title_sort |
first record of the hirnantian (upper ordovician) δ 13 c excursion in the north american midcontinent and its regional implications |
publisher |
Cambridge University Press (CUP) |
publishDate |
2006 |
url |
http://dx.doi.org/10.1017/s0016756806002469 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756806002469 |
geographic |
Arctic Canada Argentina |
geographic_facet |
Arctic Canada Argentina |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Geological Magazine volume 143, issue 5, page 657-678 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756806002469 |
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143 |
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657 |
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1798841824476921856 |