Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England
Abstract Carbonate rocks have been sampled through predominantly siliciclastic sediments above the Precambrian-Cambrian global stratotype level in southeastern Newfoundland to assess their potential for oxygen and carbon isotope stratigraphy. Comparable successions were sampled at Nuneaton and Comle...
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Cambridge University Press (CUP)
1992
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Online Access: | http://dx.doi.org/10.1017/s001675680001921x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S001675680001921X |
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crcambridgeupr:10.1017/s001675680001921x 2024-05-19T07:44:14+00:00 Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England Brasier, M. D. Anderson, M. M. Corfield, R. M. 1992 http://dx.doi.org/10.1017/s001675680001921x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S001675680001921X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 129, issue 3, page 265-279 ISSN 0016-7568 1469-5081 journal-article 1992 crcambridgeupr https://doi.org/10.1017/s001675680001921x 2024-04-25T06:51:20Z Abstract Carbonate rocks have been sampled through predominantly siliciclastic sediments above the Precambrian-Cambrian global stratotype level in southeastern Newfoundland to assess their potential for oxygen and carbon isotope stratigraphy. Comparable successions were sampled at Nuneaton and Comley in England. Greatly depleted δ 18 O signals are attributed to widespread thermal alteration during deep burial and granitic intrusion, including within the stratotype region. Carbon isotope ratios appear to have been less affected and these are described from nine sections. A provisional, composite δ 13 C curve is based on non-ferroan, pink nodular and bedded micrites. Several δ 13 C excursions occur in the fossiliferous Bonavista Group and allow the position of the Tommotian-Atdabanian boundary to be identified. Chemostratigraphic correlation of the new Precambrian-Cambrian boundary stratotype may, however, prove difficult because of the lack of suitable, well-preserved carbonates. The search must begin for a comparable reference section allowing global correlation of the boundary level using chemostratigraphy as well as biostratigraphy. Article in Journal/Newspaper Newfoundland Cambridge University Press Geological Magazine 129 3 265 279 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Carbonate rocks have been sampled through predominantly siliciclastic sediments above the Precambrian-Cambrian global stratotype level in southeastern Newfoundland to assess their potential for oxygen and carbon isotope stratigraphy. Comparable successions were sampled at Nuneaton and Comley in England. Greatly depleted δ 18 O signals are attributed to widespread thermal alteration during deep burial and granitic intrusion, including within the stratotype region. Carbon isotope ratios appear to have been less affected and these are described from nine sections. A provisional, composite δ 13 C curve is based on non-ferroan, pink nodular and bedded micrites. Several δ 13 C excursions occur in the fossiliferous Bonavista Group and allow the position of the Tommotian-Atdabanian boundary to be identified. Chemostratigraphic correlation of the new Precambrian-Cambrian boundary stratotype may, however, prove difficult because of the lack of suitable, well-preserved carbonates. The search must begin for a comparable reference section allowing global correlation of the boundary level using chemostratigraphy as well as biostratigraphy. |
format |
Article in Journal/Newspaper |
author |
Brasier, M. D. Anderson, M. M. Corfield, R. M. |
spellingShingle |
Brasier, M. D. Anderson, M. M. Corfield, R. M. Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England |
author_facet |
Brasier, M. D. Anderson, M. M. Corfield, R. M. |
author_sort |
Brasier, M. D. |
title |
Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England |
title_short |
Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England |
title_full |
Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England |
title_fullStr |
Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England |
title_full_unstemmed |
Oxygen and carbon isotope stratigraphy of early Cambrian carbonates in southeastern Newfoundland and England |
title_sort |
oxygen and carbon isotope stratigraphy of early cambrian carbonates in southeastern newfoundland and england |
publisher |
Cambridge University Press (CUP) |
publishDate |
1992 |
url |
http://dx.doi.org/10.1017/s001675680001921x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S001675680001921X |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Geological Magazine volume 129, issue 3, page 265-279 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s001675680001921x |
container_title |
Geological Magazine |
container_volume |
129 |
container_issue |
3 |
container_start_page |
265 |
op_container_end_page |
279 |
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1799483998015062016 |