Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section
Abstract The δ 13 C profile from the lower interval of the Martin Point section in western Newfoundland (Canada) spans the Upper Cambrian (uppermost Franconian – lowermost Trempealeauan). The investigated interval (∼110 m) is a part of the Green Point Formation of the Cow Head Group and consists of...
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crcambridgeupr:10.1017/s0016756818000638 2024-06-23T07:54:48+00:00 Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section Azmy, Karem 2018 http://dx.doi.org/10.1017/s0016756818000638 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756818000638 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 156, issue 08, page 1311-1322 ISSN 0016-7568 1469-5081 journal-article 2018 crcambridgeupr https://doi.org/10.1017/s0016756818000638 2024-06-12T04:02:51Z Abstract The δ 13 C profile from the lower interval of the Martin Point section in western Newfoundland (Canada) spans the Upper Cambrian (uppermost Franconian – lowermost Trempealeauan). The investigated interval (∼110 m) is a part of the Green Point Formation of the Cow Head Group and consists of the upper part of the Tucker Cove Member (topmost part of the Shallow Bay Formation) and the lowermost part of the Martin Point Member (bottom of the Green Point Formation). It is formed of rhythmites of marine carbonates alternating with shales and minor conglomeratic interbeds. Multiscreening petrographic and geochemical techniques have been utilized to evaluate the preservation of the investigated lime mudstones. The δ 13 C and δ 18 O values of the sampled micrites (−4.8 ‰ to +1.0 ‰ VPDB and −8.2 ‰ to −5.3 ‰ VPDB, respectively) have insignificant correlation (R 2 = 0.01), as similarly do the δ 13 C values with their Sr counterparts (R 2 = 0.07), which supports the preservation of at least near-primary δ 13 C signatures that can be utilized to construct a reliable high-resolution carbon-isotope profile for global correlations. The δ 13 C profile exhibits two main negative excursions: a lower excursion (∼4 ‰) that reaches its maximum at the bottom of the section and an upper narrow excursion (∼6 ‰) immediately above the boundary of the Tucker Cove/Martin Point members (Shallow Bay Formation – Green Point Formation boundary). The lower excursion may be correlated with the global SPICE event, whereas the upper excursion may match with a post-SPICE event that has been also recognized in profiles of equivalent sections on different palaeocontinents. Article in Journal/Newspaper Newfoundland Cambridge University Press Canada Cow Head ENVELOPE(-57.832,-57.832,49.917,49.917) Shallow Bay ENVELOPE(67.467,67.467,-67.817,-67.817) Green Point ENVELOPE(73.350,73.350,-53.083,-53.083) Martin Point ENVELOPE(-44.683,-44.683,-60.767,-60.767) Geological Magazine 156 08 1311 1322 |
institution |
Open Polar |
collection |
Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract The δ 13 C profile from the lower interval of the Martin Point section in western Newfoundland (Canada) spans the Upper Cambrian (uppermost Franconian – lowermost Trempealeauan). The investigated interval (∼110 m) is a part of the Green Point Formation of the Cow Head Group and consists of the upper part of the Tucker Cove Member (topmost part of the Shallow Bay Formation) and the lowermost part of the Martin Point Member (bottom of the Green Point Formation). It is formed of rhythmites of marine carbonates alternating with shales and minor conglomeratic interbeds. Multiscreening petrographic and geochemical techniques have been utilized to evaluate the preservation of the investigated lime mudstones. The δ 13 C and δ 18 O values of the sampled micrites (−4.8 ‰ to +1.0 ‰ VPDB and −8.2 ‰ to −5.3 ‰ VPDB, respectively) have insignificant correlation (R 2 = 0.01), as similarly do the δ 13 C values with their Sr counterparts (R 2 = 0.07), which supports the preservation of at least near-primary δ 13 C signatures that can be utilized to construct a reliable high-resolution carbon-isotope profile for global correlations. The δ 13 C profile exhibits two main negative excursions: a lower excursion (∼4 ‰) that reaches its maximum at the bottom of the section and an upper narrow excursion (∼6 ‰) immediately above the boundary of the Tucker Cove/Martin Point members (Shallow Bay Formation – Green Point Formation boundary). The lower excursion may be correlated with the global SPICE event, whereas the upper excursion may match with a post-SPICE event that has been also recognized in profiles of equivalent sections on different palaeocontinents. |
format |
Article in Journal/Newspaper |
author |
Azmy, Karem |
spellingShingle |
Azmy, Karem Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section |
author_facet |
Azmy, Karem |
author_sort |
Azmy, Karem |
title |
Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section |
title_short |
Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section |
title_full |
Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section |
title_fullStr |
Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section |
title_full_unstemmed |
Carbon-isotope stratigraphy of the SPICE event (Upper Cambrian) in eastern Laurentia: implications for global correlation and a potential reference section |
title_sort |
carbon-isotope stratigraphy of the spice event (upper cambrian) in eastern laurentia: implications for global correlation and a potential reference section |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/s0016756818000638 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756818000638 |
long_lat |
ENVELOPE(-57.832,-57.832,49.917,49.917) ENVELOPE(67.467,67.467,-67.817,-67.817) ENVELOPE(73.350,73.350,-53.083,-53.083) ENVELOPE(-44.683,-44.683,-60.767,-60.767) |
geographic |
Canada Cow Head Shallow Bay Green Point Martin Point |
geographic_facet |
Canada Cow Head Shallow Bay Green Point Martin Point |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Geological Magazine volume 156, issue 08, page 1311-1322 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756818000638 |
container_title |
Geological Magazine |
container_volume |
156 |
container_issue |
08 |
container_start_page |
1311 |
op_container_end_page |
1322 |
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1802647073954201600 |