Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry
Strontium isotopes of marine archives provide a significant means for tracing physical and chemical processes operating over geologic time. Modern articulated brachiopods and halite samples were collected from all depths of the world’s main water bodies. Material from the Arctic, North and South Atl...
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crcansciencepubl:10.1139/cjes-2018-0085 2024-06-23T07:50:39+00:00 Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry Zaky, Amir H. Brand, Uwe Buhl, Dieter Blamey, Nigel Bitner, M. Aleksandra Logan, Alan Gaspard, Daniele Popov, Alexander 2019 http://dx.doi.org/10.1139/cjes-2018-0085 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2018-0085 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2018-0085 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 56, issue 3, page 245-264 ISSN 0008-4077 1480-3313 journal-article 2019 crcansciencepubl https://doi.org/10.1139/cjes-2018-0085 2024-06-13T04:10:48Z Strontium isotopes of marine archives provide a significant means for tracing physical and chemical processes operating over geologic time. Modern articulated brachiopods and halite samples were collected from all depths of the world’s main water bodies. Material from the Arctic, North and South Atlantic, North and South Pacific, Indian and Southern oceans, as well as Caribbean and Mediterranean seas provide baseline parameters for diagenetic screening and reconstruction of seawater curves. The Sr isotopic ratio of modern brachiopods is unobscured by latitude, depth, and biologic factors (Order, valves, and shell segment). However, there is a small but significant impact of external sources reflected by salinity and temperature on the Sr isotope ratio of modern brachiopods. We found a significant difference in 87 Sr/ 86 Sr of brachiopods from polar and temperate-tropical habitats (p = 0.001), which should be considered when working with deep-time archives. The average 87 Sr/ 86 Sr value of all our modern shells (0.709160 ± 0.000019; N = 95) and halite (0.709153) is similar to values measured for modern seawater (0.710167 ± 0.000009; p = 0.118). The radiogenic Sr content of present-day seawater does not vary significantly, and modern biogenic-calcite 87 Sr/ 86 Sr ranges from 0.709126 to 0.709233 with a fluctuation of about ±0.000054. With the most rigorous diagenetic evaluations and stratigraphic assignment of deep-time samples, and applying the Sr isotope fluctuation recorded by modern biogenic calcite to ancient carbonates and a 1 Myr interval, reconstructions resulted in a seawater- 87 Sr curve with greater details during the Phanerozoic and Neoproterozoic. Article in Journal/Newspaper Arctic Canadian Science Publishing Arctic Indian Pacific Canadian Journal of Earth Sciences 56 3 245 264 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Strontium isotopes of marine archives provide a significant means for tracing physical and chemical processes operating over geologic time. Modern articulated brachiopods and halite samples were collected from all depths of the world’s main water bodies. Material from the Arctic, North and South Atlantic, North and South Pacific, Indian and Southern oceans, as well as Caribbean and Mediterranean seas provide baseline parameters for diagenetic screening and reconstruction of seawater curves. The Sr isotopic ratio of modern brachiopods is unobscured by latitude, depth, and biologic factors (Order, valves, and shell segment). However, there is a small but significant impact of external sources reflected by salinity and temperature on the Sr isotope ratio of modern brachiopods. We found a significant difference in 87 Sr/ 86 Sr of brachiopods from polar and temperate-tropical habitats (p = 0.001), which should be considered when working with deep-time archives. The average 87 Sr/ 86 Sr value of all our modern shells (0.709160 ± 0.000019; N = 95) and halite (0.709153) is similar to values measured for modern seawater (0.710167 ± 0.000009; p = 0.118). The radiogenic Sr content of present-day seawater does not vary significantly, and modern biogenic-calcite 87 Sr/ 86 Sr ranges from 0.709126 to 0.709233 with a fluctuation of about ±0.000054. With the most rigorous diagenetic evaluations and stratigraphic assignment of deep-time samples, and applying the Sr isotope fluctuation recorded by modern biogenic calcite to ancient carbonates and a 1 Myr interval, reconstructions resulted in a seawater- 87 Sr curve with greater details during the Phanerozoic and Neoproterozoic. |
format |
Article in Journal/Newspaper |
author |
Zaky, Amir H. Brand, Uwe Buhl, Dieter Blamey, Nigel Bitner, M. Aleksandra Logan, Alan Gaspard, Daniele Popov, Alexander |
spellingShingle |
Zaky, Amir H. Brand, Uwe Buhl, Dieter Blamey, Nigel Bitner, M. Aleksandra Logan, Alan Gaspard, Daniele Popov, Alexander Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry |
author_facet |
Zaky, Amir H. Brand, Uwe Buhl, Dieter Blamey, Nigel Bitner, M. Aleksandra Logan, Alan Gaspard, Daniele Popov, Alexander |
author_sort |
Zaky, Amir H. |
title |
Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry |
title_short |
Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry |
title_full |
Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry |
title_fullStr |
Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry |
title_full_unstemmed |
Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry |
title_sort |
strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry |
publisher |
Canadian Science Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1139/cjes-2018-0085 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2018-0085 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2018-0085 |
geographic |
Arctic Indian Pacific |
geographic_facet |
Arctic Indian Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Canadian Journal of Earth Sciences volume 56, issue 3, page 245-264 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2018-0085 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
56 |
container_issue |
3 |
container_start_page |
245 |
op_container_end_page |
264 |
_version_ |
1802641566431444992 |