Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry
International audience 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 Arct...
Published in: | Canadian Journal of Earth Sciences |
---|---|
Main Authors: | , , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
|
Subjects: | |
Online Access: | https://hal.science/hal-03565940 https://doi.org/10.1139/cjes-2018-0085 |
id |
ftmuseumnhn:oai:HAL:hal-03565940v1 |
---|---|
record_format |
openpolar |
spelling |
ftmuseumnhn:oai:HAL:hal-03565940v1 2024-02-11T10:01:36+01:00 Strontium isotope geochemistry of modern and ancient archives: tracer of secular change in ocean chemistry Zaky, Amir Brand, Uwe Buhl, Dieter Blamey, Nigel Bitner, M. Aleksandra Logan, Alan Gaspard, Daniele Popov, Alexander Centre de Recherche en Paléontologie - Paris (CR2P) Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2019-03 https://hal.science/hal-03565940 https://doi.org/10.1139/cjes-2018-0085 en eng HAL CCSD National Research Council Canada info:eu-repo/semantics/altIdentifier/doi/10.1139/cjes-2018-0085 hal-03565940 https://hal.science/hal-03565940 doi:10.1139/cjes-2018-0085 ISSN: 0008-4077 EISSN: 1480-3313 Canadian journal of earth sciences https://hal.science/hal-03565940 Canadian journal of earth sciences, 2019, 56 (3), pp.245-264. ⟨10.1139/cjes-2018-0085⟩ [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology info:eu-repo/semantics/article Journal articles 2019 ftmuseumnhn https://doi.org/10.1139/cjes-2018-0085 2024-01-24T17:26:38Z International audience 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 Muséum National d'Histoire Naturelle (MNHM): HAL Arctic Indian Pacific Canadian Journal of Earth Sciences 56 3 245 264 |
institution |
Open Polar |
collection |
Muséum National d'Histoire Naturelle (MNHM): HAL |
op_collection_id |
ftmuseumnhn |
language |
English |
topic |
[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
spellingShingle |
[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Zaky, Amir 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 |
topic_facet |
[SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology |
description |
International audience 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. |
author2 |
Centre de Recherche en Paléontologie - Paris (CR2P) Muséum national d'Histoire naturelle (MNHN)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Zaky, Amir Brand, Uwe Buhl, Dieter Blamey, Nigel Bitner, M. Aleksandra Logan, Alan Gaspard, Daniele Popov, Alexander |
author_facet |
Zaky, Amir Brand, Uwe Buhl, Dieter Blamey, Nigel Bitner, M. Aleksandra Logan, Alan Gaspard, Daniele Popov, Alexander |
author_sort |
Zaky, Amir |
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 |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-03565940 https://doi.org/10.1139/cjes-2018-0085 |
geographic |
Arctic Indian Pacific |
geographic_facet |
Arctic Indian Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0008-4077 EISSN: 1480-3313 Canadian journal of earth sciences https://hal.science/hal-03565940 Canadian journal of earth sciences, 2019, 56 (3), pp.245-264. ⟨10.1139/cjes-2018-0085⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1139/cjes-2018-0085 hal-03565940 https://hal.science/hal-03565940 doi:10.1139/cjes-2018-0085 |
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_ |
1790597398292070400 |