The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic
Abstract Calcium isotopes (δ44/40Ca) are particularly useful in palaeo‐environmental studies due to the key role of carbonate minerals in continental weathering and their formation in seawater. The calcium isotope ratio can provide hints on past changes in the calcium fluxes, environmental shifts, e...
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ftdoajarticles:oai:doaj.org/article:5e50ba76f3bb43479d5262d1dd45385b 2023-12-03T10:28:22+01:00 The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic Zsófia Kovács Isaline Demangel Andre Baldermann Dorothee Hippler Anne‐Désirée Schmitt Sophie Gangloff Leopold Krystyn Sylvain Richoz 2022-12-01T00:00:00Z https://doi.org/10.1029/2022GC010405 https://doaj.org/article/5e50ba76f3bb43479d5262d1dd45385b EN eng Wiley https://doi.org/10.1029/2022GC010405 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2022GC010405 https://doaj.org/article/5e50ba76f3bb43479d5262d1dd45385b Geochemistry, Geophysics, Geosystems, Vol 23, Iss 12, Pp n/a-n/a (2022) isotope proxy Rhaetian nannofossils carbonates end‐Triassic mas extinction Triassic/Jurassic boundary Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.1029/2022GC010405 2023-11-05T01:35:57Z Abstract Calcium isotopes (δ44/40Ca) are particularly useful in palaeo‐environmental studies due to the key role of carbonate minerals in continental weathering and their formation in seawater. The calcium isotope ratio can provide hints on past changes in the calcium fluxes, environmental shifts, ecological factors and alternatively diagenesis of carbonate rocks. The investigation of the Late Triassic calcium isotope record offers a great opportunity to evaluate such factors in a time interval that witnessed important environmental and ecological turnovers, such as the first appearance of calcareous nannoplankton, ocean acidification and periods of elevated extinction rates. In this study, we present a δ44/40Ca data set from the upper Norian (Upper Triassic) through the lower Hettangian (Lower Jurassic) interval. The isotope records reveal two globally significant signals: a ∼ 0.20‰ decrease through the early Rhaetian (Upper Triassic) and a small, negative (∼0.14‰) excursion corresponding to the emplacement of the Central Atlantic Magmatic Province, at the end of the Triassic. The possible explanations for these signals are changes in the isotopic ratio of the continental calcium influx to the ocean due to the high chemical weathering rate of carbonates and possibly ocean acidification, respectively. The considerable (∼0.15–0.30‰) offset in δ44/40Ca between study areas is likely the combined result of local differences in lithology and early marine diagenesis. The major evolutionary step represented by the first occurrence of calcareous nannoplankton did not have at this time a determining role on the calcium isotopic signature of the marine carbonates. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Geochemistry, Geophysics, Geosystems 23 12 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
isotope proxy Rhaetian nannofossils carbonates end‐Triassic mas extinction Triassic/Jurassic boundary Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
isotope proxy Rhaetian nannofossils carbonates end‐Triassic mas extinction Triassic/Jurassic boundary Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Zsófia Kovács Isaline Demangel Andre Baldermann Dorothee Hippler Anne‐Désirée Schmitt Sophie Gangloff Leopold Krystyn Sylvain Richoz The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic |
topic_facet |
isotope proxy Rhaetian nannofossils carbonates end‐Triassic mas extinction Triassic/Jurassic boundary Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract Calcium isotopes (δ44/40Ca) are particularly useful in palaeo‐environmental studies due to the key role of carbonate minerals in continental weathering and their formation in seawater. The calcium isotope ratio can provide hints on past changes in the calcium fluxes, environmental shifts, ecological factors and alternatively diagenesis of carbonate rocks. The investigation of the Late Triassic calcium isotope record offers a great opportunity to evaluate such factors in a time interval that witnessed important environmental and ecological turnovers, such as the first appearance of calcareous nannoplankton, ocean acidification and periods of elevated extinction rates. In this study, we present a δ44/40Ca data set from the upper Norian (Upper Triassic) through the lower Hettangian (Lower Jurassic) interval. The isotope records reveal two globally significant signals: a ∼ 0.20‰ decrease through the early Rhaetian (Upper Triassic) and a small, negative (∼0.14‰) excursion corresponding to the emplacement of the Central Atlantic Magmatic Province, at the end of the Triassic. The possible explanations for these signals are changes in the isotopic ratio of the continental calcium influx to the ocean due to the high chemical weathering rate of carbonates and possibly ocean acidification, respectively. The considerable (∼0.15–0.30‰) offset in δ44/40Ca between study areas is likely the combined result of local differences in lithology and early marine diagenesis. The major evolutionary step represented by the first occurrence of calcareous nannoplankton did not have at this time a determining role on the calcium isotopic signature of the marine carbonates. |
format |
Article in Journal/Newspaper |
author |
Zsófia Kovács Isaline Demangel Andre Baldermann Dorothee Hippler Anne‐Désirée Schmitt Sophie Gangloff Leopold Krystyn Sylvain Richoz |
author_facet |
Zsófia Kovács Isaline Demangel Andre Baldermann Dorothee Hippler Anne‐Désirée Schmitt Sophie Gangloff Leopold Krystyn Sylvain Richoz |
author_sort |
Zsófia Kovács |
title |
The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic |
title_short |
The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic |
title_full |
The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic |
title_fullStr |
The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic |
title_full_unstemmed |
The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes: Insights From the Late Triassic |
title_sort |
calcium isotope (δ44/40ca) record through environmental changes: insights from the late triassic |
publisher |
Wiley |
publishDate |
2022 |
url |
https://doi.org/10.1029/2022GC010405 https://doaj.org/article/5e50ba76f3bb43479d5262d1dd45385b |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 23, Iss 12, Pp n/a-n/a (2022) |
op_relation |
https://doi.org/10.1029/2022GC010405 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2022GC010405 https://doaj.org/article/5e50ba76f3bb43479d5262d1dd45385b |
op_doi |
https://doi.org/10.1029/2022GC010405 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
23 |
container_issue |
12 |
_version_ |
1784252975410053120 |