The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes : Insights From the Late Triassic
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...
Published in: | Geochemistry, Geophysics, Geosystems |
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Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union (AGU)
2022
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Online Access: | https://lup.lub.lu.se/record/179769f7-6da5-4795-b403-10c422258072 https://doi.org/10.1029/2022GC010405 |
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ftulundlup:oai:lup.lub.lu.se:179769f7-6da5-4795-b403-10c422258072 2024-04-21T08:09:39+00:00 The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes : Insights From the Late Triassic Kovács, Zsófia Demangel, Isaline Baldermann, Andre Hippler, Dorothee Schmitt, Anne Désirée Gangloff, Sophie Krystyn, Leopold Richoz, Sylvain 2022-12 https://lup.lub.lu.se/record/179769f7-6da5-4795-b403-10c422258072 https://doi.org/10.1029/2022GC010405 eng eng American Geophysical Union (AGU) https://lup.lub.lu.se/record/179769f7-6da5-4795-b403-10c422258072 http://dx.doi.org/10.1029/2022GC010405 scopus:85145020719 Geochemistry, Geophysics, Geosystems; 23(12), no e2022GC010405 (2022) ISSN: 1525-2027 Geology carbonates end-Triassic mas extinction isotope proxy nannofossils Rhaetian Triassic/Jurassic boundary contributiontojournal/article info:eu-repo/semantics/article text 2022 ftulundlup https://doi.org/10.1029/2022GC010405 2024-03-27T15:30:36Z 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 Lund University Publications (LUP) Geochemistry, Geophysics, Geosystems 23 12 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology carbonates end-Triassic mas extinction isotope proxy nannofossils Rhaetian Triassic/Jurassic boundary |
spellingShingle |
Geology carbonates end-Triassic mas extinction isotope proxy nannofossils Rhaetian Triassic/Jurassic boundary Kovács, Zsófia Demangel, Isaline Baldermann, Andre Hippler, Dorothee Schmitt, Anne Désirée Gangloff, Sophie Krystyn, Leopold Richoz, Sylvain The Calcium Isotope (δ44/40Ca) Record Through Environmental Changes : Insights From the Late Triassic |
topic_facet |
Geology carbonates end-Triassic mas extinction isotope proxy nannofossils Rhaetian Triassic/Jurassic boundary |
description |
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 |
Kovács, Zsófia Demangel, Isaline Baldermann, Andre Hippler, Dorothee Schmitt, Anne Désirée Gangloff, Sophie Krystyn, Leopold Richoz, Sylvain |
author_facet |
Kovács, Zsófia Demangel, Isaline Baldermann, Andre Hippler, Dorothee Schmitt, Anne Désirée Gangloff, Sophie Krystyn, Leopold Richoz, Sylvain |
author_sort |
Kovács, Zsófia |
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 |
American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://lup.lub.lu.se/record/179769f7-6da5-4795-b403-10c422258072 https://doi.org/10.1029/2022GC010405 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Geochemistry, Geophysics, Geosystems; 23(12), no e2022GC010405 (2022) ISSN: 1525-2027 |
op_relation |
https://lup.lub.lu.se/record/179769f7-6da5-4795-b403-10c422258072 http://dx.doi.org/10.1029/2022GC010405 scopus:85145020719 |
op_doi |
https://doi.org/10.1029/2022GC010405 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
23 |
container_issue |
12 |
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1796950823445463040 |