Coral Li/Mg thermometry: Caveats and constraints
The coral Li/Mg temperature proxy is revisited through an in-depth trace element analysis of scleractinians collected live from tropical to polar environments. The dataset consists of Li/Ca, Mg/Ca, Sr/Ca and Li/Mg ratios from 64 coral specimens belonging to 8 different taxa, including both reef-buil...
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Online Access: | http://hdl.handle.net/11577/3299735 https://doi.org/10.1016/j.chemgeo.2019.03.038 |
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ftunivpadovairis:oai:www.research.unipd.it:11577/3299735 2024-04-21T07:47:49+00:00 Coral Li/Mg thermometry: Caveats and constraints Cuny-Guirriec, Kristan Douville, Eric Reynaud, Stéphanie Allemand, Denis Bordier, Louise Canesi, Marine Mazzoli, Claudio Taviani, Marco Canese, Simonepietro McCulloch, Malcolm Trotter, Julie Rico-Esenaro, Serguei Damián Sanchez-Cabeza, Joan-Albert Ruiz-Fernández, Ana Carolina Carricart-Ganivet, Juan P. Scott, Pete Sadekov, Aleksey Montagna, Paolo Cuny-Guirriec, Kristan Douville, Eric Reynaud, Stéphanie Allemand, Deni Bordier, Louise Canesi, Marine Mazzoli, Claudio Taviani, Marco Canese, Simonepietro Mcculloch, Malcolm Trotter, Julie Rico-Esenaro, Serguei Damián Sanchez-Cabeza, Joan-Albert Ruiz-Fernández, Ana Carolina Carricart-Ganivet, Juan P. Scott, Pete Sadekov, Aleksey Montagna, Paolo 2019 STAMPA http://hdl.handle.net/11577/3299735 https://doi.org/10.1016/j.chemgeo.2019.03.038 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000480333200014 volume:523 firstpage:162 lastpage:178 numberofpages:17 journal:CHEMICAL GEOLOGY http://hdl.handle.net/11577/3299735 doi:10.1016/j.chemgeo.2019.03.038 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85068506810 scleractinian corals Li/Mg paleo-temperature proxy organic matter calcite contamination info:eu-repo/semantics/article 2019 ftunivpadovairis https://doi.org/10.1016/j.chemgeo.2019.03.038 2024-03-28T02:07:04Z The coral Li/Mg temperature proxy is revisited through an in-depth trace element analysis of scleractinians collected live from tropical to polar environments. The dataset consists of Li/Ca, Mg/Ca, Sr/Ca and Li/Mg ratios from 64 coral specimens belonging to 8 different taxa, including both reef-building zooxanthellate and cold-water non-zooxanthellate species, from a wide range water temperature (-1 to 29.5°C), salinity (34.71 to 38.61), and depth (3 to 670 m). Our results showed that the reliability of the Li/Mg temperature proxy is strongly limited by the organic matter associated with the coral skeleton, which is most evident within the green bands observed in tropical corals. Organic-rich bands can double the Mg content otherwise present in the skeleton, which may ultimately lead to a temperature overestimation exceeding 15°C. We found that this bias can be overcome by the treatment of coral skeletons with a specific oxidizing cleaning protocol. We also detected the presence of calcite deposits within the aragonite skeleton of some Antarctic living coral specimens, which strongly affects the robustness of the Li/Mg proxy given its temperature sensitivity of ~1.5°C/1% calcite. Therefore, to obtain reliable reconstructions a correction needs to be applied when organic matter and/or calcite contamination is present, which requires the scrupulous assessment of the integrity of the aragonite prior to geochemical analyses. Given that some species entrap more organic matter than others, and that some are more prone to calcite contamination, a taxon-related effect is apparent. Here we show that the tropical species Porites spp., Pseudodiploria strigosa and Orbicella annularis, and the cold-water species Madrepora oculata, Caryophyllia antarctica and Flabellum impensum, are all suitable candidates for reconstructing seawater temperatures. The integrated results across a wide temperature range, from extreme cold to tropical shallow waters, yield an overall precision for the Li/Mg-temperature proxy of ± 1.0°C, as ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Padua Research Archive (IRIS - Università degli Studi di Padova) Chemical Geology 523 162 178 |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
topic |
scleractinian corals Li/Mg paleo-temperature proxy organic matter calcite contamination |
spellingShingle |
scleractinian corals Li/Mg paleo-temperature proxy organic matter calcite contamination Cuny-Guirriec, Kristan Douville, Eric Reynaud, Stéphanie Allemand, Denis Bordier, Louise Canesi, Marine Mazzoli, Claudio Taviani, Marco Canese, Simonepietro McCulloch, Malcolm Trotter, Julie Rico-Esenaro, Serguei Damián Sanchez-Cabeza, Joan-Albert Ruiz-Fernández, Ana Carolina Carricart-Ganivet, Juan P. Scott, Pete Sadekov, Aleksey Montagna, Paolo Coral Li/Mg thermometry: Caveats and constraints |
topic_facet |
scleractinian corals Li/Mg paleo-temperature proxy organic matter calcite contamination |
description |
The coral Li/Mg temperature proxy is revisited through an in-depth trace element analysis of scleractinians collected live from tropical to polar environments. The dataset consists of Li/Ca, Mg/Ca, Sr/Ca and Li/Mg ratios from 64 coral specimens belonging to 8 different taxa, including both reef-building zooxanthellate and cold-water non-zooxanthellate species, from a wide range water temperature (-1 to 29.5°C), salinity (34.71 to 38.61), and depth (3 to 670 m). Our results showed that the reliability of the Li/Mg temperature proxy is strongly limited by the organic matter associated with the coral skeleton, which is most evident within the green bands observed in tropical corals. Organic-rich bands can double the Mg content otherwise present in the skeleton, which may ultimately lead to a temperature overestimation exceeding 15°C. We found that this bias can be overcome by the treatment of coral skeletons with a specific oxidizing cleaning protocol. We also detected the presence of calcite deposits within the aragonite skeleton of some Antarctic living coral specimens, which strongly affects the robustness of the Li/Mg proxy given its temperature sensitivity of ~1.5°C/1% calcite. Therefore, to obtain reliable reconstructions a correction needs to be applied when organic matter and/or calcite contamination is present, which requires the scrupulous assessment of the integrity of the aragonite prior to geochemical analyses. Given that some species entrap more organic matter than others, and that some are more prone to calcite contamination, a taxon-related effect is apparent. Here we show that the tropical species Porites spp., Pseudodiploria strigosa and Orbicella annularis, and the cold-water species Madrepora oculata, Caryophyllia antarctica and Flabellum impensum, are all suitable candidates for reconstructing seawater temperatures. The integrated results across a wide temperature range, from extreme cold to tropical shallow waters, yield an overall precision for the Li/Mg-temperature proxy of ± 1.0°C, as ... |
author2 |
Cuny-Guirriec, Kristan Douville, Eric Reynaud, Stéphanie Allemand, Deni Bordier, Louise Canesi, Marine Mazzoli, Claudio Taviani, Marco Canese, Simonepietro Mcculloch, Malcolm Trotter, Julie Rico-Esenaro, Serguei Damián Sanchez-Cabeza, Joan-Albert Ruiz-Fernández, Ana Carolina Carricart-Ganivet, Juan P. Scott, Pete Sadekov, Aleksey Montagna, Paolo |
format |
Article in Journal/Newspaper |
author |
Cuny-Guirriec, Kristan Douville, Eric Reynaud, Stéphanie Allemand, Denis Bordier, Louise Canesi, Marine Mazzoli, Claudio Taviani, Marco Canese, Simonepietro McCulloch, Malcolm Trotter, Julie Rico-Esenaro, Serguei Damián Sanchez-Cabeza, Joan-Albert Ruiz-Fernández, Ana Carolina Carricart-Ganivet, Juan P. Scott, Pete Sadekov, Aleksey Montagna, Paolo |
author_facet |
Cuny-Guirriec, Kristan Douville, Eric Reynaud, Stéphanie Allemand, Denis Bordier, Louise Canesi, Marine Mazzoli, Claudio Taviani, Marco Canese, Simonepietro McCulloch, Malcolm Trotter, Julie Rico-Esenaro, Serguei Damián Sanchez-Cabeza, Joan-Albert Ruiz-Fernández, Ana Carolina Carricart-Ganivet, Juan P. Scott, Pete Sadekov, Aleksey Montagna, Paolo |
author_sort |
Cuny-Guirriec, Kristan |
title |
Coral Li/Mg thermometry: Caveats and constraints |
title_short |
Coral Li/Mg thermometry: Caveats and constraints |
title_full |
Coral Li/Mg thermometry: Caveats and constraints |
title_fullStr |
Coral Li/Mg thermometry: Caveats and constraints |
title_full_unstemmed |
Coral Li/Mg thermometry: Caveats and constraints |
title_sort |
coral li/mg thermometry: caveats and constraints |
publishDate |
2019 |
url |
http://hdl.handle.net/11577/3299735 https://doi.org/10.1016/j.chemgeo.2019.03.038 |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000480333200014 volume:523 firstpage:162 lastpage:178 numberofpages:17 journal:CHEMICAL GEOLOGY http://hdl.handle.net/11577/3299735 doi:10.1016/j.chemgeo.2019.03.038 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85068506810 |
op_doi |
https://doi.org/10.1016/j.chemgeo.2019.03.038 |
container_title |
Chemical Geology |
container_volume |
523 |
container_start_page |
162 |
op_container_end_page |
178 |
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1796947248730341376 |