In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology
Bivalve shells are extensively used as bioarchives for paleoclimate and paleoenvironmental reconstructions. Proxy calibrations in recent shells are the basis for sclerochronology and the applications of geochemistry data to fossils. Shell geochemical information, however, could be altered with the d...
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ftmdpi:oai:mdpi.com:/2075-163X/10/6/529/ 2023-08-20T04:02:34+02:00 In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology Alberto Pérez-Huerta Sally E. Walker Chiara Cappelli agris 2020-06-10 application/pdf https://doi.org/10.3390/min10060529 EN eng Multidisciplinary Digital Publishing Institute Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min10060529 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 10; Issue 6; Pages: 529 atom probe tomography (APT) biomineralization proteoglycans carboxylic acid Adamussium colbecki Antarctica proxies Mg/Ca δ 15 N Text 2020 ftmdpi https://doi.org/10.3390/min10060529 2023-07-31T23:37:10Z Bivalve shells are extensively used as bioarchives for paleoclimate and paleoenvironmental reconstructions. Proxy calibrations in recent shells are the basis for sclerochronology and the applications of geochemistry data to fossils. Shell geochemical information, however, could be altered with the disappearance of intercrystalline organic matrix components, including those linked to shell growth increments, during early diagenesis. Thus, an evaluation of the chemistry of such organics is needed for the correct use of sclerochronological records in fossil shells. Here, we use atom probe tomography (APT) for in situ geochemical characterization of the insoluble organic matrix in shell growth increments in the Antarctic scallop, Adamussium colbecki. We confirm the presence of carboxylated S-rich proteoglycans, possibly involved in calcite nucleation and growth in these scallops, with significant concentrations of magnesium and calcium. Diagenetic modification of these organic components could impact proxy data based on Mg/Ca ratios, but more importantly the use of the δ15N proxy, since most of the shell nitrogen is likely bound to the amide groups of proteins. Overall, our findings reinforce the idea that shell organics need to be accounted for in the understanding of geochemical proxies. Text Antarc* Antarctic Antarctica MDPI Open Access Publishing Antarctic The Antarctic Minerals 10 6 529 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
atom probe tomography (APT) biomineralization proteoglycans carboxylic acid Adamussium colbecki Antarctica proxies Mg/Ca δ 15 N |
spellingShingle |
atom probe tomography (APT) biomineralization proteoglycans carboxylic acid Adamussium colbecki Antarctica proxies Mg/Ca δ 15 N Alberto Pérez-Huerta Sally E. Walker Chiara Cappelli In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology |
topic_facet |
atom probe tomography (APT) biomineralization proteoglycans carboxylic acid Adamussium colbecki Antarctica proxies Mg/Ca δ 15 N |
description |
Bivalve shells are extensively used as bioarchives for paleoclimate and paleoenvironmental reconstructions. Proxy calibrations in recent shells are the basis for sclerochronology and the applications of geochemistry data to fossils. Shell geochemical information, however, could be altered with the disappearance of intercrystalline organic matrix components, including those linked to shell growth increments, during early diagenesis. Thus, an evaluation of the chemistry of such organics is needed for the correct use of sclerochronological records in fossil shells. Here, we use atom probe tomography (APT) for in situ geochemical characterization of the insoluble organic matrix in shell growth increments in the Antarctic scallop, Adamussium colbecki. We confirm the presence of carboxylated S-rich proteoglycans, possibly involved in calcite nucleation and growth in these scallops, with significant concentrations of magnesium and calcium. Diagenetic modification of these organic components could impact proxy data based on Mg/Ca ratios, but more importantly the use of the δ15N proxy, since most of the shell nitrogen is likely bound to the amide groups of proteins. Overall, our findings reinforce the idea that shell organics need to be accounted for in the understanding of geochemical proxies. |
format |
Text |
author |
Alberto Pérez-Huerta Sally E. Walker Chiara Cappelli |
author_facet |
Alberto Pérez-Huerta Sally E. Walker Chiara Cappelli |
author_sort |
Alberto Pérez-Huerta |
title |
In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology |
title_short |
In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology |
title_full |
In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology |
title_fullStr |
In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology |
title_full_unstemmed |
In Situ Geochemical Analysis of Organics in Growth Lines of Antarctic Scallop Shells: Implications for Sclerochronology |
title_sort |
in situ geochemical analysis of organics in growth lines of antarctic scallop shells: implications for sclerochronology |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/min10060529 |
op_coverage |
agris |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Minerals; Volume 10; Issue 6; Pages: 529 |
op_relation |
Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min10060529 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min10060529 |
container_title |
Minerals |
container_volume |
10 |
container_issue |
6 |
container_start_page |
529 |
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1774713086898339840 |