File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Intra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry

TitleIntra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry
Authors
Issue Date2021
PublisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1525-2027/
Citation
Geochemistry, Geophysics, Geosystems, 2021, v. 22 n. 2, p. article no. e2020GC009379 How to Cite?
AbstractReconstructing intermediate and bottom-water temperature in the Arctic Ocean is key for understanding paleoclimatic phenomena, such as the region's interactions with warm Atlantic waters, stratification, and sea-ice dynamics. However, benthic proxy archives are sparse throughout the Arctic circle compared to lower latitudes. Trace-element ratios (E/Ca) derived from ostracodes, a group of bivalved microscopic crustaceans, have shown promise in this regard. Samples for E/Ca measurements typically require rigorous cleaning prior to analysis, and signs of contamination are routinely monitored through the presence of other trace elements such as Al, Fe, and Mn, which are associated with suspected sources of overprinting. However, there has not yet been an intra-valve investigation of all of these trace elements, which may hinder our ability to effectively identify geochemical overprinting. Here, we present several elemental concentration and E/Ca ratio measurements in two ostracode genera, Krithe and Polycope, extracted from Chukchi Sea sediment samples. We further investigate the intra-valve distribution of elements within single shells of adult and juvenile specimens using electron probe microanalysis (EPMA). Our findings suggest that brushing and bleach treatments may not be effective for completely eliminating clays from the edges of valves, which can bias paleoclimatologically relevant trace-element proxies such as Mg/Ca ratios, particularly in the case of incomplete or small samples with low amounts of calcite material. In addition, we report the first trace-element data from the genus Polycope, which shows potential as a new Arctic paleotemperature archive.
Persistent Identifierhttp://hdl.handle.net/10722/303939
ISSN
2023 Impact Factor: 2.9
2023 SCImago Journal Rankings: 1.457
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorRODRIGUEZ MORENO, M-
dc.contributor.authorDOHERTY, JM-
dc.contributor.authorMAN, HLH-
dc.contributor.authorWang, R-
dc.contributor.authorXiao, W-
dc.contributor.authorZhou, B-
dc.contributor.authorThibodeau, B-
dc.contributor.authorNot, C-
dc.date.accessioned2021-09-23T08:52:55Z-
dc.date.available2021-09-23T08:52:55Z-
dc.date.issued2021-
dc.identifier.citationGeochemistry, Geophysics, Geosystems, 2021, v. 22 n. 2, p. article no. e2020GC009379-
dc.identifier.issn1525-2027-
dc.identifier.urihttp://hdl.handle.net/10722/303939-
dc.description.abstractReconstructing intermediate and bottom-water temperature in the Arctic Ocean is key for understanding paleoclimatic phenomena, such as the region's interactions with warm Atlantic waters, stratification, and sea-ice dynamics. However, benthic proxy archives are sparse throughout the Arctic circle compared to lower latitudes. Trace-element ratios (E/Ca) derived from ostracodes, a group of bivalved microscopic crustaceans, have shown promise in this regard. Samples for E/Ca measurements typically require rigorous cleaning prior to analysis, and signs of contamination are routinely monitored through the presence of other trace elements such as Al, Fe, and Mn, which are associated with suspected sources of overprinting. However, there has not yet been an intra-valve investigation of all of these trace elements, which may hinder our ability to effectively identify geochemical overprinting. Here, we present several elemental concentration and E/Ca ratio measurements in two ostracode genera, Krithe and Polycope, extracted from Chukchi Sea sediment samples. We further investigate the intra-valve distribution of elements within single shells of adult and juvenile specimens using electron probe microanalysis (EPMA). Our findings suggest that brushing and bleach treatments may not be effective for completely eliminating clays from the edges of valves, which can bias paleoclimatologically relevant trace-element proxies such as Mg/Ca ratios, particularly in the case of incomplete or small samples with low amounts of calcite material. In addition, we report the first trace-element data from the genus Polycope, which shows potential as a new Arctic paleotemperature archive.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1525-2027/-
dc.relation.ispartofGeochemistry, Geophysics, Geosystems-
dc.rightsGeochemistry, Geophysics, Geosystems. Copyright © American Geophysical Union.-
dc.rights©[2021]. American Geophysical Union. All Rights Reserved. This article is available at https://doi.org/10.1029/2020GC009379-
dc.titleIntra‐Valve Elemental Distributions in Arctic Marine Ostracodes: Implications for Mg/Ca and Sr/Ca Paleothermometry-
dc.typeArticle-
dc.identifier.emailNot, C: cnot@hku.hk-
dc.identifier.authorityThibodeau, B=rp02033-
dc.identifier.authorityNot, C=rp02029-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2020GC009379-
dc.identifier.scopuseid_2-s2.0-85101551494-
dc.identifier.hkuros325695-
dc.identifier.volume22-
dc.identifier.issue2-
dc.identifier.spagearticle no. e2020GC009379-
dc.identifier.epagearticle no. e2020GC009379-
dc.identifier.isiWOS:000631923900001-
dc.publisher.placeUnited States-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats