Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C

The oxygen isotope composition of siderites can be used to deduce the paleoenvironmental conditions under which the mineral formed. However, it is not clear whether the published fractionation factors (αCO2-siderite) for the acid digestion of siderites are appropriate for modern “on-line” sample pre...

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Autores: Fernández, Álvaro, van Dijk, Joep, Müller, Inigo A., Bernasconi, Stefano M.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/376754
Acceso en línea:http://hdl.handle.net/10261/376754
Access Level:acceso abierto
Palabra clave:Isotopes
Acid digestion
Clumped isotopes
Fractionation factors
Geochemistry
Fractionation
Siderite
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spelling Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °CFernández, Álvarovan Dijk, JoepMüller, Inigo A.Bernasconi, Stefano M.IsotopesAcid digestionClumped isotopesFractionation factorsGeochemistryFractionationSideriteThe oxygen isotope composition of siderites can be used to deduce the paleoenvironmental conditions under which the mineral formed. However, it is not clear whether the published fractionation factors (αCO2-siderite) for the acid digestion of siderites are appropriate for modern “on-line” sample preparation techniques. This is an important source of uncertainty that has not yet been investigated. To this aim, we obtained new siderite acid fractionation factors for open and closed vessel digestions at 100 °C and 70 °C, respectively. We find that previous αCO2-siderite estimates are appropriate for GasBench-type sealed vessel digestions and propose a revised relationship between αCO2-siderite and temperature:1000⋅lnαCO2‐Siderite=4.06±0.17103/T−1.93±0.5R2=0.99 This relationship encompasses most practical laboratory digestion temperatures and has a temperature sensitivity of − 0.032‰/°C that is similar to other carbonate minerals. The open vessel digestion αCO2-siderite at 100 °C, on the other hand, is offset from previous estimates by 1‰, with a value of 1000·lnα = 9.79 ± 0.23 (0.12 SE). This estimate is essential for the open vessel digestions that are needed for siderite clumped isotope analyses.This study was funded by the Swiss National Science Foundation projects No. 160046 and 156408 and ETH Project no. ETH-3314-1.Peer reviewedElsevier BVSwiss National Science FoundationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/376754reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.chemgeo.2016.10.015Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3767542026-05-22T06:33:51Z
dc.title.none.fl_str_mv Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
title Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
spellingShingle Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
Fernández, Álvaro
Isotopes
Acid digestion
Clumped isotopes
Fractionation factors
Geochemistry
Fractionation
Siderite
title_short Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
title_full Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
title_fullStr Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
title_full_unstemmed Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
title_sort Siderite acid fractionation factors for sealed and open vessel digestions at 70 °C and 100 °C
dc.creator.none.fl_str_mv Fernández, Álvaro
van Dijk, Joep
Müller, Inigo A.
Bernasconi, Stefano M.
author Fernández, Álvaro
author_facet Fernández, Álvaro
van Dijk, Joep
Müller, Inigo A.
Bernasconi, Stefano M.
author_role author
author2 van Dijk, Joep
Müller, Inigo A.
Bernasconi, Stefano M.
author2_role author
author
author
dc.contributor.none.fl_str_mv Swiss National Science Foundation
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Isotopes
Acid digestion
Clumped isotopes
Fractionation factors
Geochemistry
Fractionation
Siderite
topic Isotopes
Acid digestion
Clumped isotopes
Fractionation factors
Geochemistry
Fractionation
Siderite
description The oxygen isotope composition of siderites can be used to deduce the paleoenvironmental conditions under which the mineral formed. However, it is not clear whether the published fractionation factors (αCO2-siderite) for the acid digestion of siderites are appropriate for modern “on-line” sample preparation techniques. This is an important source of uncertainty that has not yet been investigated. To this aim, we obtained new siderite acid fractionation factors for open and closed vessel digestions at 100 °C and 70 °C, respectively. We find that previous αCO2-siderite estimates are appropriate for GasBench-type sealed vessel digestions and propose a revised relationship between αCO2-siderite and temperature:1000⋅lnαCO2‐Siderite=4.06±0.17103/T−1.93±0.5R2=0.99 This relationship encompasses most practical laboratory digestion temperatures and has a temperature sensitivity of − 0.032‰/°C that is similar to other carbonate minerals. The open vessel digestion αCO2-siderite at 100 °C, on the other hand, is offset from previous estimates by 1‰, with a value of 1000·lnα = 9.79 ± 0.23 (0.12 SE). This estimate is essential for the open vessel digestions that are needed for siderite clumped isotope analyses.
publishDate 2016
dc.date.none.fl_str_mv 2016
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/376754
url http://hdl.handle.net/10261/376754
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.chemgeo.2016.10.015
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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