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Stable isotopes (δ13C, δ18O) and element ratios (Mg/Ca, Sr/Ca) of Jurassic belemnites, bivalves and brachiopods from the Neuquén Basin (Argentina): challenges and opportunities for palaeoenvironmental reconstructions

View ORCID ProfileMatthias Alberti, Horacio Parent, Alberto C. Garrido, View ORCID ProfileNils Andersen, View ORCID ProfileDieter Garbe-Schönberg and View ORCID ProfileSilvia Danise
Journal of the Geological Society, 178, jgs2020-163, 10 November 2020, https://doi.org/10.1144/jgs2020-163
Matthias Alberti
1Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Straße 10, , Germany
Roles: [Conceptualization (Lead)], [Funding acquisition (Lead)], [Investigation (Lead)], [Methodology (Lead)], [Writing – original draft (Lead)], [Writing – review & editing (Lead)]
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  • ORCID record for Matthias Alberti
  • For correspondence: matthias.alberti@ifg.uni-kiel.de
Horacio Parent
2Laboratorio de Paleontología, IFG-FCEIA, Universidad Nacional de Rosario, Pellegrini 250, , Argentina
Roles: [Conceptualization (Supporting)], [Funding acquisition (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
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Alberto C. Garrido
3Museo Provincial de Ciencias Naturales ‘Prof. Dr. Juan Olsacher’, Dirección Provincial de Minería, Elena de Vega 472, , Argentina
4Centro de Investigación en Geociencias de la Patagonia – CIGPat, Departamento de Geología y Petróleo, Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, , Argentina
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Resources (Supporting)], [Writing – original draft (Supporting)]
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Nils Andersen
5Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 11, , Germany
Roles: [Conceptualization (Supporting)], [Funding acquisition (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
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Dieter Garbe-Schönberg
1Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Straße 10, , Germany
Roles: [Conceptualization (Supporting)], [Funding acquisition (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
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  • ORCID record for Dieter Garbe-Schönberg
Silvia Danise
6Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, , , Italy
Roles: [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
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Abstract

Fossils from the Jurassic succession of the Neuquén Basin (Argentina) were analysed for their stable isotope (δ13C, δ18O) and elemental (Mg/Ca, Sr/Ca) composition. Mg/Ca ratios point to comparatively stable temperature conditions from the Bajocian to Early Oxfordian and during the Tithonian, but do not allow a reliable reconstruction of absolute water temperatures. Sr/Ca ratios follow the general global pattern, indicating water exchange between the basin and the open ocean. The δ18O values can be translated into water temperatures between 20 and 25°C for most of the studied intervals with possible shorter cold spells in the Late Pliensbachian, Bajocian and Late Tithonian. However, precise temperature reconstructions are complicated by bivalve shells from the northern–central part of the basin pointing to local fluctuations in the δ18O values of seawater. Potential reasons for these variations are discussed, but it seems most likely that they are caused by phases of enhanced freshwater input leading to meso- to brachyhaline conditions in the northern study areas. This paper therefore exemplifies the particular challenges for temperature reconstructions in marginal seas and highlights the opportunities of combining different geochemical proxies to disentangle the influence of different environmental parameters.

Supplementary material: Detailed results of the geochemical analyses, geographical coordinates and information on biostratigraphy are available at https://doi.org/10.6084/m9.figshare.c.5173466

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 178 (1)
Journal of the Geological Society
Volume 178, Issue 1
January 2021
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Stable isotopes (δ13C, δ18O) and element ratios (Mg/Ca, Sr/Ca) of Jurassic belemnites, bivalves and brachiopods from the Neuquén Basin (Argentina): challenges and opportunities for palaeoenvironmental reconstructions

Matthias Alberti, Horacio Parent, Alberto C. Garrido, Nils Andersen, Dieter Garbe-Schönberg and Silvia Danise
Journal of the Geological Society, 178, jgs2020-163, 10 November 2020, https://doi.org/10.1144/jgs2020-163
Matthias Alberti
1Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Straße 10, , Germany
Roles: [Conceptualization (Lead)], [Funding acquisition (Lead)], [Investigation (Lead)], [Methodology (Lead)], [Writing – original draft (Lead)], [Writing – review & editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Matthias Alberti
  • For correspondence: matthias.alberti@ifg.uni-kiel.de
Horacio Parent
2Laboratorio de Paleontología, IFG-FCEIA, Universidad Nacional de Rosario, Pellegrini 250, , Argentina
Roles: [Conceptualization (Supporting)], [Funding acquisition (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Alberto C. Garrido
3Museo Provincial de Ciencias Naturales ‘Prof. Dr. Juan Olsacher’, Dirección Provincial de Minería, Elena de Vega 472, , Argentina
4Centro de Investigación en Geociencias de la Patagonia – CIGPat, Departamento de Geología y Petróleo, Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, , Argentina
Roles: [Conceptualization (Supporting)], [Investigation (Supporting)], [Resources (Supporting)], [Writing – original draft (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Nils Andersen
5Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 11, , Germany
Roles: [Conceptualization (Supporting)], [Funding acquisition (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Nils Andersen
Dieter Garbe-Schönberg
1Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Straße 10, , Germany
Roles: [Conceptualization (Supporting)], [Funding acquisition (Supporting)], [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Dieter Garbe-Schönberg
Silvia Danise
6Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via La Pira 4, , , Italy
Roles: [Investigation (Supporting)], [Methodology (Supporting)], [Writing – original draft (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Silvia Danise

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Stable isotopes (δ13C, δ18O) and element ratios (Mg/Ca, Sr/Ca) of Jurassic belemnites, bivalves and brachiopods from the Neuquén Basin (Argentina): challenges and opportunities for palaeoenvironmental reconstructions

Matthias Alberti, Horacio Parent, Alberto C. Garrido, Nils Andersen, Dieter Garbe-Schönberg and Silvia Danise
Journal of the Geological Society, 178, jgs2020-163, 10 November 2020, https://doi.org/10.1144/jgs2020-163
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