The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir
International audience In this paper, we re-investigate the isotopic composition of hydrogen in MORB and the possible effects of contamination on δD and water content. A suite of 40 N-MORB from the Pacific-Antarctic ridge, far from any hotspot, was analyzed for chlorine content by electron microprob...
Published in: | Earth and Planetary Science Letters |
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ftunivnantes:oai:HAL:insu-00933598v1 2023-05-15T13:47:23+02:00 The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir Clog, Matthieu Aubaud, Cyril Cartigny, Pierre Dosso, Laure Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Computer Science Department (CS CALTECH) California Institute of Technology (CALTECH) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal-insu.archives-ouvertes.fr/insu-00933598 https://hal-insu.archives-ouvertes.fr/insu-00933598/document https://hal-insu.archives-ouvertes.fr/insu-00933598/file/27274.pdf https://doi.org/10.1016/J.EPSL.2013.08.043 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/J.EPSL.2013.08.043 insu-00933598 https://hal-insu.archives-ouvertes.fr/insu-00933598 https://hal-insu.archives-ouvertes.fr/insu-00933598/document https://hal-insu.archives-ouvertes.fr/insu-00933598/file/27274.pdf BIBCODE: 2013E&PSL.381.156C doi:10.1016/J.EPSL.2013.08.043 info:eu-repo/semantics/OpenAccess ISSN: 0012-821X Earth and Planetary Science Letters https://hal-insu.archives-ouvertes.fr/insu-00933598 Earth and Planetary Science Letters, 2013, 381, pp.156-165. ⟨10.1016/J.EPSL.2013.08.043⟩ hydrogen isotopes mantle geochemistry mantle water [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2013 ftunivnantes https://doi.org/10.1016/J.EPSL.2013.08.043 2023-02-08T05:31:25Z International audience In this paper, we re-investigate the isotopic composition of hydrogen in MORB and the possible effects of contamination on δD and water content. A suite of 40 N-MORB from the Pacific-Antarctic ridge, far from any hotspot, was analyzed for chlorine content by electron microprobe and for water content and δD with silica tubes. Cl concentrations (from 29 to 2400 ppm) indicate widespread contamination, more intense with faster spreading rates, while water contents (from 840 to 7800 ppm) are mainly controlled by igneous processes. δD values range from ‑76 to ‑48‰, with an average value of ‑61‰. The lack of correlation between Cl content and either H2O/Ce or δD indicate that contamination has a negligible effect on δD for our samples, which is therefore characteristic of the mantle below the Pacific-Antarctic ridge. We suggest that the 20‰ lower δD value reported for the North Pacific and North Atlantic is highly unlikely from geodynamical arguments. We propose that the convecting mantle is characterized by a δD of ‑60±5‰, as supported by the most recent data from North Atlantic N-MORB. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Université de Nantes: HAL-UNIV-NANTES Antarctic Pacific Earth and Planetary Science Letters 381 156 165 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
hydrogen isotopes mantle geochemistry mantle water [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
hydrogen isotopes mantle geochemistry mantle water [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Clog, Matthieu Aubaud, Cyril Cartigny, Pierre Dosso, Laure The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir |
topic_facet |
hydrogen isotopes mantle geochemistry mantle water [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience In this paper, we re-investigate the isotopic composition of hydrogen in MORB and the possible effects of contamination on δD and water content. A suite of 40 N-MORB from the Pacific-Antarctic ridge, far from any hotspot, was analyzed for chlorine content by electron microprobe and for water content and δD with silica tubes. Cl concentrations (from 29 to 2400 ppm) indicate widespread contamination, more intense with faster spreading rates, while water contents (from 840 to 7800 ppm) are mainly controlled by igneous processes. δD values range from ‑76 to ‑48‰, with an average value of ‑61‰. The lack of correlation between Cl content and either H2O/Ce or δD indicate that contamination has a negligible effect on δD for our samples, which is therefore characteristic of the mantle below the Pacific-Antarctic ridge. We suggest that the 20‰ lower δD value reported for the North Pacific and North Atlantic is highly unlikely from geodynamical arguments. We propose that the convecting mantle is characterized by a δD of ‑60±5‰, as supported by the most recent data from North Atlantic N-MORB. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Computer Science Department (CS CALTECH) California Institute of Technology (CALTECH) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Clog, Matthieu Aubaud, Cyril Cartigny, Pierre Dosso, Laure |
author_facet |
Clog, Matthieu Aubaud, Cyril Cartigny, Pierre Dosso, Laure |
author_sort |
Clog, Matthieu |
title |
The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir |
title_short |
The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir |
title_full |
The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir |
title_fullStr |
The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir |
title_full_unstemmed |
The hydrogen isotopic composition and water content of southern Pacific MORB: A reassessment of the D/H ratio of the depleted mantle reservoir |
title_sort |
hydrogen isotopic composition and water content of southern pacific morb: a reassessment of the d/h ratio of the depleted mantle reservoir |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00933598 https://hal-insu.archives-ouvertes.fr/insu-00933598/document https://hal-insu.archives-ouvertes.fr/insu-00933598/file/27274.pdf https://doi.org/10.1016/J.EPSL.2013.08.043 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal-insu.archives-ouvertes.fr/insu-00933598 Earth and Planetary Science Letters, 2013, 381, pp.156-165. ⟨10.1016/J.EPSL.2013.08.043⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/J.EPSL.2013.08.043 insu-00933598 https://hal-insu.archives-ouvertes.fr/insu-00933598 https://hal-insu.archives-ouvertes.fr/insu-00933598/document https://hal-insu.archives-ouvertes.fr/insu-00933598/file/27274.pdf BIBCODE: 2013E&PSL.381.156C doi:10.1016/J.EPSL.2013.08.043 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/J.EPSL.2013.08.043 |
container_title |
Earth and Planetary Science Letters |
container_volume |
381 |
container_start_page |
156 |
op_container_end_page |
165 |
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1766247059492438016 |