The isotope composition of inorganic germanium in seawater and deep sea sponges
International audience Although dissolved concentrations of germanium (Ge) and silicon (Si) in modern seawater are tightlycorrelated, uncertainties still exist in the modern marine Ge cycle. Germanium stable isotope systematics inmarine systems should provide additional constraints on marine Ge sour...
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ftunivbrest:oai:HAL:hal-01919348v1 2024-04-28T08:17:12+00:00 The isotope composition of inorganic germanium in seawater and deep sea sponges Guillermic, Maxence Lalonde, Stefan Hendry, Katharine, R Rouxel, Olivier, J. Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) School of Earth Sciences Bristol University of Bristol Bristol Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) 2017-09 https://hal.univ-brest.fr/hal-01919348 https://hal.univ-brest.fr/hal-01919348/document https://hal.univ-brest.fr/hal-01919348/file/50529.pdf https://doi.org/10.1016/j.gca.2017.06.011 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2017.06.011 hal-01919348 https://hal.univ-brest.fr/hal-01919348 https://hal.univ-brest.fr/hal-01919348/document https://hal.univ-brest.fr/hal-01919348/file/50529.pdf doi:10.1016/j.gca.2017.06.011 info:eu-repo/semantics/OpenAccess ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.univ-brest.fr/hal-01919348 Geochimica et Cosmochimica Acta, 2017, 212, pp.99 - 118. ⟨10.1016/j.gca.2017.06.011⟩ stable isotopes germanium silicon sponges Southern Ocean chemical oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology info:eu-repo/semantics/article Journal articles 2017 ftunivbrest https://doi.org/10.1016/j.gca.2017.06.011 2024-04-10T23:47:36Z International audience Although dissolved concentrations of germanium (Ge) and silicon (Si) in modern seawater are tightlycorrelated, uncertainties still exist in the modern marine Ge cycle. Germanium stable isotope systematics inmarine systems should provide additional constraints on marine Ge sources and sinks, however the lowconcentration of Ge in seawater presents an analytical challenge for isotopic measurement. Here, we presenta new method of pre-concentration of inorganic Ge from seawater which was applied to measure three Geisotope profiles in the Southern Ocean and deep seawater from the Atlantic and Pacific Oceans. Germaniumisotopic measurements were performed on Ge amounts as low as 2.6 ng using a double-spike approach anda hydride generation system coupled to a MC-ICP-MS. Germanium was co-precipitated with iron hydroxideand then purified through anion-exchange chromatography. Results for the deep (i.e. > 1000 m depth) PacificOcean off Hawaii (nearby Loihi Seamount) and the deep Atlantic off Bermuda (BATS station) showed nearlyidentical δ74/70Ge values at 3.19 ± 0.31 ‰ (2SD, n = 9) and 2.93 ± 0.10 ‰ (2SD, n = 2), respectively.Vertical distributions of Ge concentration and isotope composition in the deep Southern Ocean for waterdepth > 1300 m yielded an average δ74/70Ge = 3.13 ± 0.25 ‰ (2SD, n = 14) and Ge/Si = 0.80 ± 0.09μmol/mol (2SD, n = 12). Significant variations in δ74/70Ge, from 2.62 to 3.71 ‰, were measured in the first1000 m in one station of the Southern Ocean near Sars Seamount in the Drake Passage, with the heaviestvalues measured in surface waters. Isotope fractionation by diatoms during opal biomineralization mayexplain the enrichment in heavy isotopes for both Ge and Si in surface seawater. However, examination ofboth oceanographic parameters and δ74/70Ge values suggest also that water mass mixing and potentialcontribution of shelf-derived Ge also could contribute to the variations. Combining these results with new Geisotope data for deep-sea sponges sampled nearby allowed us to ... Article in Journal/Newspaper Drake Passage Southern Ocean Université de Bretagne Occidentale: HAL Geochimica et Cosmochimica Acta 212 99 118 |
institution |
Open Polar |
collection |
Université de Bretagne Occidentale: HAL |
op_collection_id |
ftunivbrest |
language |
English |
topic |
stable isotopes germanium silicon sponges Southern Ocean chemical oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology |
spellingShingle |
stable isotopes germanium silicon sponges Southern Ocean chemical oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology Guillermic, Maxence Lalonde, Stefan Hendry, Katharine, R Rouxel, Olivier, J. The isotope composition of inorganic germanium in seawater and deep sea sponges |
topic_facet |
stable isotopes germanium silicon sponges Southern Ocean chemical oceanography [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology |
description |
International audience Although dissolved concentrations of germanium (Ge) and silicon (Si) in modern seawater are tightlycorrelated, uncertainties still exist in the modern marine Ge cycle. Germanium stable isotope systematics inmarine systems should provide additional constraints on marine Ge sources and sinks, however the lowconcentration of Ge in seawater presents an analytical challenge for isotopic measurement. Here, we presenta new method of pre-concentration of inorganic Ge from seawater which was applied to measure three Geisotope profiles in the Southern Ocean and deep seawater from the Atlantic and Pacific Oceans. Germaniumisotopic measurements were performed on Ge amounts as low as 2.6 ng using a double-spike approach anda hydride generation system coupled to a MC-ICP-MS. Germanium was co-precipitated with iron hydroxideand then purified through anion-exchange chromatography. Results for the deep (i.e. > 1000 m depth) PacificOcean off Hawaii (nearby Loihi Seamount) and the deep Atlantic off Bermuda (BATS station) showed nearlyidentical δ74/70Ge values at 3.19 ± 0.31 ‰ (2SD, n = 9) and 2.93 ± 0.10 ‰ (2SD, n = 2), respectively.Vertical distributions of Ge concentration and isotope composition in the deep Southern Ocean for waterdepth > 1300 m yielded an average δ74/70Ge = 3.13 ± 0.25 ‰ (2SD, n = 14) and Ge/Si = 0.80 ± 0.09μmol/mol (2SD, n = 12). Significant variations in δ74/70Ge, from 2.62 to 3.71 ‰, were measured in the first1000 m in one station of the Southern Ocean near Sars Seamount in the Drake Passage, with the heaviestvalues measured in surface waters. Isotope fractionation by diatoms during opal biomineralization mayexplain the enrichment in heavy isotopes for both Ge and Si in surface seawater. However, examination ofboth oceanographic parameters and δ74/70Ge values suggest also that water mass mixing and potentialcontribution of shelf-derived Ge also could contribute to the variations. Combining these results with new Geisotope data for deep-sea sponges sampled nearby allowed us to ... |
author2 |
Laboratoire Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) School of Earth Sciences Bristol University of Bristol Bristol Unité Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) |
format |
Article in Journal/Newspaper |
author |
Guillermic, Maxence Lalonde, Stefan Hendry, Katharine, R Rouxel, Olivier, J. |
author_facet |
Guillermic, Maxence Lalonde, Stefan Hendry, Katharine, R Rouxel, Olivier, J. |
author_sort |
Guillermic, Maxence |
title |
The isotope composition of inorganic germanium in seawater and deep sea sponges |
title_short |
The isotope composition of inorganic germanium in seawater and deep sea sponges |
title_full |
The isotope composition of inorganic germanium in seawater and deep sea sponges |
title_fullStr |
The isotope composition of inorganic germanium in seawater and deep sea sponges |
title_full_unstemmed |
The isotope composition of inorganic germanium in seawater and deep sea sponges |
title_sort |
isotope composition of inorganic germanium in seawater and deep sea sponges |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.univ-brest.fr/hal-01919348 https://hal.univ-brest.fr/hal-01919348/document https://hal.univ-brest.fr/hal-01919348/file/50529.pdf https://doi.org/10.1016/j.gca.2017.06.011 |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.univ-brest.fr/hal-01919348 Geochimica et Cosmochimica Acta, 2017, 212, pp.99 - 118. ⟨10.1016/j.gca.2017.06.011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2017.06.011 hal-01919348 https://hal.univ-brest.fr/hal-01919348 https://hal.univ-brest.fr/hal-01919348/document https://hal.univ-brest.fr/hal-01919348/file/50529.pdf doi:10.1016/j.gca.2017.06.011 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.gca.2017.06.011 |
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Geochimica et Cosmochimica Acta |
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212 |
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99 |
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118 |
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