Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans
A suite of 34 volcanic gas condensates and particulates from Kilauea (Hawaii), Mt. Etna and Vulcano (Italy), Mt. Merapi (Indonesia), White Island and Mt. Nguaruhoe (New Zealand) were analysed for both Tl isotope compositions and Tl/Pb ratios. When considered together with published Tl-Pb abundance d...
Published in: | Geochimica et Cosmochimica Acta |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
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Online Access: | https://doi.org/10.1016/j.gca.2009.07.014 https://ora.ox.ac.uk/objects/uuid:2f6bd18b-7b23-4aeb-8977-0174f630f195 |
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ftuloxford:oai:ora.ox.ac.uk:uuid:2f6bd18b-7b23-4aeb-8977-0174f630f195 2023-05-15T18:43:37+02:00 Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans Baker, R Rehkämper, M Hinkley, T Nielsen, S Toutain, J 2016-07-28 https://doi.org/10.1016/j.gca.2009.07.014 https://ora.ox.ac.uk/objects/uuid:2f6bd18b-7b23-4aeb-8977-0174f630f195 eng eng Elsevier doi:10.1016/j.gca.2009.07.014 https://ora.ox.ac.uk/objects/uuid:2f6bd18b-7b23-4aeb-8977-0174f630f195 https://doi.org/10.1016/j.gca.2009.07.014 info:eu-repo/semantics/embargoedAccess Earth sciences Journal article 2016 ftuloxford https://doi.org/10.1016/j.gca.2009.07.014 2022-06-28T20:09:00Z A suite of 34 volcanic gas condensates and particulates from Kilauea (Hawaii), Mt. Etna and Vulcano (Italy), Mt. Merapi (Indonesia), White Island and Mt. Nguaruhoe (New Zealand) were analysed for both Tl isotope compositions and Tl/Pb ratios. When considered together with published Tl-Pb abundance data, the measurements provide globally representative best estimates of Tl/Pb = 0.46 ± 0.25 and ε205Tl = -1.7 ± 2.0 for the emissions of subaerial volcanism to the atmosphere and oceans (ε205Tl is the deviation of the 205Tl/203Tl isotope ratio from NIST SRM 997 isotope standard in parts per 10,000). Compared to igneous rocks of the crust and mantle, volcanic gases were found to have (i) Tl/Pb ratios that are typically about an order of magnitude higher, and (ii) significantly more variable Tl isotope compositions but a mean ε205Tl value that is indistinguishable from estimates for the Earth's mantle and continental crust. The first observation can be explained by the more volatile nature of Tl compared to Pb during the production of volcanic gases, whilst the second reflects the contrasting and approximately balanced isotope fractionation effects that are generated by partial evaporation of Tl during magma degassing and partial Tl condensation as a result of the cooling and differentiation of volcanic gases. Mass balance calculations, based on results from this and other recent Tl isotope studies, were carried out to investigate whether temporal changes in the volcanic Tl fluxes could be responsible for the dramatic shift in the ε205Tl value of the oceans at ~55 ma, which has been inferred from Tl isotope time series data for ferromanganese crusts. The calculations demonstrate that even large changes in the marine Tl input fluxes from volcanism and other sources are unable to significantly alter the Tl isotope composition of the oceans. Based on modelling, it is shown that the large inferred change in the ε205Tl value of seawater is best explained if the oceans of the early Cenozoic featured significantly larger Tl ... Article in Journal/Newspaper White Island ORA - Oxford University Research Archive New Zealand White Island ENVELOPE(48.583,48.583,-66.733,-66.733) Geochimica et Cosmochimica Acta 73 20 6340 6359 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
topic |
Earth sciences |
spellingShingle |
Earth sciences Baker, R Rehkämper, M Hinkley, T Nielsen, S Toutain, J Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans |
topic_facet |
Earth sciences |
description |
A suite of 34 volcanic gas condensates and particulates from Kilauea (Hawaii), Mt. Etna and Vulcano (Italy), Mt. Merapi (Indonesia), White Island and Mt. Nguaruhoe (New Zealand) were analysed for both Tl isotope compositions and Tl/Pb ratios. When considered together with published Tl-Pb abundance data, the measurements provide globally representative best estimates of Tl/Pb = 0.46 ± 0.25 and ε205Tl = -1.7 ± 2.0 for the emissions of subaerial volcanism to the atmosphere and oceans (ε205Tl is the deviation of the 205Tl/203Tl isotope ratio from NIST SRM 997 isotope standard in parts per 10,000). Compared to igneous rocks of the crust and mantle, volcanic gases were found to have (i) Tl/Pb ratios that are typically about an order of magnitude higher, and (ii) significantly more variable Tl isotope compositions but a mean ε205Tl value that is indistinguishable from estimates for the Earth's mantle and continental crust. The first observation can be explained by the more volatile nature of Tl compared to Pb during the production of volcanic gases, whilst the second reflects the contrasting and approximately balanced isotope fractionation effects that are generated by partial evaporation of Tl during magma degassing and partial Tl condensation as a result of the cooling and differentiation of volcanic gases. Mass balance calculations, based on results from this and other recent Tl isotope studies, were carried out to investigate whether temporal changes in the volcanic Tl fluxes could be responsible for the dramatic shift in the ε205Tl value of the oceans at ~55 ma, which has been inferred from Tl isotope time series data for ferromanganese crusts. The calculations demonstrate that even large changes in the marine Tl input fluxes from volcanism and other sources are unable to significantly alter the Tl isotope composition of the oceans. Based on modelling, it is shown that the large inferred change in the ε205Tl value of seawater is best explained if the oceans of the early Cenozoic featured significantly larger Tl ... |
format |
Article in Journal/Newspaper |
author |
Baker, R Rehkämper, M Hinkley, T Nielsen, S Toutain, J |
author_facet |
Baker, R Rehkämper, M Hinkley, T Nielsen, S Toutain, J |
author_sort |
Baker, R |
title |
Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans |
title_short |
Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans |
title_full |
Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans |
title_fullStr |
Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans |
title_full_unstemmed |
Investigation of thallium fluxes from subaerial volcanism - Implications for the present and past mass balance of thallium in the oceans |
title_sort |
investigation of thallium fluxes from subaerial volcanism - implications for the present and past mass balance of thallium in the oceans |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://doi.org/10.1016/j.gca.2009.07.014 https://ora.ox.ac.uk/objects/uuid:2f6bd18b-7b23-4aeb-8977-0174f630f195 |
long_lat |
ENVELOPE(48.583,48.583,-66.733,-66.733) |
geographic |
New Zealand White Island |
geographic_facet |
New Zealand White Island |
genre |
White Island |
genre_facet |
White Island |
op_relation |
doi:10.1016/j.gca.2009.07.014 https://ora.ox.ac.uk/objects/uuid:2f6bd18b-7b23-4aeb-8977-0174f630f195 https://doi.org/10.1016/j.gca.2009.07.014 |
op_rights |
info:eu-repo/semantics/embargoedAccess |
op_doi |
https://doi.org/10.1016/j.gca.2009.07.014 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
73 |
container_issue |
20 |
container_start_page |
6340 |
op_container_end_page |
6359 |
_version_ |
1766234047067979776 |