Barium isotopes in ocean island basalts as tracers of mantle processes
International audience The compositions of ocean island basalts (OIB) can record signatures of ancient subducted crust that has been recycled through the mantle. Based on their radiogenic isotope, major and trace element compositions, several geochemically-extreme mantle compositions are suggested t...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03839236 https://doi.org/10.1016/j.gca.2022.08.023 |
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ftinsu:oai:HAL:insu-03839236v1 2023-06-18T03:41:02+02:00 Barium isotopes in ocean island basalts as tracers of mantle processes Bai, Ruixia Jackson, Matthew G. Huang, Fang Moynier, Frédéric Devos, Gabriel Halldórsson, Sæmundur A. Lisiecki, Lorraine Yin, Haoming Peng, Yihang Nan, Xiaoyun Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2022 https://hal-insu.archives-ouvertes.fr/insu-03839236 https://doi.org/10.1016/j.gca.2022.08.023 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2022.08.023 insu-03839236 https://hal-insu.archives-ouvertes.fr/insu-03839236 BIBCODE: 2022GeCoA.336.436B doi:10.1016/j.gca.2022.08.023 ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal-insu.archives-ouvertes.fr/insu-03839236 Geochimica et Cosmochimica Acta, 2022, 336, pp.436-447. ⟨10.1016/j.gca.2022.08.023⟩ Mantle geochemistry Ocean island basalts (OIB) Barium isotopes Volcanic hotspots Crustal recycling [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.1016/j.gca.2022.08.023 2023-06-05T19:54:09Z International audience The compositions of ocean island basalts (OIB) can record signatures of ancient subducted crust that has been recycled through the mantle. Based on their radiogenic isotope, major and trace element compositions, several geochemically-extreme mantle compositions are suggested to host components of recycled crust. Barium (Ba) stable isotopes can serve as a tracer of crustal recycling into the mantle sources of OIB because 1) Ba isotopes are fractionated in surface crustal reservoirs and 2) Ba is highly enriched in crust relative to the mantle. Therefore, the Ba isotopic compositions of the subducted crust could be detected in OIB. Here, we characterized Ba isotopic compositions of fresh OIB from hotspots sampling a range of mantle compositions. We first explore δ 138/134 Ba (permil deviation of the 138 Ba/ 134 Ba ratio from the standard SRM3104a) in a suite of Hekla samples and demonstrate that magmatic differentiation does not impact the δ 138/134 Ba values of OIB over MgO concentrations from 2.3 to 8.0 wt%, and higher MgO lavas are unlikely to experience δ 138/134 Ba fractionation. After excluding OIB samples that experienced low-temperature alteration-which may shift the δ 138/134 Ba values of samples away from their mantle sources-the δ 138/134 Ba values of Samoan (including EM2 and high 3 He/ 4 He) lavas range from -0.07 to 0.07‰, while for Cook-Austral (HIMU) lavas the δ 138/134 Ba values range from 0.00 to 0.11‰, and for St. Helena (HIMU) samples the δ 138/134 Ba values range from 0.02 to 0.05‰. High 3 He/ 4 He (> 20 Ra, ratio to atmosphere) lavas from Vestfirðir of Iceland (-0.09 to 0.14‰) and Samoa (-0.02 to 0.01‰) also exhibit Ba isotopic variability. An extreme EM2 lava examined here ( 143 Nd/ 144 Nd = 0.512582) has lighter Ba isotopic composition (-0.07 ± 0.02‰, 2SE) than the depleted mantle sampled by MORB (0.05 ± 0.05‰, 2SD). The Samoan lavas show a possible positive trend between δ 138/134 Ba values and 143 Nd/ 144 Nd ratios, and can be modeled as a binary mixing between ... Article in Journal/Newspaper Hekla Iceland Ocean Island Institut national des sciences de l'Univers: HAL-INSU Austral St. Helena ENVELOPE(8.575,8.575,63.621,63.621) Vestfirðir ENVELOPE(-22.500,-22.500,65.667,65.667) Geochimica et Cosmochimica Acta 336 436 447 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Mantle geochemistry Ocean island basalts (OIB) Barium isotopes Volcanic hotspots Crustal recycling [SDU]Sciences of the Universe [physics] |
spellingShingle |
Mantle geochemistry Ocean island basalts (OIB) Barium isotopes Volcanic hotspots Crustal recycling [SDU]Sciences of the Universe [physics] Bai, Ruixia Jackson, Matthew G. Huang, Fang Moynier, Frédéric Devos, Gabriel Halldórsson, Sæmundur A. Lisiecki, Lorraine Yin, Haoming Peng, Yihang Nan, Xiaoyun Barium isotopes in ocean island basalts as tracers of mantle processes |
topic_facet |
Mantle geochemistry Ocean island basalts (OIB) Barium isotopes Volcanic hotspots Crustal recycling [SDU]Sciences of the Universe [physics] |
description |
International audience The compositions of ocean island basalts (OIB) can record signatures of ancient subducted crust that has been recycled through the mantle. Based on their radiogenic isotope, major and trace element compositions, several geochemically-extreme mantle compositions are suggested to host components of recycled crust. Barium (Ba) stable isotopes can serve as a tracer of crustal recycling into the mantle sources of OIB because 1) Ba isotopes are fractionated in surface crustal reservoirs and 2) Ba is highly enriched in crust relative to the mantle. Therefore, the Ba isotopic compositions of the subducted crust could be detected in OIB. Here, we characterized Ba isotopic compositions of fresh OIB from hotspots sampling a range of mantle compositions. We first explore δ 138/134 Ba (permil deviation of the 138 Ba/ 134 Ba ratio from the standard SRM3104a) in a suite of Hekla samples and demonstrate that magmatic differentiation does not impact the δ 138/134 Ba values of OIB over MgO concentrations from 2.3 to 8.0 wt%, and higher MgO lavas are unlikely to experience δ 138/134 Ba fractionation. After excluding OIB samples that experienced low-temperature alteration-which may shift the δ 138/134 Ba values of samples away from their mantle sources-the δ 138/134 Ba values of Samoan (including EM2 and high 3 He/ 4 He) lavas range from -0.07 to 0.07‰, while for Cook-Austral (HIMU) lavas the δ 138/134 Ba values range from 0.00 to 0.11‰, and for St. Helena (HIMU) samples the δ 138/134 Ba values range from 0.02 to 0.05‰. High 3 He/ 4 He (> 20 Ra, ratio to atmosphere) lavas from Vestfirðir of Iceland (-0.09 to 0.14‰) and Samoa (-0.02 to 0.01‰) also exhibit Ba isotopic variability. An extreme EM2 lava examined here ( 143 Nd/ 144 Nd = 0.512582) has lighter Ba isotopic composition (-0.07 ± 0.02‰, 2SE) than the depleted mantle sampled by MORB (0.05 ± 0.05‰, 2SD). The Samoan lavas show a possible positive trend between δ 138/134 Ba values and 143 Nd/ 144 Nd ratios, and can be modeled as a binary mixing between ... |
author2 |
Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Bai, Ruixia Jackson, Matthew G. Huang, Fang Moynier, Frédéric Devos, Gabriel Halldórsson, Sæmundur A. Lisiecki, Lorraine Yin, Haoming Peng, Yihang Nan, Xiaoyun |
author_facet |
Bai, Ruixia Jackson, Matthew G. Huang, Fang Moynier, Frédéric Devos, Gabriel Halldórsson, Sæmundur A. Lisiecki, Lorraine Yin, Haoming Peng, Yihang Nan, Xiaoyun |
author_sort |
Bai, Ruixia |
title |
Barium isotopes in ocean island basalts as tracers of mantle processes |
title_short |
Barium isotopes in ocean island basalts as tracers of mantle processes |
title_full |
Barium isotopes in ocean island basalts as tracers of mantle processes |
title_fullStr |
Barium isotopes in ocean island basalts as tracers of mantle processes |
title_full_unstemmed |
Barium isotopes in ocean island basalts as tracers of mantle processes |
title_sort |
barium isotopes in ocean island basalts as tracers of mantle processes |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03839236 https://doi.org/10.1016/j.gca.2022.08.023 |
long_lat |
ENVELOPE(8.575,8.575,63.621,63.621) ENVELOPE(-22.500,-22.500,65.667,65.667) |
geographic |
Austral St. Helena Vestfirðir |
geographic_facet |
Austral St. Helena Vestfirðir |
genre |
Hekla Iceland Ocean Island |
genre_facet |
Hekla Iceland Ocean Island |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal-insu.archives-ouvertes.fr/insu-03839236 Geochimica et Cosmochimica Acta, 2022, 336, pp.436-447. ⟨10.1016/j.gca.2022.08.023⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2022.08.023 insu-03839236 https://hal-insu.archives-ouvertes.fr/insu-03839236 BIBCODE: 2022GeCoA.336.436B doi:10.1016/j.gca.2022.08.023 |
op_doi |
https://doi.org/10.1016/j.gca.2022.08.023 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
336 |
container_start_page |
436 |
op_container_end_page |
447 |
_version_ |
1769006461313089536 |