Barium isotopic composition of the mantle: Constraints from carbonatites
To investigate the behaviour of Ba isotopes during carbonatite petrogenesis and to explore the possibility of using carbonatites to constrain the Ba isotopic composition of the mantle, we report high-precision Ba isotopic analyses of: (1) carbonatites and associated silicate rocks from the only acti...
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ftkeeleuniv:oai:eprints.keele.ac.uk:6528 2023-07-30T04:03:49+02:00 Barium isotopic composition of the mantle: Constraints from carbonatites Li, W-Y Yu, H-M Xu, J Halama, R Bell, K Nan, X-Y Huang, F 2020-06-01 text https://eprints.keele.ac.uk/id/eprint/6528/ https://eprints.keele.ac.uk/id/eprint/6528/1/Li_et_al_2019_GCA_accepted.pdf https://doi.org/10.1016/j.gca.2019.06.041 en eng Elsevier https://eprints.keele.ac.uk/id/eprint/6528/1/Li_et_al_2019_GCA_accepted.pdf Li, W-Y, Yu, H-M, Xu, J, Halama, R orcid:0000-0002-9770-6784 , Bell, K, Nan, X-Y and Huang, F (2020) Barium isotopic composition of the mantle: Constraints from carbonatites. Geochimica et Cosmochimica Acta, 278. pp. 235-243. doi:10.1016/j.gca.2019.06.041 cc_by_nc_nd_4 QD Chemistry QE Geology Article PeerReviewed 2020 ftkeeleuniv https://doi.org/10.1016/j.gca.2019.06.041 2023-07-10T21:17:28Z To investigate the behaviour of Ba isotopes during carbonatite petrogenesis and to explore the possibility of using carbonatites to constrain the Ba isotopic composition of the mantle, we report high-precision Ba isotopic analyses of: (1) carbonatites and associated silicate rocks from the only active carbonatite volcano, Oldoinyo Lengai, Tanzania, and (2) Archean to Cenozoic carbonatites from Canada, East Africa, Germany and Greenland. Carbonatites and associated phonolites and nephelinites from Oldoinyo Lengai have similar δ137/134 Ba values that range from +0.01 to +0.03‰, indicating that Ba isotope fractionation during carbonatite petrogenesis is negligible. The limited variation in δ137/134 Ba values from −0.03 to +0.09‰ for most carbonatite samples suggests that their mantle sources have a relatively homogeneous Ba isotopic composition. Based on the carbonatites investigated in this work, the average δ137/134 Ba value of their mantle sources is estimated to be +0.04 ± 0.06‰ (2SD, n = 16), which is similar to the average value of +0.05 ± 0.06‰ for mid-ocean ridge basalts. The lower δ137/134 Ba value of −0.08‰ in a Canadian sample and higher δ137/134 Ba values of +0.14‰ and +0.23‰ in two Greenland samples suggest local mantle isotopic heterogeneity that may reflect the incorporation of recycled crustal materials in their sources. Article in Journal/Newspaper Greenland Keele University: Keele Research Repository Canada Greenland Geochimica et Cosmochimica Acta 278 235 243 |
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Open Polar |
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Keele University: Keele Research Repository |
op_collection_id |
ftkeeleuniv |
language |
English |
topic |
QD Chemistry QE Geology |
spellingShingle |
QD Chemistry QE Geology Li, W-Y Yu, H-M Xu, J Halama, R Bell, K Nan, X-Y Huang, F Barium isotopic composition of the mantle: Constraints from carbonatites |
topic_facet |
QD Chemistry QE Geology |
description |
To investigate the behaviour of Ba isotopes during carbonatite petrogenesis and to explore the possibility of using carbonatites to constrain the Ba isotopic composition of the mantle, we report high-precision Ba isotopic analyses of: (1) carbonatites and associated silicate rocks from the only active carbonatite volcano, Oldoinyo Lengai, Tanzania, and (2) Archean to Cenozoic carbonatites from Canada, East Africa, Germany and Greenland. Carbonatites and associated phonolites and nephelinites from Oldoinyo Lengai have similar δ137/134 Ba values that range from +0.01 to +0.03‰, indicating that Ba isotope fractionation during carbonatite petrogenesis is negligible. The limited variation in δ137/134 Ba values from −0.03 to +0.09‰ for most carbonatite samples suggests that their mantle sources have a relatively homogeneous Ba isotopic composition. Based on the carbonatites investigated in this work, the average δ137/134 Ba value of their mantle sources is estimated to be +0.04 ± 0.06‰ (2SD, n = 16), which is similar to the average value of +0.05 ± 0.06‰ for mid-ocean ridge basalts. The lower δ137/134 Ba value of −0.08‰ in a Canadian sample and higher δ137/134 Ba values of +0.14‰ and +0.23‰ in two Greenland samples suggest local mantle isotopic heterogeneity that may reflect the incorporation of recycled crustal materials in their sources. |
format |
Article in Journal/Newspaper |
author |
Li, W-Y Yu, H-M Xu, J Halama, R Bell, K Nan, X-Y Huang, F |
author_facet |
Li, W-Y Yu, H-M Xu, J Halama, R Bell, K Nan, X-Y Huang, F |
author_sort |
Li, W-Y |
title |
Barium isotopic composition of the mantle: Constraints from carbonatites |
title_short |
Barium isotopic composition of the mantle: Constraints from carbonatites |
title_full |
Barium isotopic composition of the mantle: Constraints from carbonatites |
title_fullStr |
Barium isotopic composition of the mantle: Constraints from carbonatites |
title_full_unstemmed |
Barium isotopic composition of the mantle: Constraints from carbonatites |
title_sort |
barium isotopic composition of the mantle: constraints from carbonatites |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://eprints.keele.ac.uk/id/eprint/6528/ https://eprints.keele.ac.uk/id/eprint/6528/1/Li_et_al_2019_GCA_accepted.pdf https://doi.org/10.1016/j.gca.2019.06.041 |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://eprints.keele.ac.uk/id/eprint/6528/1/Li_et_al_2019_GCA_accepted.pdf Li, W-Y, Yu, H-M, Xu, J, Halama, R orcid:0000-0002-9770-6784 , Bell, K, Nan, X-Y and Huang, F (2020) Barium isotopic composition of the mantle: Constraints from carbonatites. Geochimica et Cosmochimica Acta, 278. pp. 235-243. doi:10.1016/j.gca.2019.06.041 |
op_rights |
cc_by_nc_nd_4 |
op_doi |
https://doi.org/10.1016/j.gca.2019.06.041 |
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Geochimica et Cosmochimica Acta |
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278 |
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235 |
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243 |
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