Volatile and trace element partitioning between apatite and alkaline melts
Apatite readily incorporates volatile and trace elements in its structure, and thus carries a record of pre-eruptive melt-fluid chemical and physical processes that play critical roles in magmatic evolution, eruption triggering, and eruptive style. However, the pressure (P), temperature (T), oxygen...
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ftnanyangtu:oai:dr.ntu.edu.sg:10356/170641 2023-10-29T02:31:56+01:00 Volatile and trace element partitioning between apatite and alkaline melts Li, Weiran Costa, Fidel Oppenheimer, Clive Nagashima, Kazuhide Asian School of the Environment Earth Observatory of Singapore 2023 https://hdl.handle.net/10356/170641 https://doi.org/10.1007/s00410-022-01985-8 en eng EOS Contribution Number 377 NRF-NRFI2017-06 Contributions to Mineralogy and Petrology Li, W., Costa, F., Oppenheimer, C. & Nagashima, K. (2023). Volatile and trace element partitioning between apatite and alkaline melts. Contributions To Mineralogy and Petrology, 178(2). https://dx.doi.org/10.1007/s00410-022-01985-8 0010-7999 https://hdl.handle.net/10356/170641 doi:10.1007/s00410-022-01985-8 2-s2.0-85146278670 2 178 © 2023 The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. Science::Geology Lattice Strain Rare Earth Element Journal Article 2023 ftnanyangtu https://doi.org/10.1007/s00410-022-01985-8 2023-09-29T00:22:50Z Apatite readily incorporates volatile and trace elements in its structure, and thus carries a record of pre-eruptive melt-fluid chemical and physical processes that play critical roles in magmatic evolution, eruption triggering, and eruptive style. However, the pressure (P), temperature (T), oxygen fugacity (fO2), and crystal-melt composition dependencies of apatite-melt elemental partition relations are only partially understood, notably for alkaline melts. Here, we report a comprehensive dataset for partitioning relations of volatiles (CO2, H2O, F, Cl, S) and 24 trace elements (including rare earth elements—REEs) between fluorapatite and phonolitic melts, based on in situ analyses of co-existing fluorapatite and melt inclusions in anorthoclase megacrystals from Erebus volcano (Antarctica). The trace monovalent cations (Li, K, Rb) have partition coefficients (D) of ≤ 0.02, lower than divalent cations (D < 0.4 for Mg, Pb, Ba, Mn; D≈ 5 for Sr) and trivalent cations (DREE + Y≈ 5–30, with Nd being the most compatible REE). We use the measured trace element partition coefficients to establish a lattice-strain model for fluorapatite and alkaline melts. Based on these observations along with experimental data from the literature, we propose a general model for estimating DREE + Y in fluorapatite and calc-alkaline/alkaline melts under a wide range of P–T conditions. We also use the lattice strain model and the Eu contents of apatite and the melt to develop a new Eu-in-apatite oxybarometer. Applying it to the Erebus fluorapatite and phonolitic melts, we find that fO2 of the system was 0.5 log units below the QFM (quartz–fayalite–magnetite reaction) buffer, consistent with the low sulphur partition coefficient we determined for apatite, and with the reduced nature of the melt reported by previous studies. The melt inclusions we analysed are much drier than the calculated melt derived from apatite-melt hygrometry, implying hydrogen reequilibration in melt inclusions during magma ascent. This has implications for magma ... Article in Journal/Newspaper Antarc* Antarctica DR-NTU (Digital Repository at Nanyang Technological University, Singapore) Contributions to Mineralogy and Petrology 178 2 |
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DR-NTU (Digital Repository at Nanyang Technological University, Singapore) |
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ftnanyangtu |
language |
English |
topic |
Science::Geology Lattice Strain Rare Earth Element |
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Science::Geology Lattice Strain Rare Earth Element Li, Weiran Costa, Fidel Oppenheimer, Clive Nagashima, Kazuhide Volatile and trace element partitioning between apatite and alkaline melts |
topic_facet |
Science::Geology Lattice Strain Rare Earth Element |
description |
Apatite readily incorporates volatile and trace elements in its structure, and thus carries a record of pre-eruptive melt-fluid chemical and physical processes that play critical roles in magmatic evolution, eruption triggering, and eruptive style. However, the pressure (P), temperature (T), oxygen fugacity (fO2), and crystal-melt composition dependencies of apatite-melt elemental partition relations are only partially understood, notably for alkaline melts. Here, we report a comprehensive dataset for partitioning relations of volatiles (CO2, H2O, F, Cl, S) and 24 trace elements (including rare earth elements—REEs) between fluorapatite and phonolitic melts, based on in situ analyses of co-existing fluorapatite and melt inclusions in anorthoclase megacrystals from Erebus volcano (Antarctica). The trace monovalent cations (Li, K, Rb) have partition coefficients (D) of ≤ 0.02, lower than divalent cations (D < 0.4 for Mg, Pb, Ba, Mn; D≈ 5 for Sr) and trivalent cations (DREE + Y≈ 5–30, with Nd being the most compatible REE). We use the measured trace element partition coefficients to establish a lattice-strain model for fluorapatite and alkaline melts. Based on these observations along with experimental data from the literature, we propose a general model for estimating DREE + Y in fluorapatite and calc-alkaline/alkaline melts under a wide range of P–T conditions. We also use the lattice strain model and the Eu contents of apatite and the melt to develop a new Eu-in-apatite oxybarometer. Applying it to the Erebus fluorapatite and phonolitic melts, we find that fO2 of the system was 0.5 log units below the QFM (quartz–fayalite–magnetite reaction) buffer, consistent with the low sulphur partition coefficient we determined for apatite, and with the reduced nature of the melt reported by previous studies. The melt inclusions we analysed are much drier than the calculated melt derived from apatite-melt hygrometry, implying hydrogen reequilibration in melt inclusions during magma ascent. This has implications for magma ... |
author2 |
Asian School of the Environment Earth Observatory of Singapore |
format |
Article in Journal/Newspaper |
author |
Li, Weiran Costa, Fidel Oppenheimer, Clive Nagashima, Kazuhide |
author_facet |
Li, Weiran Costa, Fidel Oppenheimer, Clive Nagashima, Kazuhide |
author_sort |
Li, Weiran |
title |
Volatile and trace element partitioning between apatite and alkaline melts |
title_short |
Volatile and trace element partitioning between apatite and alkaline melts |
title_full |
Volatile and trace element partitioning between apatite and alkaline melts |
title_fullStr |
Volatile and trace element partitioning between apatite and alkaline melts |
title_full_unstemmed |
Volatile and trace element partitioning between apatite and alkaline melts |
title_sort |
volatile and trace element partitioning between apatite and alkaline melts |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/170641 https://doi.org/10.1007/s00410-022-01985-8 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
EOS Contribution Number 377 NRF-NRFI2017-06 Contributions to Mineralogy and Petrology Li, W., Costa, F., Oppenheimer, C. & Nagashima, K. (2023). Volatile and trace element partitioning between apatite and alkaline melts. Contributions To Mineralogy and Petrology, 178(2). https://dx.doi.org/10.1007/s00410-022-01985-8 0010-7999 https://hdl.handle.net/10356/170641 doi:10.1007/s00410-022-01985-8 2-s2.0-85146278670 2 178 |
op_rights |
© 2023 The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. |
op_doi |
https://doi.org/10.1007/s00410-022-01985-8 |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
178 |
container_issue |
2 |
_version_ |
1781052822230401024 |