The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P
Abstract This paper reports new software, PRIMELT3‐P, for computing the pressure and temperature range over which a primary basaltic magma was formed by adiabatic decompression and fractional melting of fertile mantle peridotite. The underlying model was developed to explore the meaning of magmatic...
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ftdoajarticles:oai:doaj.org/article:c7d6bdf851d64bfe9429acd04a3e2f07 2023-12-03T10:24:42+01:00 The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P Claude T. Herzberg Paul D. Asimow Juan David Hernández‐Montenegro 2023-01-01T00:00:00Z https://doi.org/10.1029/2022GC010657 https://doaj.org/article/c7d6bdf851d64bfe9429acd04a3e2f07 EN eng Wiley https://doi.org/10.1029/2022GC010657 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2022GC010657 https://doaj.org/article/c7d6bdf851d64bfe9429acd04a3e2f07 Geochemistry, Geophysics, Geosystems, Vol 24, Iss 1, Pp n/a-n/a (2023) Geochemistry Geophysics Geosystems Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.1029/2022GC010657 2023-11-05T01:35:55Z Abstract This paper reports new software, PRIMELT3‐P, for computing the pressure and temperature range over which a primary basaltic magma was formed by adiabatic decompression and fractional melting of fertile mantle peridotite. The underlying model was developed to explore the meaning of magmatic pressure and its connection to the physics of mantle melting, melt extraction, and melt migration. We present a comparison of the results of the batch melting model FractionatePT3 (Lee et al., 2009, https://doi.org/10.1016/j.epsl.2008.12.020) and the new fractional melting model PRIMELT3‐P, each applied to basalts from various localities, with a particular focus on Hawai'i and Iceland. The unexpected result is that pressures for batch melting and fractional melting are quite similar across a broad range of potential temperatures, agreeing to within ±0.29 GPa (1σ) when applied to magmas that pass tests for derivation from peridotite sources. Although samples from both Hawai'i and Iceland yield a range of final pressures of melting, the minimum final pressure in each location coincides with independent geophysical constraints—the depth to the lithosphere‐asthenosphere boundary beneath Hawai'i and to the Moho below Iceland. These results clarify the meaning of primary magma pressure, but the concept remains complex. We suggest that computed temperature and pressure arrays arising from heterogeneous peridotite‐source primary magmas may reflect melt transport and mixing in a thermally zoned mantle plume with a complex network of branching melt channels that nucleate over a range of depths. Article in Journal/Newspaper Iceland Directory of Open Access Journals: DOAJ Articles Geochemistry, Geophysics, Geosystems 24 1 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Geochemistry Geophysics Geosystems Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
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Geochemistry Geophysics Geosystems Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Claude T. Herzberg Paul D. Asimow Juan David Hernández‐Montenegro The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P |
topic_facet |
Geochemistry Geophysics Geosystems Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract This paper reports new software, PRIMELT3‐P, for computing the pressure and temperature range over which a primary basaltic magma was formed by adiabatic decompression and fractional melting of fertile mantle peridotite. The underlying model was developed to explore the meaning of magmatic pressure and its connection to the physics of mantle melting, melt extraction, and melt migration. We present a comparison of the results of the batch melting model FractionatePT3 (Lee et al., 2009, https://doi.org/10.1016/j.epsl.2008.12.020) and the new fractional melting model PRIMELT3‐P, each applied to basalts from various localities, with a particular focus on Hawai'i and Iceland. The unexpected result is that pressures for batch melting and fractional melting are quite similar across a broad range of potential temperatures, agreeing to within ±0.29 GPa (1σ) when applied to magmas that pass tests for derivation from peridotite sources. Although samples from both Hawai'i and Iceland yield a range of final pressures of melting, the minimum final pressure in each location coincides with independent geophysical constraints—the depth to the lithosphere‐asthenosphere boundary beneath Hawai'i and to the Moho below Iceland. These results clarify the meaning of primary magma pressure, but the concept remains complex. We suggest that computed temperature and pressure arrays arising from heterogeneous peridotite‐source primary magmas may reflect melt transport and mixing in a thermally zoned mantle plume with a complex network of branching melt channels that nucleate over a range of depths. |
format |
Article in Journal/Newspaper |
author |
Claude T. Herzberg Paul D. Asimow Juan David Hernández‐Montenegro |
author_facet |
Claude T. Herzberg Paul D. Asimow Juan David Hernández‐Montenegro |
author_sort |
Claude T. Herzberg |
title |
The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P |
title_short |
The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P |
title_full |
The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P |
title_fullStr |
The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P |
title_full_unstemmed |
The Meaning of Pressure for Primary Magmas: New Insights From PRIMELT3‐P |
title_sort |
meaning of pressure for primary magmas: new insights from primelt3‐p |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022GC010657 https://doaj.org/article/c7d6bdf851d64bfe9429acd04a3e2f07 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 24, Iss 1, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2022GC010657 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2022GC010657 https://doaj.org/article/c7d6bdf851d64bfe9429acd04a3e2f07 |
op_doi |
https://doi.org/10.1029/2022GC010657 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
24 |
container_issue |
1 |
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1784273208515493888 |