Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX
Magma ascent rates control volcanic eruption styles. However, the rates at which basaltic magmas ascend through the crust remain highly uncertain. Although recent studies have successfully exploited records of decompression driven degassing to estimate the rates at which H 2 O-rich basalts ascend, s...
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ftfrontimediafig:oai:figshare.com:article/12457745 2023-05-15T16:50:02+02:00 Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX David A. Neave John Maclennan 2020-06-10T04:36:10Z https://doi.org/10.3389/feart.2020.00188.s009 https://figshare.com/articles/Table_1_Clinopyroxene_Dissolution_Records_Rapid_Magma_Ascent_XLSX/12457745 unknown doi:10.3389/feart.2020.00188.s009 https://figshare.com/articles/Table_1_Clinopyroxene_Dissolution_Records_Rapid_Magma_Ascent_XLSX/12457745 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change magma ascent rate plumbing system clinopyroxene dissolution basalt disequilibrium Iceland Dataset 2020 ftfrontimediafig https://doi.org/10.3389/feart.2020.00188.s009 2020-06-10T22:53:39Z Magma ascent rates control volcanic eruption styles. However, the rates at which basaltic magmas ascend through the crust remain highly uncertain. Although recent studies have successfully exploited records of decompression driven degassing to estimate the rates at which H 2 O-rich basalts ascend, such approaches cannot readily be applied to primitive and H 2 O-poor basalts that erupt in ocean island and mid-ocean ridge settings. Here we present magma ascent rates obtained by modeling the dissolution of clinopyroxene crystals in a wehrlitic nodule from the primitive Borgarhraun lava flow in North Iceland. High-Al 2 O 3 clinopyroxene core compositions are consistent with crystallization near the Moho (~800 MPa), whereas low-Al 2 O 3 clinopyroxene rims and inclusion compositions are consistent with crystallization at or near the surface. We interpret low-Al 2 O 3 rims and inclusions as the crystallized remnants of boundary layers formed by the dissolution of high-Al 2 O 3 clinopyroxene during magma ascent. By combining characteristic rim dissolution lengths of 50–100 μm with published experimental calibrations of clinopyroxene dissolution behavior, we estimate that the Borgarhraun magma most likely decompressed and ascended at rates of 3.0–15 kPa.s −1 and 0.11–0.53 m.s −1 , respectively. These rates are slightly faster than published estimates obtained by modeling the diffusive re-equilibration of olivine crystals, suggesting that the Borgarhraun magma either accelerated upwards or that it stalled briefly at depth prior to final ascent. Comparisons with other basaltic eruptions indicate that the H 2 O-poor magma that fed the dominantly effusive Borgarhraun eruption ascended at a similar rate to some H 2 O-rich magmas that have fed explosive eruptions in arc settings. Thus, magma ascent rates do not appear to correlate simply with magma H 2 O contents. Overall, our findings confirm that primitive and H 2 O-poor basalts can traverse the crust within days, and may erupt with little precursory warning of magma ascent. Dataset Iceland Ocean Island Frontiers: Figshare Borgarhraun ENVELOPE(-17.022,-17.022,65.810,65.810) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change magma ascent rate plumbing system clinopyroxene dissolution basalt disequilibrium Iceland |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change magma ascent rate plumbing system clinopyroxene dissolution basalt disequilibrium Iceland David A. Neave John Maclennan Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change magma ascent rate plumbing system clinopyroxene dissolution basalt disequilibrium Iceland |
description |
Magma ascent rates control volcanic eruption styles. However, the rates at which basaltic magmas ascend through the crust remain highly uncertain. Although recent studies have successfully exploited records of decompression driven degassing to estimate the rates at which H 2 O-rich basalts ascend, such approaches cannot readily be applied to primitive and H 2 O-poor basalts that erupt in ocean island and mid-ocean ridge settings. Here we present magma ascent rates obtained by modeling the dissolution of clinopyroxene crystals in a wehrlitic nodule from the primitive Borgarhraun lava flow in North Iceland. High-Al 2 O 3 clinopyroxene core compositions are consistent with crystallization near the Moho (~800 MPa), whereas low-Al 2 O 3 clinopyroxene rims and inclusion compositions are consistent with crystallization at or near the surface. We interpret low-Al 2 O 3 rims and inclusions as the crystallized remnants of boundary layers formed by the dissolution of high-Al 2 O 3 clinopyroxene during magma ascent. By combining characteristic rim dissolution lengths of 50–100 μm with published experimental calibrations of clinopyroxene dissolution behavior, we estimate that the Borgarhraun magma most likely decompressed and ascended at rates of 3.0–15 kPa.s −1 and 0.11–0.53 m.s −1 , respectively. These rates are slightly faster than published estimates obtained by modeling the diffusive re-equilibration of olivine crystals, suggesting that the Borgarhraun magma either accelerated upwards or that it stalled briefly at depth prior to final ascent. Comparisons with other basaltic eruptions indicate that the H 2 O-poor magma that fed the dominantly effusive Borgarhraun eruption ascended at a similar rate to some H 2 O-rich magmas that have fed explosive eruptions in arc settings. Thus, magma ascent rates do not appear to correlate simply with magma H 2 O contents. Overall, our findings confirm that primitive and H 2 O-poor basalts can traverse the crust within days, and may erupt with little precursory warning of magma ascent. |
format |
Dataset |
author |
David A. Neave John Maclennan |
author_facet |
David A. Neave John Maclennan |
author_sort |
David A. Neave |
title |
Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX |
title_short |
Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX |
title_full |
Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX |
title_fullStr |
Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX |
title_full_unstemmed |
Table_1_Clinopyroxene Dissolution Records Rapid Magma Ascent.XLSX |
title_sort |
table_1_clinopyroxene dissolution records rapid magma ascent.xlsx |
publishDate |
2020 |
url |
https://doi.org/10.3389/feart.2020.00188.s009 https://figshare.com/articles/Table_1_Clinopyroxene_Dissolution_Records_Rapid_Magma_Ascent_XLSX/12457745 |
long_lat |
ENVELOPE(-17.022,-17.022,65.810,65.810) |
geographic |
Borgarhraun |
geographic_facet |
Borgarhraun |
genre |
Iceland Ocean Island |
genre_facet |
Iceland Ocean Island |
op_relation |
doi:10.3389/feart.2020.00188.s009 https://figshare.com/articles/Table_1_Clinopyroxene_Dissolution_Records_Rapid_Magma_Ascent_XLSX/12457745 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2020.00188.s009 |
_version_ |
1766040219347320832 |