Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, Philippines
We investigate whether decompression rates derived from three often-disparate petrologic techniques (microlites, bubbles, and melt embayments) can be reconciled or integrated for a more complete understanding of magma ascent in the conduit. We focus on the well-studied and -documented earliest Plini...
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| Format: | Article |
| Language: | English |
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Volcanica
2024-03-01
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| Series: | Volcanica |
| Subjects: | |
| Online Access: | https://www.jvolcanica.org/ojs/index.php/volcanica/article/view/208 |
| _version_ | 1797289791849496576 |
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| author | Megan Harris Behnaz Hosseini Madison Myers Logan Bouley |
| author_facet | Megan Harris Behnaz Hosseini Madison Myers Logan Bouley |
| author_sort | Megan Harris |
| collection | DOAJ |
| description | We investigate whether decompression rates derived from three often-disparate petrologic techniques (microlites, bubbles, and melt embayments) can be reconciled or integrated for a more complete understanding of magma ascent in the conduit. We focus on the well-studied and -documented earliest Plinian eruptions (June 12, 1991) of Mount Pinatubo. Using a newly developed two-stage decompression-diffusion model, volatile profiles in quartz-hosted embayments reveal an initial stage of decompression nearly two orders of magnitude slower than final rates. In applying time-integrated models of microlite and bubble nucleation and growth, initial decompression rates from embayments are supported by microlite modeling results, whereas final rates are in close agreement with bubble number densities. This consistency and continuity between speedometers supports the sensitivity of different petrologic recorders to specific regions of the conduit system and highlights the fidelity of embayments as recorders of decompression throughout the entire conduit. Ascent timescales derived from Pinatubo embayments range from hours to days, coinciding with the visual onset of lava effusion leading to explosive activity. |
| first_indexed | 2024-03-07T19:11:07Z |
| format | Article |
| id | doaj.art-384e4a7c8ff443a3866d3c260f96a972 |
| institution | Directory Open Access Journal |
| issn | 2610-3540 |
| language | English |
| last_indexed | 2024-03-07T19:11:07Z |
| publishDate | 2024-03-01 |
| publisher | Volcanica |
| record_format | Article |
| series | Volcanica |
| spelling | doaj.art-384e4a7c8ff443a3866d3c260f96a9722024-03-01T01:17:51ZengVolcanicaVolcanica2610-35402024-03-017111713310.30909/vol.07.01.117133193Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, PhilippinesMegan Harris0https://orcid.org/0000-0002-9644-6896Behnaz Hosseini1https://orcid.org/0000-0003-1035-4323Madison Myers2https://orcid.org/0000-0003-2271-4445Logan Bouley3https://orcid.org/0009-0007-5457-1027Montana State UniversityMontana State UniversityMontana State UniversityMontana State UniversityWe investigate whether decompression rates derived from three often-disparate petrologic techniques (microlites, bubbles, and melt embayments) can be reconciled or integrated for a more complete understanding of magma ascent in the conduit. We focus on the well-studied and -documented earliest Plinian eruptions (June 12, 1991) of Mount Pinatubo. Using a newly developed two-stage decompression-diffusion model, volatile profiles in quartz-hosted embayments reveal an initial stage of decompression nearly two orders of magnitude slower than final rates. In applying time-integrated models of microlite and bubble nucleation and growth, initial decompression rates from embayments are supported by microlite modeling results, whereas final rates are in close agreement with bubble number densities. This consistency and continuity between speedometers supports the sensitivity of different petrologic recorders to specific regions of the conduit system and highlights the fidelity of embayments as recorders of decompression throughout the entire conduit. Ascent timescales derived from Pinatubo embayments range from hours to days, coinciding with the visual onset of lava effusion leading to explosive activity.https://www.jvolcanica.org/ojs/index.php/volcanica/article/view/208numerical modellingbubblesmicrolitesembaymentsdecompression |
| spellingShingle | Megan Harris Behnaz Hosseini Madison Myers Logan Bouley Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, Philippines Volcanica numerical modelling bubbles microlites embayments decompression |
| title | Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, Philippines |
| title_full | Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, Philippines |
| title_fullStr | Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, Philippines |
| title_full_unstemmed | Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, Philippines |
| title_short | Reconciling petrologic magma ascent speedometers for the June 12th, 1991 eruption of Mt. Pinatubo, Philippines |
| title_sort | reconciling petrologic magma ascent speedometers for the june 12th 1991 eruption of mt pinatubo philippines |
| topic | numerical modelling bubbles microlites embayments decompression |
| url | https://www.jvolcanica.org/ojs/index.php/volcanica/article/view/208 |
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