Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand
International audience Breccia-filled eruption conduits are dynamic systems where pressures frequently exceed critical thresholds, generating earthquakes and transmitting fluids. To assess the dynamics of breccia-filled conduits, we examine lava, ash tuff, and hydrothermal breccia ballistics with va...
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Online Access: | https://hal.science/hal-03008368 https://hal.science/hal-03008368/document https://hal.science/hal-03008368/file/Kennedy%20et%20al.%20Geosciences%202020.pdf https://doi.org/10.3390/geosciences10040138 |
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ftinsu:oai:HAL:hal-03008368v1 2023-06-18T03:43:26+02:00 Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand Kennedy, Ben, Farquhar, Aaron Hilderman, Robin Villeneuve, Marlène, Heap, Michael, Mordensky, Stan Kilgour, Geoffrey Jolly, Art Christenson, Bruce Reuschle, Thierry University of Canterbury Christchurch Montanuniversität Leoben (MUL) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) GNS Science 2020 https://hal.science/hal-03008368 https://hal.science/hal-03008368/document https://hal.science/hal-03008368/file/Kennedy%20et%20al.%20Geosciences%202020.pdf https://doi.org/10.3390/geosciences10040138 en eng HAL CCSD MDPI info:eu-repo/semantics/altIdentifier/doi/10.3390/geosciences10040138 hal-03008368 https://hal.science/hal-03008368 https://hal.science/hal-03008368/document https://hal.science/hal-03008368/file/Kennedy%20et%20al.%20Geosciences%202020.pdf doi:10.3390/geosciences10040138 info:eu-repo/semantics/OpenAccess ISSN: 2076-3263 Geosciences https://hal.science/hal-03008368 Geosciences, 2020, 10 (4), pp.138. ⟨10.3390/geosciences10040138⟩ alteration porosity eruption fracture permeability [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.3390/geosciences10040138 2023-06-05T22:25:20Z International audience Breccia-filled eruption conduits are dynamic systems where pressures frequently exceed critical thresholds, generating earthquakes and transmitting fluids. To assess the dynamics of breccia-filled conduits, we examine lava, ash tuff, and hydrothermal breccia ballistics with varying alteration, veining, fractures, and brecciation ejected during the 27 April 2016 phreatic eruption of Whakaari/White Island. We measure connected porosity, strength, and permeability with and without tensile fractures at a range of confining pressures. Many samples are progressively altered with anhydrite, alunite, and silica polymorphs. The measurements show a large range of connected porosity, permeability, and strength. In contrast, the cracked samples show a consistently high permeability. The cracked altered samples have a permeability more sensitive to confining pressure than the unaltered samples. The permeability of our altered ballistics is lower than surface rocks of equivalent porosity, illustrating that mineral precipitation locally blocked pores and cracks. We surmise that alteration within the conduit breccia allows cracks to form, open and close, in response to pore pressure and confining pressure, providing a mechanism for frequent and variable fluid advection pulses to the surface. This produces temporally and spatially variable geophysical and geochemical observations and has implications for volcano monitoring for any volcano system with significant hydrothermal activity. Article in Journal/Newspaper White Island Institut national des sciences de l'Univers: HAL-INSU New Zealand White Island ENVELOPE(48.583,48.583,-66.733,-66.733) Geosciences 10 4 138 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
alteration porosity eruption fracture permeability [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
alteration porosity eruption fracture permeability [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Kennedy, Ben, Farquhar, Aaron Hilderman, Robin Villeneuve, Marlène, Heap, Michael, Mordensky, Stan Kilgour, Geoffrey Jolly, Art Christenson, Bruce Reuschle, Thierry Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand |
topic_facet |
alteration porosity eruption fracture permeability [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience Breccia-filled eruption conduits are dynamic systems where pressures frequently exceed critical thresholds, generating earthquakes and transmitting fluids. To assess the dynamics of breccia-filled conduits, we examine lava, ash tuff, and hydrothermal breccia ballistics with varying alteration, veining, fractures, and brecciation ejected during the 27 April 2016 phreatic eruption of Whakaari/White Island. We measure connected porosity, strength, and permeability with and without tensile fractures at a range of confining pressures. Many samples are progressively altered with anhydrite, alunite, and silica polymorphs. The measurements show a large range of connected porosity, permeability, and strength. In contrast, the cracked samples show a consistently high permeability. The cracked altered samples have a permeability more sensitive to confining pressure than the unaltered samples. The permeability of our altered ballistics is lower than surface rocks of equivalent porosity, illustrating that mineral precipitation locally blocked pores and cracks. We surmise that alteration within the conduit breccia allows cracks to form, open and close, in response to pore pressure and confining pressure, providing a mechanism for frequent and variable fluid advection pulses to the surface. This produces temporally and spatially variable geophysical and geochemical observations and has implications for volcano monitoring for any volcano system with significant hydrothermal activity. |
author2 |
University of Canterbury Christchurch Montanuniversität Leoben (MUL) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) GNS Science |
format |
Article in Journal/Newspaper |
author |
Kennedy, Ben, Farquhar, Aaron Hilderman, Robin Villeneuve, Marlène, Heap, Michael, Mordensky, Stan Kilgour, Geoffrey Jolly, Art Christenson, Bruce Reuschle, Thierry |
author_facet |
Kennedy, Ben, Farquhar, Aaron Hilderman, Robin Villeneuve, Marlène, Heap, Michael, Mordensky, Stan Kilgour, Geoffrey Jolly, Art Christenson, Bruce Reuschle, Thierry |
author_sort |
Kennedy, Ben, |
title |
Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand |
title_short |
Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand |
title_full |
Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand |
title_fullStr |
Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand |
title_full_unstemmed |
Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand |
title_sort |
pressure controlled permeability in a conduit filled with fractured hydrothermal breccia reconstructed from ballistics from whakaari (white island), new zealand |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03008368 https://hal.science/hal-03008368/document https://hal.science/hal-03008368/file/Kennedy%20et%20al.%20Geosciences%202020.pdf https://doi.org/10.3390/geosciences10040138 |
long_lat |
ENVELOPE(48.583,48.583,-66.733,-66.733) |
geographic |
New Zealand White Island |
geographic_facet |
New Zealand White Island |
genre |
White Island |
genre_facet |
White Island |
op_source |
ISSN: 2076-3263 Geosciences https://hal.science/hal-03008368 Geosciences, 2020, 10 (4), pp.138. ⟨10.3390/geosciences10040138⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3390/geosciences10040138 hal-03008368 https://hal.science/hal-03008368 https://hal.science/hal-03008368/document https://hal.science/hal-03008368/file/Kennedy%20et%20al.%20Geosciences%202020.pdf doi:10.3390/geosciences10040138 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3390/geosciences10040138 |
container_title |
Geosciences |
container_volume |
10 |
container_issue |
4 |
container_start_page |
138 |
_version_ |
1769009878653730816 |