The Role of Tuffs in Sealing Volcanic Conduits
Abstract Acid‐sulphate alteration commonly changes the physicochemical properties of volcanic conduits. Although several conduit pressurization models suggest hydrothermal sealing, little experimental evidence exists from conduit‐filling rocks on the development of such a seal. Here we show that aci...
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| Format: | Article |
| Language: | English |
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Wiley
2021-10-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2021GL095175 |
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| author | Shreya Kanakiya Ludmila Adam Michael C. Rowe Jan M. Lindsay Lionel Esteban |
| author_facet | Shreya Kanakiya Ludmila Adam Michael C. Rowe Jan M. Lindsay Lionel Esteban |
| author_sort | Shreya Kanakiya |
| collection | DOAJ |
| description | Abstract Acid‐sulphate alteration commonly changes the physicochemical properties of volcanic conduits. Although several conduit pressurization models suggest hydrothermal sealing, little experimental evidence exists from conduit‐filling rocks on the development of such a seal. Here we show that acid‐sulphate alteration affects conduit‐filling lavas and tuffs differently, with implications for their role in sealing the conduit. In lavas, alteration creates fluid pathways and decreases rock stiffness by dissolving primary minerals. In contrast, in the inherently porous tuffs, alteration reduces fluid pathways and increases rock stiffness by precipitating secondary minerals. Compaction of tuffs under subsurface pressures together with such alteration‐related sealing can form low porosity and low permeability zones within the conduit. Such zones could promote fluid‐pressure build‐up and predispose the volcano to explosive eruptions. We discuss our results in the context of observed seismicity and ground deformation and suggest using our elastic properties data to constrain geophysical inversions of acid‐sulphate altered volcanic conduits. |
| format | Article |
| id | doaj-art-0b957fb7c30a4bbcb05976ad0a5f4f97 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-0b957fb7c30a4bbcb05976ad0a5f4f972025-08-20T03:30:53ZengWileyGeophysical Research Letters0094-82761944-80072021-10-014820n/an/a10.1029/2021GL095175The Role of Tuffs in Sealing Volcanic ConduitsShreya Kanakiya0Ludmila Adam1Michael C. Rowe2Jan M. Lindsay3Lionel Esteban4University of Auckland School of Environment Auckland New ZealandUniversity of Auckland School of Environment Auckland New ZealandUniversity of Auckland School of Environment Auckland New ZealandUniversity of Auckland School of Environment Auckland New ZealandCSIRO‐Energy Perth WA AustraliaAbstract Acid‐sulphate alteration commonly changes the physicochemical properties of volcanic conduits. Although several conduit pressurization models suggest hydrothermal sealing, little experimental evidence exists from conduit‐filling rocks on the development of such a seal. Here we show that acid‐sulphate alteration affects conduit‐filling lavas and tuffs differently, with implications for their role in sealing the conduit. In lavas, alteration creates fluid pathways and decreases rock stiffness by dissolving primary minerals. In contrast, in the inherently porous tuffs, alteration reduces fluid pathways and increases rock stiffness by precipitating secondary minerals. Compaction of tuffs under subsurface pressures together with such alteration‐related sealing can form low porosity and low permeability zones within the conduit. Such zones could promote fluid‐pressure build‐up and predispose the volcano to explosive eruptions. We discuss our results in the context of observed seismicity and ground deformation and suggest using our elastic properties data to constrain geophysical inversions of acid‐sulphate altered volcanic conduits.https://doi.org/10.1029/2021GL095175hydrothermal alterationdissolution and secondary mineral precipitationpetrophysical propertieselastic propertiesvolcanic conduitsWhakaari (White Island) |
| spellingShingle | Shreya Kanakiya Ludmila Adam Michael C. Rowe Jan M. Lindsay Lionel Esteban The Role of Tuffs in Sealing Volcanic Conduits Geophysical Research Letters hydrothermal alteration dissolution and secondary mineral precipitation petrophysical properties elastic properties volcanic conduits Whakaari (White Island) |
| title | The Role of Tuffs in Sealing Volcanic Conduits |
| title_full | The Role of Tuffs in Sealing Volcanic Conduits |
| title_fullStr | The Role of Tuffs in Sealing Volcanic Conduits |
| title_full_unstemmed | The Role of Tuffs in Sealing Volcanic Conduits |
| title_short | The Role of Tuffs in Sealing Volcanic Conduits |
| title_sort | role of tuffs in sealing volcanic conduits |
| topic | hydrothermal alteration dissolution and secondary mineral precipitation petrophysical properties elastic properties volcanic conduits Whakaari (White Island) |
| url | https://doi.org/10.1029/2021GL095175 |
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