التفاصيل البيبلوغرافية
| العنوان: |
Rheological change and degassing during a trachytic Vulcanian eruption at Kilian Volcano, Chaîne des Puys, France |
| المؤلفون: |
Colombier, Mathieu, Shea, Thomas, Burgisser, Alain, Druitt, Timothy H., Gurioli, Lucia, Müller, Dirk, Cáceres, Francisco, Hess, Kai-Uwe, Boivin, Pierre, Miallier, Didier, Dingwell, Donald B. |
| المصدر: |
http://lobid.org/resources/99370677087806441#!, 82(12):78. |
| سنة النشر: |
2020 |
| المجموعة: |
Publisso (ZB MED-Publikationsportal Lebenswissenschaften) |
| مصطلحات موضوعية: |
Trachytic magma, Vulcanian eruption, Degassing, Effusive-explosive transitions, Cristobalite, Magma Viscosity, Crystallization, Research Article, Nanolites |
| الوصف: |
AbstractMagma ascent during silicic dome-forming eruptions is characterized by significant changes in magma viscosity, permeability, and gas overpressure in the conduit. These changes depend on a set of parameters such as ascent rate, outgassing and crystallization efficiency, and magma viscosity, which in turn may influence the prevailing conditions for effusive versus explosive activity. Here, we combine chemical and textural analyses of tephra with viscosity models to provide a better understanding of the effusive-explosive transitions during Vulcanian phases of the 9.4 ka eruption of Kilian Volcano, Chaîne des Puys, France. Our results suggest that effusive activity at the onset of Vulcanian episodes at Kilian Volcano was promoted by (i) rapid ascent of initially crystal-poor and volatile-rich trachytic magma, (ii) a substantial bulk and melt viscosity increase driven by extensive volatile loss and crystallization, and (iii) efficient degassing/outgassing in a crystal-rich magma at shallow depths. Trachytic magma repeatedly replenished the upper conduit, and variations in the amount of decompression and cooling caused vertical textural stratification, leading to variable degrees of crystallization and outgassing. Outgassing promoted effusive dome growth and occurred via gas percolation through large interconnected vesicles, fractures, and tuffisite veins, fostering the formation of cristobalite in the carapace and talus regions. Build-up of overpressure was likely caused by closing of pore space (bubbles and fractures) in the dome through a combination of pore collapse, cristobalite formation, sintering in tuffisite veins, and limited pre-fragmentation coalescence in the dome or underlying hot vesicular magma. Sealing of the carapace may have caused a transition from open- to closed- system degassing and to renewed explosive activity. We generalize our findings to propose that the broad spectrum of eruptive styles for trachytic magmas may be inherited from a ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| Relation: |
https://repository.publisso.de/resource/frl:6469478; https://doi.org/10.1007/s00445-020-01420-5 |
| DOI: |
10.1007/s00445-020-01420-5 |
| الاتاحة: |
https://repository.publisso.de/resource/frl:6469478
https://doi.org/10.1007/s00445-020-01420-5 |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ |
| رقم الانضمام: |
edsbas.F1AE9E2 |
| قاعدة البيانات: |
BASE |