Outgassing and eruption of basaltic magmas: The effect of conduit geometry

Pioli, Laura; Azzopardi, B.J.; Bonadonna, Costanza; Brunet, Morgane; Kurokawa, Aika

doi:10.1130/g38787.1

Cited by 8 publications

(14 citation statements)

References 23 publications

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“…The localization of trains of ascending gas pockets may arise from in‐conduit convection: Pioli et al. (2017) found that focused bubble trains form as part of along‐strike convective cells in scaled analog laboratory experiments within a dyke‐like geometry.…”

Section: Discussionmentioning

confidence: 99%

The Birth of a Hawaiian Fissure Eruption

et al. 2021

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Section: Discussionmentioning

confidence: 99%

The Birth of a Hawaiian Fissure Eruption

et al. 2021

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“…Eruptive styles are controlled primarily by syn-eruptive magma ascent dynamics within volcanic conduit systems (e.g. Sparks 1978;Vergniolle and Jaupart 1990;Houghton et al 2004;Gonnermann and Manga 2013;Applegarth et al 2013;Pioli et al 2012Pioli et al , 2017Pering et al 2017) and pre-eruptive magmatic conditions of the reservoirs (e.g. Sparks and Huppert 1984;Anderson 1995;Corsaro and Pompilio 2004;Roeder et al 2006;Gurioli et al 2018).…”

Section: Contextmentioning

confidence: 99%

Basaltic dyke eruptions at Piton de La Fournaise: characterization of the eruptive products with implications for reservoir conditions, conduit processes and eruptive dynamics

Thivet

Gurioli

Muro

2020

Contrib Mineral Petrol

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Acknowledgments We thank A. J. L. Harris and G. Boudoire for the syn-eruptive sampling of the July 2015 products, J-L. Devidal and J-M. Hénot for their precious support in using the electronic microprobe and the SEM, and M. Benbakkar for the bulk rock analysis. We thank M.D. Higgins and L. Pioli with whom we had constructive discussions. This paper was greatly improved by the critical review of the anonymous reviewer and the editor. We thank the STRAP project funded by the Agence Nationale de la Recherche (ANR-14-CE03-0004-04). This research was financed by the French Government Laboratory of Excellence initiative no. ANR-10-LABX-0006, the Région Auvergne and the European Regional Development Fund. This is Laboratory of Excellence Clervolc contribution number 401.

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“…Indeed, we suggest that the local magmatic flux emitted by Vent B, between the 16th and 17th, was insufficient to drain continuous magmatic flow in the subsurface eruptive conduit contrary to Vent A. This also highlights the importance of the subsurface conduit geometry evolution that may control the magma path at shallow levels (Pioli et al, 2017). This local magmatic flux decrease allowed the magma to degas and crystallize near the fragmentation/explosion level within Vent B (Figures 12a and 12b), forming a low-permeable and rheological plug whose fragmentation generated the tachylite material.…”

Section: Evidences Of Plug Pressurization Triggering Relatively Energmentioning

confidence: 73%

“…The slight decrease of the volcanic tremor (Figures 2a and 2b) can be linked to the significant decrease of the activity in Vent B, while Vent A remained relatively active. We thus suggest that both subsurface eruptive conduit and scoria cone edifice geometry evolutions induced changes in the observed activity at the surface (Pioli et al, 2017). During the 17th, the activity increased in terms of volcanic tremor, lava flux (between 15 and 40 m 3 s -1 ; Figure 2d) and both bomb and ash emissions from Vent B (Figure 4) whereas Vent A remained active with typical Hawaiian-style activity (Figure 3).…”

Section: Eruptive-style Evolutionmentioning

confidence: 89%

Evidences of Plug Pressurization Enhancing Magma Fragmentation During the September 2016 Basaltic Eruption at Piton de la Fournaise (La Réunion Island, France)

Thivet

Gurioli

Muro

et al. 2020

Geochem Geophys Geosyst

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In September 2016, Piton de la Fournaise volcano, well known for its effusive and Hawaiian fountaining activity, produced, at the end of the eruption, an unusual phase of pulsating ash and bomb emission. Integration of geophysical data, with textural and petrological analysis of the samples, allowed us to constrain the main factors that controlled this sudden shift in activity, potentially dangerous for the tourist population that usually approach these “gentle” eruptive sites. Volcanic tremor, lava discharge rates, fountain heights, and SO2 emission changed rapidly during the eruption. Grain size and componentry of the tephra beds evolved from unimodal all along the sequence to bimodal on the last day of the activity, reflecting the contribution of both Hawaiian fountaining at the main vent (Vent A) and transient explosive activity at the second vent (Vent B). Hawaiian fountaining produced highly vesicular and almost microlite‐free tephra (golden pumice and fluidal scoria) while transient explosive activity emitted denser and crystal‐rich tephra (sideromelane and tachylite scoria) sometimes mingled with vesicular fragments. Permeability measurements on lapilli and bomb‐sized samples reveal that golden pumice and fluidal scoria were more gas‐permeable than the sideromelane and tachylite ones, while textural and chemical analyses of the ash support the hypothesis that these sideromelane and tachylite components were inherited from the subsurface crystallization of the initial golden pumice and fluidal scoria components. We thus suggest that Vent B accumulated a plug of degassed, cooled, and low‐permeable magma, which modulated overpressure pulses under the late input of ascending magma.

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Outgassing and eruption of basaltic magmas: The effect of conduit geometry

Cited by 8 publications

References 23 publications

The Birth of a Hawaiian Fissure Eruption

The Birth of a Hawaiian Fissure Eruption

Basaltic dyke eruptions at Piton de La Fournaise: characterization of the eruptive products with implications for reservoir conditions, conduit processes and eruptive dynamics

Evidences of Plug Pressurization Enhancing Magma Fragmentation During the September 2016 Basaltic Eruption at Piton de la Fournaise (La Réunion Island, France)

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