Tracking the permeable porous network during strain-dependent magmatic flow

Kendrick, Jackie E.; Lavallée, Yan; Hess, Kai‐Uwe; Heap, Michael; Gaunt, Elizabeth; Meredith, P. G.; Dingwell, Donald B.

doi:10.1016/j.jvolgeores.2013.05.012

Cited by 71 publications

(81 citation statements)

References 58 publications

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“…WDA on the material used for sintering confirmed that the interstitial glass was rhyolite (Table 2), and, using the model of Giordano et al (2008) we found the glass transition temperature (T g ) of 748 • C, in keeping with previous calorimetry measurements on dome collapse samples from Volcán de Colima that have shown that the "dry" rhyolitic interstitial glass has a T g of 746-751 • C (Kendrick et al, 2013). Prior to sintering the granular material, we measured the average porosity of the unconsolidated samples in crucibles to 0.41 (Table 3), equating approximately to the predicted maximum loose packing of particles (for a discussion see Torquato and Stillinger, 2002).…”

Section: Sintered Pyroclastic Materialssupporting

confidence: 87%

“…Hornblende was present in the 1913 magmas, but not in subsequent eruptions, and olivine exists as xenocrysts. The lavas generally contain ∼30 vol.% phenocrysts, 25-50 vol.% microlites and 14-45 vol.% "dry" rhyolitic glass (Reubi and Blundy, 2008;Savov et al, 2008;Lavallée et al, 2012;Kendrick et al, 2013) with a bimodal porosity distribution peaking at 12 and 26% . Geothermometry of pyroxenes suggests relatively deep magma storage at temperatures of 960-1020 • C (Savov et al, 2008), while melt inclusions verify this, indicating trapping conditions of 10-150 MPa and 959-1015 • C (Reubi et al, 2013).…”

Section: Historic Activity At Volcán De Colimamentioning

confidence: 99%

“…We then chose our experimental temperature based on the conduit temperature estimate of >940 • C (Reubi et al, 2013), rheological work on the dome lavas and calorimetric measurements on the rhyolitic interstitial glass that show the T g is 746-751 • C (at a cooling rate of 10 • C/minute; Kendrick et al, 2013). The samples were then placed into a preheated Carbolite 1400 furnace to sinter at a target temperature of either 940 or 980 • C for 3, 72, 120, or 168 h and then cooled at 4 • C per minute to room temperature (to minimize differential cooling that could cause damage to the sample).…”

Section: Sintering Pyroclastic Materials To Reconstruct Tuffisitesmentioning

confidence: 99%

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Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions

et al. 2016

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Tuffisites are veins of variably sintered, pyroclastic particles that form in conduits and lava domes as a result of localized fragmentation events during gas-and-ash explosions. Those observed in-situ on the active 2012 lava dome of Volcán de Colima range from voids with intra-clasts showing little movement and interpreted to be failure-nuclei, to sub-parallel lenses of sintered granular aggregate interpreted as fragmentation horizons, through to infilled fractures with evidence of viscous remobilization. All tuffisites show evidence of sintering. Further examination of the complex fracture-and-channel patterns reveals viscous backfill by surrounding magma, suggesting that lava fragmentation was followed by stress relaxation and continued viscous deformation as the tuffisites formed. The natural tuffisites are more permeable than the host andesite, and have a wide range of porosity and permeability compared to a narrower window for the host rock, and gaging from their significant distribution across the dome, we posit that the tuffisite veins may act as important outgassing pathways. To investigate tuffisite formation we crushed and sieved andesite from the lava dome and sintered it at magmatic temperatures for different times. We then assessed the healing and sealing ability by measuring porosity and permeability, showing that sintering reduces both over time. During sintering the porosity-permeability reduction occurs due to the formation of viscous necks between adjacent grains, a process described by the neck-formation model of Frenkel (1945). This process leads the granular starting material to a porosity-permeability regime anticipated for effusive lavas, and which describes the natural host lava as well as the most impervious of natural tuffisites. This suggests that tuffisite formation at Volcán de Colima constructed a permeable network that enabled gas to bleed passively from the magma. We postulate that this progressively reduced the lava dome's ability to seal and build pressure that drives explosions. Indeed, the time interval between explosions during 2007-2011 gradually increased before the onset of a period of quiescence starting in June 2011. We suggest that the permeability evolution during tuffisite formation has important consequences for modeling of gas-and-ash explosions, common at dome-forming volcanoes.

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Section: Sintered Pyroclastic Materialssupporting

confidence: 87%

Section: Historic Activity At Volcán De Colimamentioning

confidence: 99%

Section: Sintering Pyroclastic Materials To Reconstruct Tuffisitesmentioning

confidence: 99%

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Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions

et al. 2016

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“…3D imaging via conventional and synchrotron-based X-ray computed microtomography as well as neutron computed tomography offers the ability to image and quantify rock textures directly in 3D in unprecedented detail and references therein, Lavallée et al 2013, Arzilli et al 2016. Through 3D textural investigations we are able to view structures that are the result of strain localization [Wright and Wimberg 2009, Shields et al 2014, deformation [Okumura et al 2010;Caricchi et al 2011, Ashwell et al 2015, crystal aggregation and crystal fragmentation [Pamukcu et al 2012], convection , Carey et al 2013] and development of permeability [Bai et al 2010, Degruyter et al 2010b, Bai et al 2011, Kendrick et al 2013, Ashwell et al 2015 in magma, which can be related to experiments, and which in the near future could feed into experimental and numerical modeling. Finally, information on fragmentation mechanisms (the terms "phreatic", "hydrothermal", and "hydromagmatic" are cause of great amount of discussion and debate about their meaning and use) can, in part, be assessed from particle morphology [Dellino et al 2012, Jordan et al 2014, Liu et al 2015b, while TGSD provide information on fragmentation efficiency [Kueppers et al 2006, Rust and Cashman 2011, Costa et al 2016.…”

Section: From Magma Ascentmentioning

confidence: 99%

“…For example, transition from periodic explosions to effusive activity may occur when sufficient permeable outgassing develops, reducing pressurization within the conduit , Kozono and Koyaguchi 2009, Nguyen et al 2014, Spina et al 2016a. Viscous heating near conduit margins [Costa et al 2007a], and frictional heating along faults [Kendrick et al 2014a, b], can locally change effective viscosity , crystallization, volatile exsolution , kinetics and gas loss [ Kendrick et al 2013, which control magma flow cyclicity in lava dome eruptions [Lavallée et al 2012], thus possibly resulting in transient changes in the flow regime. These complex relationships and the time scales at which the processes occur deserve further studies to improve our knowledge of the unsteady dynamic of magma flow within the volcanic conduit.…”

Section: Unsteadinessmentioning

confidence: 99%

From magma ascent to ash generation: investigating volcanic conduit processes by integrating experiments, numerical modeling, and observations

Polacci

Vitturi²,

Arzilli

et al. 2017

Annals of Geophysics

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Microstructural controls on the physical and mechanical properties of edifice‐forming andesites at Volcán de Colima, Mexico

et al. 2014

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The reliable assessment of volcanic unrest must rest on an understanding of the rocks that form the edifice. It is their microstructure that dictates their physical properties and mechanical behavior and thus the response of the edifice to stress perturbations during unrest. We evaluate the interplay between microstructure and rock properties for a suite of edifice-forming rocks from Volcán de Colima (Mexico). Microstructural analyses expose (1) a pervasive, isotropic microcrack network, (2) a high, subspherical vesicle density, and (3) a wide vesicle size distribution. This complex microstructure severely impacts their physical and mechanical properties. In detail, porosities are high and range from 8 to 29%. As a consequence, elastic wave velocities, Youngs moduli, and uniaxial compressive strengths are low, and permeabilities are high. All of the rock properties demonstrate a wide range. For example, strength decreases by a factor of 8 and permeability increases by 4 orders of magnitude over the porosity range. Below a porosity of 11-14%, the permeability-porosity trend follows a power law with a much higher exponent. Microstructurally, this represents a critical vesicle content that efficiently connects the microcrack population and permits a much more direct path through the sample, rather than restricting flow to long and tortuous microcracks. Values of tortuosity inferred from the Kozeny-Carman permeability model support this hypothesis. However, we find that the complex microstructure precludes a complete description of their mechanical behavior through micromechanical modeling. We urge that the findings of this study be considered in volcanic hazard assessments at andesitic stratovolcanoes.

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Tracking the permeable porous network during strain-dependent magmatic flow

Cited by 71 publications

References 58 publications

Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions

Blowing Off Steam: Tuffisite Formation As a Regulator for Lava Dome Eruptions

From magma ascent to ash generation: investigating volcanic conduit processes by integrating experiments, numerical modeling, and observations

Microstructural controls on the physical and mechanical properties of edifice‐forming andesites at Volcán de Colima, Mexico

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