A proxy for magmatic foams: FOAMGLAS®, a closed-cell glass insulation

Ryan, Amy G.; Kolzenburg, Stephan; Vona, Alessandro; Heap, Michael; Russell, James K.; Badger, S.

doi:10.1016/j.nocx.2018.100001

Cited by 7 publications

(16 citation statements)

References 37 publications

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“…FOAMGLAS® (HLB 2400) is a high‐porosity, closed‐cell glass insulation manufactured by Owens Corning Corporation. Here we include a brief description of the material and readers are referred to Ryan et al () for full descriptions of its physical, thermal, and transport properties.…”

Section: Methodsmentioning

confidence: 99%

“…The solid component of FOAMGLAS® is crystal‐free soda lime glass, synthesized from recycled glass and other natural materials, including sand, dolomite, and lime (Ryan et al, ). We previously measured melt viscosities (η 0 ) by concentric cylinder and micropenetration viscometry, and used results to fit for the adjustable parameters in the Vogel‐Fulcher‐Tammann equation (log 10 η 0 = A + B /( T − C ), where T is the temperature in kelvin, A = −2.14, B = 4238.96, and C = 498.45; Ryan et al, ). We use our solution to model the temperature‐dependent melt viscosity of FOAMGLAS®.…”

Section: Methodsmentioning

confidence: 99%

“…Here we present a series of high‐temperature deformation experiments designed to explore the rheological behavior of bubbly silicate melts with a focus on processes that allow for gas retention or loss during flow. A key component of our study is a unique experimental material that allows to circumvent many of the issues presented by the use of natural materials: FOAMGLAS® is a crystal‐free soda lime glass foam that is texturally homogenous, bubble‐rich and, because all bubble walls are intact, impermeable (Ryan et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Strain‐Dependent Rheology of Silicate Melt Foams: Importance for Outgassing of Silicic Lavas

et al. 2019

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Outgassing of volcanic systems is a ubiquitous phenomenon. Yet the mechanisms facilitating gas escape from vesiculating magmas and lavas remain poorly understood. Pervasive outgassing is thought to depend on the efficient and abundant formation of permeable pathways. Here we present results from experiments designed to identify the conditions and mechanisms needed to form such permeable pathways. We use a foamed silicate melt (FOAMGLAS®) in our experiments as a proxy for natural vesicular melts. FOAMGLAS® cores are compressed under a range of temperatures and strain rates, and results are evaluated against the state of melt relaxation (parameterized using the Deborah number). We find that foam microstructure and rheological and outgassing behaviors evolve with strain and as a function of melt relaxation state. Relaxed melt foams harden during deformation but remain impermeable. As foams become less relaxed at higher strain rate and/or melt viscosity, they show complex responses to deformation (strain weakening and hardening) yet remain impermeable. Strain localization and formation of high‐permeability bands occur only in highly strained, unrelaxed foams. However, these bands are thin and oriented perpendicular to the principal stress, resulting in limited outgassing. Permeable pathways do not readily form in foams; rather, high‐porosity melts are “persistently impermeable.” Our results imply that vesicular silicic lavas may not outgas as efficiently as previously thought. Instead, sustained impermeability allows the lava to maintain low effective viscosities, and to flow extended distances. In addition, pore pressures may rise in deforming impermeable lavas, perhaps priming the lava for later explosive behavior.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strain‐Dependent Rheology of Silicate Melt Foams: Importance for Outgassing of Silicic Lavas

et al. 2019

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“…Early studies estimating the effect of void spaces within natural and simplified silicate melts [e.g. Bag− dassarov and Dingwell, 1992Lejeunne et al, 1999;Vona et al, 2016;Ryan et al, 2019] or synthetic analogues [e.g. Manga et al, 1998;Llewellin et al, 2002a, b;Llewellin and Manga, 2005] has been car− ried out by several authors.…”

Section: Models Of Bubble Suspension Rhe-ologymentioning

confidence: 99%

“…Lejeune and Richet, 1996;Bagdassarov and Pinkerton, 2004, Llewellin et al, 2002, Llewellin and Manga, 2005] also provided important attainments concerning the understanding of the effect of closed and opened voids on liquid viscosity [e.g. Lejeune et al, 1999;Bagdassarov and Dingwell, 1992;Quane and Russell, 2004;Llewellin et al, 2002a, b;Llewellin and Manga, 2005;Mader et al, 2013;Vona et al, 2016;Ryan et al, 2019]. A summary of recent formulations and works related to both crystal bearing and bubble bearing rheological studies is reported in Appendix A3.…”

Section: Models Of Bubble Suspension Rhe-ologymentioning

confidence: 99%

Advances in the rheology of natural multiphase silicate melts: Import for magma transport and lava flow emplacement

Giordano

2019

Annals of Geophysics

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A review of recent advances in the field of rheology of multicomponent silicate melts and multiphase silicate melt and multiphase silicate melt and analogue material suspensions is presented. is presented here. The advances include the development of new experimental de− vices and field and remote sensing methods for measuring the rheological properties of natural melts and magmas as well as new mod− elling strategies. These promising approaches combine laboratory experiments, theoretical models, numerical simulations and remote sens− ing data derived from ground, airborne and satellite−based tools. Each of these sub−disciplines has evolved rapidly in recent years and the growing range of complementary data appears now to provide an opportunity for the development of multi−disciplinary research. Ul− timately, these multidisciplinary initiatives seek to provide near−real−time forecasting of hazardous volcanic processes such as lava flow field evolution. The results and approaches described here focus on multiphase (i.e. melts, bubbles, crystals) rheology of natural systems and are pertinent to the effusive emplacement of lavas, dykes and sills, as well as, to the eruption dynamics attending explosive eruptions.

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