An expanded non-Arrhenian model for silicate melt viscosity: A treatment for metaluminous, peraluminous and peralkaline liquids

Giordano, Daniele; Mangiacapra, A.; Potužák, Marcel; Russell, James K.; Romano, Claudia; Dingwell, D. B.; Muro, Andréa Di

doi:10.1016/j.chemgeo.2006.01.007

Cited by 126 publications

(91 citation statements)

References 38 publications

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“…% of water, the Iricoumé rhyolite (sample A62a) has yielded viscosity values around one order of magnitude lower than those of Giordano et al (2008). The viscosity values shown by one metaluminous trachyte (sample A76a) is 0.5 order of magnitude lower than those obtained by Giordano et al (2006) for a trachytic tephra of the Campanian Ignimbrite, at the same temperature. Goto et al (2005) presented viscosity data for dry rhyolite melts, with similar composition and temperature, around 0.5 order of magnitude higher than those calculated for the Iricoumé rhyolite (sample A62a).…”

Section: Zircon and Apatite Saturation Temperaturesmentioning

confidence: 81%

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Paleoproterozoic (~1.88Ga) felsic volcanism of the Iricoumé Group in the Pitinga Mining District area, Amazonian Craton, Brazil: insights in ancient volcanic processes from field and petrologic data

Pierosan

Lima

Nardi

et al. 2011

An. Acad. Bras. Ciênc.

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The Iricoumé Group correspond to the most expressive Paleoproterozoic volcanism in the Guyana Shield, Amazonian craton. The volcanics are coeval with Mapuera granitoids, and belong to the Uatumã magmatism. They have U-Pb ages around 1880 Ma, and geochemical signatures of A-type magmas. Iricoumé volcanics consist of porphyritic trachyte to rhyolite, associated to crystal-rich ignimbrites and co-ignimbritic fall tuffs and surges. The amount and morphology of phenocrysts can be useful to distinguish lava (flow and dome) from hypabyssal units. The morphology of ignimbrite crystals allows the distinction between effusive units and ignimbrite, when pyroclasts are obliterated. Co-ignimbritic tuffs are massive, and some show stratifications that suggest deposition by current traction flow. Zircon and apatite saturation temperatures vary from 799 • C to 980 • C, are in agreement with most temperatures of A-type melts and can be interpreted as minimum liquidus temperature. The viscosities estimation for rhyolitic and trachytic compositions yield values close to experimentally determined melts, and show a typical exponential decay with water addition. The emplacement of Iricoumé volcanics and part of Mapuera granitoids was controlled by ring-faults in an intracratonic environment. A genesis related to the caldera complex setting can be assumed for the Iricoumé-Mapuera volcano-plutonic association in the Pitinga Mining District.

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Section: Zircon and Apatite Saturation Temperaturesmentioning

confidence: 81%

“…For this calculation, we assume that the bulk rock composition approximates to the original melt composition. The purpose of this calculation is to achieve approximated viscosity using estimated liquidus temperature, and compare with those measured from melt compositions (Goto et al 2005, Giordano et al 2006, 2008.…”

Section: Methodsmentioning

confidence: 99%

Paleoproterozoic (~1.88Ga) felsic volcanism of the Iricoumé Group in the Pitinga Mining District area, Amazonian Craton, Brazil: insights in ancient volcanic processes from field and petrologic data

Pierosan

Lima

Nardi

et al. 2011

An. Acad. Bras. Ciênc.

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“…Shaw 1972;Bottinga & Weill 1972) to non-Arrhenian models, considering magma composition and volatile effects (e.g. Baker 1996;Hess & Dingwell 1996;Russell et al 2002;Giordano & Dingwell 2003;Russell & Giordano 2005;Giordano et al 2006;Vetere et al 2006;Hui & Zhang 2007;Giordano et al 2008).…”

Section: Introductionmentioning

confidence: 99%

The role of viscosity in the emplacement of high-temperature acidic flows of Serra Geral Formation in Torres Syncline (Rio Grande do Sul State, Brazil)

Simões¹,

Rossetti²,

Lima³

et al. 2014

Braz. J. Geol.

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ABSTRACT:The acidic flows from Serra Geral Formation in Torres Syncline, Rio Grande do Sul, Brazil, are on the top of a volcanic sequence composed by a complex facies association of compound, simple and rubbly pahoehoe basic flows, acidic lava domes, and tabular acidic lava flows. The origin and emplacement conditions of the acidic volcanic rocks are discussed in this paper based on petrology, on calculated apatite saturation thermometry temperatures, and on estimated viscosity data. The liquidus temperatures for metaluminous rhyodacite to rhyolite samples are about 1,067.5 ± 25ºC in average. The viscosity (η) values vary from 10 5 to 10 6 Pas for anhydrous conditions, suggesting the emplacement of high-temperaturelow-viscosity lava flows and domes. The occurrence of acidic lava domes above simple pahoehoe flows as flow-banded vitrophyres was under low effusion rates, in spite of their high temperature and low viscosities, which are reflected in their small height. The emplacement of lava domes has continued until the eruption of rubbly pahoehoe flows and the geometry of these deposits rugged the relief. Presence of tabular acidic lava flows covering the landscape indicates that it was under high effusion rates conditions and such flows had well-insulated cooled surface crusts. The capacity to attain greater distances and overpass relief obstacles is explained not only by high effusion rates, but also by very low viscosities at the time of emplacement.

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“…The model is calibrated on ∼1800 viscosity measurements on dry and hydrous multi-component melts, and accounts for non-Arrhenian temperature dependence. Since a significant dataset used to calibrate the model refers to basaltic compositions (e.g., Giordano and Dingwell, 2003;Sato, 2005;Giordano et al, 2006;Ishibashi and Sato, 2006), this model is particularly suited for calculating magma viscosity of undersaturated basaltic products. The ability of the model of accurately predicting the viscosity of basaltic melts can be appreciated in Fig.…”

Section: The Modelsmentioning

confidence: 99%

Rheological control on the dynamics of explosive activity in the 2000 summit eruption of Mt. Etna

et al. 2010

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Abstract. In the period from January to June 2000 Mt. Etna exhibited an exceptional explosive activity characterized by a succession of 64 Strombolian and fire-fountaining episodes from the summit South-East Crater. Textural analysis of the eruptive products reveals that the magma associated with the Strombolian phases had a much larger crystal content (>55 vol%) with respect to the magma discharged during the firefountain phases (∼35 vol%). Rheological modelling shows that the crystal-rich magma falls in a region beyond a critical crystal content where small addition of solid particles causes an exponential increase of the effective magma viscosity. When implemented into the modeling of steady magma ascent dynamics (as assumed for the fire-fountain activity), a large crystal content as the one found for products of Strombolian eruption phases results in a one order of magnitude decrease of mass flow-rate, and in the onset of conditions where small heterogeneities in the solid fraction carried by the magma translate into highly unsteady eruption dynamics. We argue that crystallization on top of the magmatic column during the intermediate phases when magma was not discharged favoured conditions corresponding to Strombolian activity, with fire-fountain activity resuming after removal of the highly crystalline top. The numerical simulations also provide a consistent interpretation of the association between fire-fountain activity and emergence of lava flows from the crater flanks.

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An expanded non-Arrhenian model for silicate melt viscosity: A treatment for metaluminous, peraluminous and peralkaline liquids

Cited by 126 publications

References 38 publications

Paleoproterozoic (~1.88Ga) felsic volcanism of the Iricoumé Group in the Pitinga Mining District area, Amazonian Craton, Brazil: insights in ancient volcanic processes from field and petrologic data

Paleoproterozoic (~1.88Ga) felsic volcanism of the Iricoumé Group in the Pitinga Mining District area, Amazonian Craton, Brazil: insights in ancient volcanic processes from field and petrologic data

The role of viscosity in the emplacement of high-temperature acidic flows of Serra Geral Formation in Torres Syncline (Rio Grande do Sul State, Brazil)

Rheological control on the dynamics of explosive activity in the 2000 summit eruption of Mt. Etna

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