## Details

Originalsprache | Englisch |
---|---|

Aufsatznummer | 119902 |

Fachzeitschrift | Journal of Non-Crystalline Solids |

Jahrgang | 533 |

Frühes Online-Datum | 25 Jan. 2020 |

Publikationsstatus | Veröffentlicht - 1 Apr. 2020 |

## Abstract

The viscosity of a crystal-bearing shoshonite from Vulcanello (Aeolian Archipelago, Italy) was measured using the concentric cylinder method. Experiments were performed in the temperature interval from superliquidus (1573 K) to 1373 K with the aim to investigate the rheological response of the magma during variable cooling rate (i.e. 1000, 100 and 10 K/h) and shear rate (0.01, 0.1 and 1 s^{−1}). In one experiment, with a cooling rate of 10 K/h and shear rate of 1 s^{−1}, clinopyroxenes (ca. 11 vol.%) with hopper texture crystallized. One further experiment was performed for a longer time with a cooling rate of 100 K/h and shear rate of 1 s^{−1} to the final temperature of 1323 K. In this case, the final product showed skeletal crystals of pyroxenes (ca. 17 vol.%) and an apparent viscosity of 1.10 × 10^{4} Pa s, which was very close to the experiment performed at 10 K/h and shear rate of 1 s^{−1} to 1373 K (1.18 × 10^{4} Pa s). The comparison between experiments performed at cooling rate of 100 K/h, and finally quenched at to 1373 and 1323 K, respectively, showed that a temperature decrease of 50 K produces an increase in the apparent viscosity of ca. 1 log unit due to the transition from crystal-free to crystal-bearing melts. This study provides new data on apparent viscosity variation as cooling and shear rates vary in a crystallizing magmatic system. Results show that, on average, the viscosity of a shoshonitic system can increase by about two orders of magnitude due to temperature decrease from 1573 to 1373 K and the incipient crystallization occurring at the lowest temperatures. Finally, the results confirm that crystal nucleation and growth kinetics, as well as magma viscosity, are controlled by the dynamic state of the system.

## ASJC Scopus Sachgebiete

- Werkstoffwissenschaften (insg.)
**Elektronische, optische und magnetische Materialien**- Werkstoffwissenschaften (insg.)
**Keramische und Verbundwerkstoffe**- Physik und Astronomie (insg.)
**Physik der kondensierten Materie**- Werkstoffwissenschaften (insg.)
**Werkstoffchemie**

## Zitieren

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**Viscosity behaviour of silicate melts during cooling under variable shear rates.**/ Vetere, Francesco; Mazzeo, Andrea; Perugini, Diego et al.

in: Journal of Non-Crystalline Solids, Jahrgang 533, 119902, 01.04.2020.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

*Journal of Non-Crystalline Solids*, Jg. 533, 119902. https://doi.org/10.1016/j.jnoncrysol.2020.119902

*Journal of Non-Crystalline Solids*,

*533*, Artikel 119902. https://doi.org/10.1016/j.jnoncrysol.2020.119902

}

TY - JOUR

T1 - Viscosity behaviour of silicate melts during cooling under variable shear rates

AU - Vetere, Francesco

AU - Mazzeo, Andrea

AU - Perugini, Diego

AU - Holtz, Francois

N1 - Funding Information: This research was funded by the Alexander von Humboldt foundation senior research grant to F. Vetere and by European Research Council Consolidator Grant ERC-2013-COG No. 612776 (CHRONOS project) to D. Perugini.

PY - 2020/4/1

Y1 - 2020/4/1

N2 - The viscosity of a crystal-bearing shoshonite from Vulcanello (Aeolian Archipelago, Italy) was measured using the concentric cylinder method. Experiments were performed in the temperature interval from superliquidus (1573 K) to 1373 K with the aim to investigate the rheological response of the magma during variable cooling rate (i.e. 1000, 100 and 10 K/h) and shear rate (0.01, 0.1 and 1 s−1). In one experiment, with a cooling rate of 10 K/h and shear rate of 1 s−1, clinopyroxenes (ca. 11 vol.%) with hopper texture crystallized. One further experiment was performed for a longer time with a cooling rate of 100 K/h and shear rate of 1 s−1 to the final temperature of 1323 K. In this case, the final product showed skeletal crystals of pyroxenes (ca. 17 vol.%) and an apparent viscosity of 1.10 × 104 Pa s, which was very close to the experiment performed at 10 K/h and shear rate of 1 s−1 to 1373 K (1.18 × 104 Pa s). The comparison between experiments performed at cooling rate of 100 K/h, and finally quenched at to 1373 and 1323 K, respectively, showed that a temperature decrease of 50 K produces an increase in the apparent viscosity of ca. 1 log unit due to the transition from crystal-free to crystal-bearing melts. This study provides new data on apparent viscosity variation as cooling and shear rates vary in a crystallizing magmatic system. Results show that, on average, the viscosity of a shoshonitic system can increase by about two orders of magnitude due to temperature decrease from 1573 to 1373 K and the incipient crystallization occurring at the lowest temperatures. Finally, the results confirm that crystal nucleation and growth kinetics, as well as magma viscosity, are controlled by the dynamic state of the system.

AB - The viscosity of a crystal-bearing shoshonite from Vulcanello (Aeolian Archipelago, Italy) was measured using the concentric cylinder method. Experiments were performed in the temperature interval from superliquidus (1573 K) to 1373 K with the aim to investigate the rheological response of the magma during variable cooling rate (i.e. 1000, 100 and 10 K/h) and shear rate (0.01, 0.1 and 1 s−1). In one experiment, with a cooling rate of 10 K/h and shear rate of 1 s−1, clinopyroxenes (ca. 11 vol.%) with hopper texture crystallized. One further experiment was performed for a longer time with a cooling rate of 100 K/h and shear rate of 1 s−1 to the final temperature of 1323 K. In this case, the final product showed skeletal crystals of pyroxenes (ca. 17 vol.%) and an apparent viscosity of 1.10 × 104 Pa s, which was very close to the experiment performed at 10 K/h and shear rate of 1 s−1 to 1373 K (1.18 × 104 Pa s). The comparison between experiments performed at cooling rate of 100 K/h, and finally quenched at to 1373 and 1323 K, respectively, showed that a temperature decrease of 50 K produces an increase in the apparent viscosity of ca. 1 log unit due to the transition from crystal-free to crystal-bearing melts. This study provides new data on apparent viscosity variation as cooling and shear rates vary in a crystallizing magmatic system. Results show that, on average, the viscosity of a shoshonitic system can increase by about two orders of magnitude due to temperature decrease from 1573 to 1373 K and the incipient crystallization occurring at the lowest temperatures. Finally, the results confirm that crystal nucleation and growth kinetics, as well as magma viscosity, are controlled by the dynamic state of the system.

KW - Cooling rates

KW - Magma

KW - Melt

KW - Shear rate

KW - Viscosity

UR - http://www.scopus.com/inward/record.url?scp=85078199502&partnerID=8YFLogxK

U2 - 10.1016/j.jnoncrysol.2020.119902

DO - 10.1016/j.jnoncrysol.2020.119902

M3 - Article

AN - SCOPUS:85078199502

VL - 533

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

M1 - 119902

ER -