Details
| Original language | English |
|---|---|
| Title of host publication | Dynamic Magma Evolution |
| Publisher | Wiley-Blackwell |
| Pages | 153-167 |
| Number of pages | 15 |
| ISBN (electronic) | 9781119521143 |
| ISBN (print) | 9781119521136 |
| Publication status | Published - 1 Oct 2020 |
Publication series
| Name | Geophysical Monograph Series |
|---|---|
| Publisher | Wiley-Blackwell Publishing Ltd |
| ISSN (Print) | 0065-8448 |
Abstract
High-temperature experiments were performed in order to shed new light on the shear-rate controls on magma viscosity. We compare viscosity data from three different compositions: an andesite from the Calbuco volcano, a basalt from the Etna 122 BCE Plinian eruption and a synthetic pyroxenite with a composition similar to the Canadian Theo’s Flow. In addition to the determination of melt viscosity (at 1545-1715 K), we performed viscosity determinations at subliquidus conditions in partially crystallized materials, under controlled shear rates of 0.1 and 1 s-1 and at temperatures of 1483, 1493, and 1503 K for the Calbuco andesite, Etna basalt, and synthetic pyroxenite, respectively. The two different shear rates allow us to retrieve information about shear-rate influences on viscosity of partly crystallized systems. A decrease in viscosity is observed with increase in shear rate. This behavior is known in the literature as the “shear thinning effect.” Our data show that changes of shear rates from 0.1 to 1 s-1 may cause a viscosity difference of 0.5 to one order of magnitude. This effect should be taken into account when considering magmatic processes occurring in volcanic conduits. The rheological properties of partly crystallized systems could drastically change depending on the dynamics of the magmatic system.
Keywords
- Calbuco volcano, Magmatic system, Partly crystallized systems, Rheological behavior, Silicate melts, Variable shear rate, Viscosity
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
Cite this
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Dynamic Magma Evolution. Wiley-Blackwell, 2020. p. 153-167 (Geophysical Monograph Series).
Research output: Chapter in book/report/conference proceeding › Contribution to book/anthology › Research › peer review
}
TY - CHAP
T1 - Rheological Behavior of Partly Crystallized Silicate Melts Under Variable Shear Rate
AU - Vetere, Francesco
AU - Holtz, François
N1 - Publisher Copyright: © 2021 American Geophysical Union.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - High-temperature experiments were performed in order to shed new light on the shear-rate controls on magma viscosity. We compare viscosity data from three different compositions: an andesite from the Calbuco volcano, a basalt from the Etna 122 BCE Plinian eruption and a synthetic pyroxenite with a composition similar to the Canadian Theo’s Flow. In addition to the determination of melt viscosity (at 1545-1715 K), we performed viscosity determinations at subliquidus conditions in partially crystallized materials, under controlled shear rates of 0.1 and 1 s-1 and at temperatures of 1483, 1493, and 1503 K for the Calbuco andesite, Etna basalt, and synthetic pyroxenite, respectively. The two different shear rates allow us to retrieve information about shear-rate influences on viscosity of partly crystallized systems. A decrease in viscosity is observed with increase in shear rate. This behavior is known in the literature as the “shear thinning effect.” Our data show that changes of shear rates from 0.1 to 1 s-1 may cause a viscosity difference of 0.5 to one order of magnitude. This effect should be taken into account when considering magmatic processes occurring in volcanic conduits. The rheological properties of partly crystallized systems could drastically change depending on the dynamics of the magmatic system.
AB - High-temperature experiments were performed in order to shed new light on the shear-rate controls on magma viscosity. We compare viscosity data from three different compositions: an andesite from the Calbuco volcano, a basalt from the Etna 122 BCE Plinian eruption and a synthetic pyroxenite with a composition similar to the Canadian Theo’s Flow. In addition to the determination of melt viscosity (at 1545-1715 K), we performed viscosity determinations at subliquidus conditions in partially crystallized materials, under controlled shear rates of 0.1 and 1 s-1 and at temperatures of 1483, 1493, and 1503 K for the Calbuco andesite, Etna basalt, and synthetic pyroxenite, respectively. The two different shear rates allow us to retrieve information about shear-rate influences on viscosity of partly crystallized systems. A decrease in viscosity is observed with increase in shear rate. This behavior is known in the literature as the “shear thinning effect.” Our data show that changes of shear rates from 0.1 to 1 s-1 may cause a viscosity difference of 0.5 to one order of magnitude. This effect should be taken into account when considering magmatic processes occurring in volcanic conduits. The rheological properties of partly crystallized systems could drastically change depending on the dynamics of the magmatic system.
KW - Calbuco volcano
KW - Magmatic system
KW - Partly crystallized systems
KW - Rheological behavior
KW - Silicate melts
KW - Variable shear rate
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=85134942939&partnerID=8YFLogxK
U2 - 10.1002/9781119521143.ch7
DO - 10.1002/9781119521143.ch7
M3 - Contribution to book/anthology
AN - SCOPUS:85106160871
SN - 9781119521136
T3 - Geophysical Monograph Series
SP - 153
EP - 167
BT - Dynamic Magma Evolution
PB - Wiley-Blackwell
ER -