Details
Original language | English |
---|---|
Pages (from-to) | 1451-1469 |
Number of pages | 19 |
Journal | Journal of Geophysical Research: Planets |
Volume | 124 |
Issue number | 5 |
Early online date | 2 May 2019 |
Publication status | Published - 14 Jun 2019 |
Abstract
New viscosity experiments at superliquidus temperatures and during cooling at a rate of 10 K/hr have been performed at different shear rates on a synthetic pyroxenite melt. Results revealed that this melt is extremely fluid at temperature between 1646 and 1530 K and measured viscosities are between 2.2 and 7.8 Pa·s. Such very low viscosities allow the lava to flow in turbulent regime as confirmed by the high Reynolds numbers, which are always >2,000. As a consequence, very long distance could be covered by the lava flow. If we consider this studied composition as proxy for Mars lava flows coupled with very high effusion rates, our results might explain the presence of extraordinary large volcanic channels, as recently hypothesized for the Kasei Valles on Mars, even considering that the gravity is approximately one third that of Earth. Few literature data tracking viscosity during cooling are available, and they reported shear thinning effect on different compositions. Our experiments performed at 0.1 and 1 s−1 have shown complex variation in the apparent viscosity, confirming that nonequilibrium rheology represents a still unexplored field of investigation useful to better understand the real geological scenarios occurring in magmatic and volcanic systems.
Keywords
- crystallization, magma, Mars, melt, rheology, viscosity
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Agricultural and Biological Sciences(all)
- Forestry
- Earth and Planetary Sciences(all)
- Oceanography
- Agricultural and Biological Sciences(all)
- Aquatic Science
- Environmental Science(all)
- Ecology
- Environmental Science(all)
- Water Science and Technology
- Agricultural and Biological Sciences(all)
- Soil Science
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
- Earth and Planetary Sciences(all)
- Atmospheric Science
- Earth and Planetary Sciences(all)
- Earth and Planetary Sciences (miscellaneous)
- Earth and Planetary Sciences(all)
- Space and Planetary Science
- Earth and Planetary Sciences(all)
- Palaeontology
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Journal of Geophysical Research: Planets, Vol. 124, No. 5, 14.06.2019, p. 1451-1469.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Viscosity of Pyroxenite Melt and Its Evolution During Cooling
AU - Vetere, Francesco
AU - Murri, M.
AU - Alvaro, M.
AU - Domeneghetti, M. C.
AU - Rossi, S.
AU - Pisello, A.
AU - Perugini, Diego
AU - Holtz, Francois
N1 - Funding information: [ This research was funded by the European Research Council Consolidator Grant ERC-2013-COG No. 612776 (CHRONOS project) to D. Perugini and by the F.R.B. TESLA to F. Vetere. Alexander von Humboldt Foundation Senior Research Grant to F. Vetere is also acknowledged. M. A. and M. M. are supported by the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme (grant agreement 714936 for the project TRUE DEPTHS to M. Alvaro). M. C. D. has been supported by the PNRA 2016 Antartic Meteorites to Luigi Folco. Data of experiments are reported in Tables and, in Figures, and in the supporting information as Tables S1–S5 and Figures S1–S3. This research was funded by the European Research Council Consolidator Grant ERC?2013?COG No. 612776 (CHRONOS project) to D. Perugini and by the F.R.B. TESLA to F. Vetere. Alexander von Humboldt Foundation Senior Research Grant to F. Vetere is also acknowledged. M. A. and M. M. are supported by the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme (grant agreement 714936 for the project TRUE DEPTHS to M. Alvaro). M. C. D. has been supported by the PNRA 2016 Antartic Meteorites to Luigi Folco. Data of experiments are reported in Tables 1 and 2, in Figures 1–9, and in the supporting information as Tables S1–S5 and Figures S1–S3.
PY - 2019/6/14
Y1 - 2019/6/14
N2 - New viscosity experiments at superliquidus temperatures and during cooling at a rate of 10 K/hr have been performed at different shear rates on a synthetic pyroxenite melt. Results revealed that this melt is extremely fluid at temperature between 1646 and 1530 K and measured viscosities are between 2.2 and 7.8 Pa·s. Such very low viscosities allow the lava to flow in turbulent regime as confirmed by the high Reynolds numbers, which are always >2,000. As a consequence, very long distance could be covered by the lava flow. If we consider this studied composition as proxy for Mars lava flows coupled with very high effusion rates, our results might explain the presence of extraordinary large volcanic channels, as recently hypothesized for the Kasei Valles on Mars, even considering that the gravity is approximately one third that of Earth. Few literature data tracking viscosity during cooling are available, and they reported shear thinning effect on different compositions. Our experiments performed at 0.1 and 1 s−1 have shown complex variation in the apparent viscosity, confirming that nonequilibrium rheology represents a still unexplored field of investigation useful to better understand the real geological scenarios occurring in magmatic and volcanic systems.
AB - New viscosity experiments at superliquidus temperatures and during cooling at a rate of 10 K/hr have been performed at different shear rates on a synthetic pyroxenite melt. Results revealed that this melt is extremely fluid at temperature between 1646 and 1530 K and measured viscosities are between 2.2 and 7.8 Pa·s. Such very low viscosities allow the lava to flow in turbulent regime as confirmed by the high Reynolds numbers, which are always >2,000. As a consequence, very long distance could be covered by the lava flow. If we consider this studied composition as proxy for Mars lava flows coupled with very high effusion rates, our results might explain the presence of extraordinary large volcanic channels, as recently hypothesized for the Kasei Valles on Mars, even considering that the gravity is approximately one third that of Earth. Few literature data tracking viscosity during cooling are available, and they reported shear thinning effect on different compositions. Our experiments performed at 0.1 and 1 s−1 have shown complex variation in the apparent viscosity, confirming that nonequilibrium rheology represents a still unexplored field of investigation useful to better understand the real geological scenarios occurring in magmatic and volcanic systems.
KW - crystallization
KW - magma
KW - Mars
KW - melt
KW - rheology
KW - viscosity
UR - http://www.scopus.com/inward/record.url?scp=85066477213&partnerID=8YFLogxK
U2 - 10.15488/10184
DO - 10.15488/10184
M3 - Article
AN - SCOPUS:85066477213
VL - 124
SP - 1451
EP - 1469
JO - Journal of Geophysical Research: Planets
JF - Journal of Geophysical Research: Planets
SN - 2169-9097
IS - 5
ER -