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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6220
Title: In situ viscometry of primitive lunar magmas at high pressure and high temperature
Authors: Rai N.
Perrillat J.-P.
Mezouar M.
Colin A.
Petitgirard S.
van Westrenen W.
Published in: Frontiers in Earth Science
Abstract: Understanding the dynamics of the magmatic evolution of the interior of the Moon requires accurate knowledge of the viscosity (?) of lunar magmas at high pressure (P) and high temperature (T) conditions. Although the viscosities of terrestrial magmas are relatively well-documented, and their relation to magma composition well-studied, the viscosities of lunar titano-silicate melts are not well-known. Here, we present an experimentally measured viscosity dataset for three end member compositions, characterized by a wide range of titanium contents, at lunar-relevant pressure-temperature range of ?1.1–2.4 GPa and 1830–2090 K. In situ viscometry using the falling sphere technique shows that the viscosity of lunar melts varies between ?0.13 and 0.87 Pa-s depending on temperature, pressure and composition. Viscosity decreases with increasing temperature with activation energies for viscous flow of Ea = 201 kJ/mol and Ea = 106 kJ/mol for low-titanium (Ti) and high-Ti melts, respectively. Pressure is found to mildly increase the viscosity of these intermediate polymerized melts by a factor of ?1.5 between 1.1 and 2.4 GPa. Viscosities of low-Ti and high-Ti magmas at their respective melting temperatures are very close. However at identical P-T conditions (?1.3 GPa, ?1840 K) low-Ti magmas are about a factor of three more viscous than high-Ti magmas, reflecting structural effects of Si and Ti on melt viscosity. Measured viscosities differ significantly from empirical models based on measurements of the viscosity of terrestrial basalts, with largest deviations observed for the most Ti-rich and Si-poor composition. Viscosity coefficients for these primitive lunar melts are found to be lower than those of common terrestrial basalts, giving them a high mobility throughout the lunar mantle and onto the surface of the Moon despite their Fe and Ti-rich compositions. © 2019 Rai, Perrillat, Mezouar, Colin, Petitgirard and van Westrenen.
Citation: Frontiers in Earth Science (2019), 7(): -
URI: https://doi.org/10.3389/feart.2019.00094
http://repository.iitr.ac.in/handle/123456789/6220
Issue Date: 2019
Publisher: Frontiers Media S.A.
Keywords: High-pressure
Magmas
Moon
Synchrotron
Viscosity
ISSN: 22966463
Author Scopus IDs: 36137863700
8701203300
7003799217
35228667000
24466770400
6602710945
Author Affiliations: Rai, N., Department of Earth Sciences, Indian Institute of Technology, Roorkee, India
Perrillat, J.-P., Laboratoire de Géologie de Lyon, UMR5276, Université Lyon 1, Ens de Lyon, CNRS, Villeurbanne, France
Mezouar, M., European Synchrotron Radiation Facility, Grenoble, France
Colin, A., Géosciences Environnement Toulouse, UMR 5563, Toulouse, France
Petitgirard, S., Institute of Geochemistry and Petrology, Department of Earth Sciences, Eidgenössische Technische Hochschule Zürich, Zurich, Switzerland
van Westrenen, W., Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
Funding Details: This work was funded through a Netherlands Space Office/Netherlands Organisation for Scientific Research Planetary Science User Support Programme grant and Vici grant to WvW.
Corresponding Author: Perrillat, J.-P.; Laboratoire de Géologie de Lyon, UMR5276, Université Lyon 1, Ens de Lyon, CNRSFrance; email: jean-philippe.perrillat@univ-lyon1.fr
Appears in Collections:Journal Publications [ES]

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