Viscosity of anhydrous and hydrous peridotite melts

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1016/j.chemgeo.2023.121440. This is version 1 of this Preprint.

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Authors

Danilo Di Genova, Dmitry Bondar, Alessio Zandonà, Pedro Valdivia, Raschid Al-Mukadam, Hongzhan Fei, Anthony C. Withers, Tiziana Boffa Ballaran, Alexander Kurnosov, Catherine McCammon, Joachim Deubener, Tomoo Katsura

Abstract

The melt viscosity (η) of anhydrous and hydrous peridotite was investigated using a multipronged approach combining micropenetration viscometry, conventional DSC, flash DSC and Brillouin spectroscopy. Raman spectroscopy measurements were used to verify the absence of crystallization and/or degassing during high-temperature measurements of these extremely reactive glasses and melts, ensuring that the data corresponded to the crystal-free melt viscosity. Based on the experimental data, an accurate description of the viscosity of peridotite melts over thirteen orders of magnitude (from Tg to η ≈ 10−1 Pa s) is provided in a broad range of compositions and oxidation states. Since empirical models predict viscosities that can significantly deviate from measured data to varying degrees, a new model was developed for the temperature- and H2O-dependent viscosity of peridotite melts (up to 12 mol% H2O content).

DOI

https://doi.org/10.31223/X5GM2Q

Subjects

Physical Sciences and Mathematics

Keywords

peridotite melt, viscosity, glass transition, calorimetry, Brillouin spectroscopy

Dates

Published: 2023-03-24 15:36

Last Updated: 2023-03-24 22:36

License

CC-BY Attribution-NonCommercial 4.0 International