A subgrain‐size piezometer calibrated for EBSD

Goddard, R. M. and Hansen, L. N. and Wallis, D. and Stipp, M. and Holyoke, C. W. and Kumamoto, K. M. and Kohlstedt, D. L. (2020) A subgrain‐size piezometer calibrated for EBSD. Geophysical Research Letters. ISSN 0094-8276 DOI https://doi.org/10.1029/2020GL090056

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Abstract

We calibrate a subgrain‐size piezometer using electron backscatter diffraction (EBSD) data collected from experimentally deformed samples of olivine and quartz. Systematic analyses of angular and spatial resolution test the suitability of each dataset for inclusion in calibration of the subgrain‐size piezometer. To identify subgrain boundaries, we consider a range of critical misorientation angles and conclude that a 1° threshold provides the optimal piezometric calibration. The mean line‐intercept length, equivalent to the subgrain‐size, is found to be inversely proportional to the von Mises equivalent stress for datasets both with and without the Holyoke and Kronenberg (2010) correction. These new piezometers provide stress estimates from EBSD analyses of polymineralic rocks without the need to discriminate between relict and recrystallised grains and therefore greatly increase the range of rocks that may be used to constrain geodynamic models.

Item Type: Article
Uncontrolled Keywords: 2020AREP; IA76
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
08 - Green Open Access
Journal or Publication Title: Geophysical Research Letters
Identification Number: https://doi.org/10.1029/2020GL090056
Depositing User: Sarah Humbert
Date Deposited: 23 Nov 2020 00:32
Last Modified: 10 May 2021 00:01
URI: http://eprints.esc.cam.ac.uk/id/eprint/4930

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