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Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction

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Abstract

Clinopyroxene and plagioclase (andesine) microlites in an obsidian flow from Glass Mountain (NE California, USA) display strong alignment. Synchrotron X-ray diffraction, coupled with Rietveld analysis, was used to quantify crystallographic-preferred orientation (CPO). Clinopyroxene, with a rod-shaped morphology, shows a strong alignment of [001] in the flow direction and (010) aligned parallel to the inferred flow plane. Andesine, with a platy morphology, displays an alignment of (010) platelets in the flow plane. Some pole densities exceed 90 multiples of random distribution. Applying a model of rigid ellipsoidal inclusions in a viscous matrix, the local pure shear strains are between 2 and 3.

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Acknowledgements

HRW acknowledges support from NSF (EAR-1343908) and DOE (DE-FG02-05ER15637) and access to beamline 11-ID-C at the Advanced Photon Source (APS) of Argonne National Laboratory. MM is supported by NSF 1724469. We appreciate help from Yang Ren at beamline ID-11 ID-C of APS and Tim Teague for sample preparation. Part of this research was done during a research leave at the University of Trento/Mesiano and HRW is grateful to Luca Lutterotti for the hospitality and guidance in data analysis, and also for access to the SEM and help from Lorena Maines. The authors thank the editor, J. Donnelly-Nolan, and an anonymous reviewer for constructive comments and suggestions. Authors are listed in alphabetical order.

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  1. Department of Earth and Planetary Science, University of California, Berkeley, CA, 94720, USA

    Michael Manga & Hans-Rudolf Wenk

  2. Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    Marco Voltolini

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  1. Michael Manga
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Correspondence to Hans-Rudolf Wenk.

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Communicated by Timothy L. Grove.

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Manga, M., Voltolini, M. & Wenk, HR. Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction. Contrib Mineral Petrol 173, 58 (2018). https://doi.org/10.1007/s00410-018-1479-9

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