Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction
In: Contributions to Mineralogy and Petrology, vol 173, iss 7; (2018-07-01)
Online
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Zugriff:
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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Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction
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Autor/in / Beteiligte Person: | Wenk, Hans-Rudolf ; Voltolini, Marco ; Manga, Michael |
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Quelle: | Contributions to Mineralogy and Petrology, vol 173, iss 7; (2018-07-01) |
Veröffentlichung: | eScholarship, University of California, 2018 |
Medientyp: | unknown |
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