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

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.

Authors:
 [1];  [2]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science
  2. Univ. of California, Berkeley, CA (United States). Earth and Environmental Sciences Area
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1561893
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Contributions to Mineralogy and Petrology
Additional Journal Information:
Journal Volume: 173; Journal Issue: 7; Journal ID: ISSN 0010-7999
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Obsidian; Microlite alignment; Texture analysis; Crystal-preferred orientation; Strain estimates

Citation Formats

Manga, Michael, Voltolini, Marco, and Wenk, Hans-Rudolf. Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction. United States: N. p., 2018. Web. doi:10.1007/s00410-018-1479-9.
Manga, Michael, Voltolini, Marco, & Wenk, Hans-Rudolf. Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction. United States. doi:10.1007/s00410-018-1479-9.
Manga, Michael, Voltolini, Marco, and Wenk, Hans-Rudolf. Tue . "Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction". United States. doi:10.1007/s00410-018-1479-9. https://www.osti.gov/servlets/purl/1561893.
@article{osti_1561893,
title = {Microlite orientation in obsidian flow measured by synchrotron X-ray diffraction},
author = {Manga, Michael and Voltolini, Marco and Wenk, Hans-Rudolf},
abstractNote = {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.},
doi = {10.1007/s00410-018-1479-9},
journal = {Contributions to Mineralogy and Petrology},
number = 7,
volume = 173,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:
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