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

Journal Article · · Contributions to Mineralogy and Petrology
 [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
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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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1561893
Journal Information:
Contributions to Mineralogy and Petrology, Journal Name: Contributions to Mineralogy and Petrology Journal Issue: 7 Vol. 173; ISSN 0010-7999
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
Crystal-preferred orientation
Microlite alignment
Obsidian
Strain estimates
Texture analysis