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Ab initio calculations of elastic constants of plagioclase feldspars

Pamela Kaercher, Burkhard Militzer and Hans-Rudolf Wenk
Ab initio calculations of elastic constants of plagioclase feldspars
American Mineralogist (November 2014) 99 (11-12): 2344-2352


Plagioclase feldspars comprise a large portion of the Earth's crust and are very anisotropic, making accurate knowledge of their elastic properties important for understanding the crust's anisotropic seismic signature. However, except for albite, existing elastic constants for plagioclase feldspars are derived from measurements that cannot resolve the triclinic symmetry. We calculate elastic constants for plagioclase end-members albite NaAlSi (sub 3) O (sub 8) and anorthite CaAl (sub 2) Si (sub 2) O (sub 8) and intermediate andesine/labradorite NaCaAl (sub 3) Si (sub 5) O (sub 16) using density functional theory to compare with and improve existing elastic constants and to study trends in elasticity with changing composition. We obtain elastic constants similar to measured elastic constants and find that anisotropy decreases with anorthite content.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 11-12
Title: Ab initio calculations of elastic constants of plagioclase feldspars
Affiliation: University of California, Berkeley, Department of Earth and Planetary Science, Berkeley, CA, United States
Pages: 2344-2352
Published: 201411
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 71
Accession Number: 2015-007391
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201504
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