Ab initio calculations of elastic constants of plagioclase feldspars
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...
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Published in | The American mineralogist Vol. 99; no. 11-12; pp. 2344 - 2352 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Washington
Mineralogical Society of America
01.11.2014
Walter de Gruyter GmbH |
Subjects | |
Online Access | Get full text |
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Summary: | 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 NaAlSi3O8 and anorthite CaAl2Si2O8 and intermediate andesine/labradorite NaCaAl3Si5O16 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. |
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ISSN: | 0003-004X 1945-3027 |
DOI: | 10.2138/am-2014-4796 |