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- W1965158002 abstract "The elastic moduli of a synthetic single crystal of pure FeSiO 3 , orthoferrosilite, have been measured at 1 bar and 20°C by Brillouin spectroscopy. The moduli are (in megabars) c 11 = 1.98, c 22 = 1.36, c 33 = 1.75, c 44 = 0.59, c 55 = 0.58, c 66 = 0.49, c 12 = 0.84, c 13 = 0.72, c 23 = 0.55. A comparison of the pyroxene crystal structure with elasticity data shows that distortion of the tetrahedral chains parallel to c is related to c 33 Straight or extended chains increase c 33 , and highly kinked chains weaken the structure. However, the ferrosilite data show that beyond a certain degree of distortion the tetrahedral chains are essentially passive. Previous models of pyroxene elasticity have indicated that c 11 should be most sensitive to composition. This is supported by the current study and is reflected in the elasticity data via a positive linear correlation of c 11 with the size of the M1 octahedron, as measured by the average M1‐0 distance. The average longitudinal modulus 11 ((c 11 + c 22 + c 33 )/3) varies linearly with composition in the system orthoenstatite‐orthoferrosilite, whereas the average shear moduli ¯ 44 and ¯ 12 are constant for Fe contents of at least 20%. By comparison, data for the solid solution forsterite‐fayalite are consistent with a linear variation of modulus versus composition between the end‐members for all three average moduli. We suggest that this difference between orthopyroxene and olivine is due to a strong preference of Fe 2+ for the M2 octahedral site in pyroxene. The isotropic shear modulus μ is 30% lower for ferrosilite than enstatite. Despite a similar contrast in end‐member values of μ, the olivine data are consistent with a linear variation of μ between Fo 100 and Fa 100 . At high temperatures, Fe and Mg in orthopyroxene will be randomly distributed, and a linear variation of μ with molar content of Fe is expected. A comparison of laboratory elasticity data with observed mantle properties shows that V p , V s , and ρ of the upper mantle are satisfied by pure olivine. However, the data strongly suggest that without the coexistence of a garnet phase, no more than 10% orthopyroxene may be present in a model mantle assemblage. Ca‐clinopyroxene increases the upper limit on mantle garnet content but does not greatly affect constraints on the quantity of orthopyroxene in the upper mantle." @default.
- W1965158002 created "2016-06-24" @default.
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- W1965158002 date "1984-06-10" @default.
- W1965158002 modified "2023-10-13" @default.
- W1965158002 title "Elasticity of single‐crystal orthoferrosilite" @default.
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- W1965158002 doi "https://doi.org/10.1029/jb089ib06p04359" @default.
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