Equation of state of pyrope-almandine solid solution measured using a diamond anvil cell and in situ synchrotron X-ray diffraction

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• 作者：Shu Huang^a ; Jiuhua Chen^a ; ^b ; ^{chenj@fiu.edu" class="auth_mail}
• 关键词：Pyrope ; Almandine ; Garnet ; Equation of state ; Diamond anvil cell
• 刊名：Physics of the Earth and Planetary Interiors
• 出版年：March, 2014
• 年：2014
• 卷：228
• 期：Complete
• 页码：88-91
• 全文大小：420 K

文摘

The pressure-volume relations of three synthetic garnet samples along pyrope-almandine (Py-Alm) join were measured at ambient temperature and high pressures up to 7, 21 and 19 GPa for Py₈₃Alm₁₇, Py₅₄Alm₄₆ and Py₃₀Alm₇₀, respectively. The obtained P-V data were fitted to the third order Birch-Murnaghan equation of state (EOS). The ambient cell volumes V₀ of the three samples were measured to be 1511(1), 1515(2), and 1526(1) 脜³ respectively. With fixed pressure derivative of the isothermal bulk modulus K鈥?at 4.3, isothermal bulk moduli K₀ of the three samples were determined to be 172(4), 174(2), and 183(2) GPa respectively. These results confirm that almandine content (iron substitution) increase the bulk modulus of the garnet join following a nearly ideal mixing model. The relation between bulk modulus and almandine mole fraction (n) in this garnet join is derived to be K₀ = 170 + 15 n. These data can be used to contribute to construction of compositional model of earth mantle.