• journal_title：American Mineralogist
• Contributor：F. Nestola ; D. Pasqual ; J.R. Smyth ; D. Novella ; L. Secco ; M.H. Manghnani ; A. Dal Negro
• Publisher：Mineralogical Society of America
• Date：2011-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2011.3829
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：96
• issue：11-12
• firstpage：1742
• section：Articles

Three natural olivines with Fo₈₀Fa₂₀, Fo₇₁Fa₂₉, and Fo₆₂Fa₃₈ compositions were investigated in situ at high pressure by single-crystal X-ray diffraction using a diamond-anvil cell up to ~8 GPa at room temperature. The bulk modulus, K_T0, and its first pressure derivative, K′, do not show any significant variation among the compositions investigated and, using the data on a further sample with Fo₉₂Fa₈ composition recently investigated in the same laboratory and using the same experimental technique, we obtain, for the first time, a single equation of state for the entire Fo₉₂Fa₈-Fo₆₂Fa₃₈ compositional range. The equation has the following coefficients: K_T0 = 124.7(9) GPa and K′ = 5.3(3) and can be used for thermodynamic calculations involving the most common mantle olivine compositions.