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American Mineralogist; January 2004; v. 89; no. 1; p. 185-188
© 2004 Mineralogical Society of America
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Equations of state of ZrSiO4 phases in the upper mantle

Shigeaki Ono1,*, Yoshinori Tange2, Ikuo Katayama2 and Takumi Kikegawa3

1 Institute for Frontier Research on Earth Evolution, Japan Marine Science & Technology Center, 2-15 Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
2 Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551, Japan
3 High Energy Acceleration Research Organization, Tsukuba 305-0801, Japan

Correspondence: * E-mail: sono{at}jamstec.go.jp

The compressibility of zircon and reidite (ZrSiO4) was investigated by powder X-ray diffraction (XRD) up to 20 GPa using a synchrotron radiation source. Reliable equations of state for zircon and reidite were obtained using a diamond anvil cell (DAC) coupled with yttrium-aluminum-garnet (YAG) laser-heating. Samples were heated with the laser at each pressure increment to relax deviatoric stress. XRD measurements were carried out at 300 K using an angle-dispersive technique. Data refinements yield third-order Birch-Murnaghan equations of state parameters: the bulk modulus K0 = 205(±8) GPa when the first pressure derivative of the bulk modulus, K'0, is fixed at 4 for zircon, K0 = 392(±9) when K'0 is fixed at 4 for reidite. The volume reduction of the phase transition from zircon to reidite is about 10%. The tentative phase boundary between zircon and reidite is located at about 10 GPa.




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