Abstract
The thermoelastic parameters of the CAS phase (CaAl4Si2O11) were examined by in situ high-pressure (up to 23.7 GPa) and high-temperature (up to 2,100 K) synchrotron X-ray diffraction, using a Kawai-type multi-anvil press. P–V data at room temperature fitted to a third-order Birch–Murnaghan equation of state (BM EOS) yielded: V 0,300 = 324.2 ± 0.2 Å3 and K 0,300 = 164 ± 6 GPa for K′ 0,300 = 6.2 ± 0.8. With K′ 0,300 fixed to 4.0, we obtained: V 0,300 = 324.0 ± 0.1 Å3 and K 0,300 = 180 ± 1 GPa. Fitting our P–V–T data with a modified high-temperature BM EOS, we obtained: V 0,300 = 324.2 ± 0.1 Å3, K 0,300 = 171 ± 5 GPa, K′ 0,300 = 5.1 ± 0.6 (∂K 0,T /∂T) P = −0.023 ± 0.006 GPa K−1, and α0,T = 3.09 ± 0.25 × 10−5 K−1. Using the equation of state parameters of the CAS phase determined in the present study, we calculated a density profile of a hypothetical continental crust that would contain ~10 vol% of CaAl4Si2O11. Because of the higher density compared with the coexisting minerals, the CAS phase is expected to be a plunging agent for continental crust subducted in the transition zone. On the other hand, because of the lower density compared with lower mantle minerals, the CAS phase is expected to remain buoyant in the lowermost part of the transition zone.
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Acknowledgments
The authors thank K. Funakoshi, Y. Higo, and T. Kunimoto for their helpful assistance in the experiments at BL04B1, at the synchrotron radiation facility, SPring-8 (Project 2010A1326). We are grateful for assistance of A. Yamada and H. Ohfuji in the preparation and analyses of starting materials. We acknowledge D. Gatta and M. Akaogi for valuable comments, which improved the manuscript, and C. McCammon for its editorial handling. This work was supported by the Global-COE program “Deep Earth Mineralogy”.
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Gréaux, S., Nishiyama, N., Kono, Y. et al. P–V–T equation of state of CaAl4Si2O11 CAS phase. Phys Chem Minerals 38, 581–590 (2011). https://doi.org/10.1007/s00269-011-0430-7
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DOI: https://doi.org/10.1007/s00269-011-0430-7