Abstract
In order to examine pressure–volume–temperature (P–V–T) relations for CaSiO3 perovskite (Ca-perovskite), high-temperature compression experiments with in situ X-ray diffraction were performed in a laser-heated diamond anvil cell (DAC) to 127 GPa and 2,300 K. We also employed an external heating system in the DAC in order to obtain P–V data at a moderate temperature of 700 K up to 113 GPa, which is the reference temperature for constructing an equation of state. The P–V data at 700 K were fitted to the second-order Birch–Murnaghan equation of state, yielding K 700,1bar = 207 ± 4 GPa and V 700,1bar = 46.5 ± 0.1 Å3. Thermal pressure terms were evaluated in the framework of the Mie–Grüneisen–Debye model, yielding γ 700,1bar = 2.7 ± 0.3, q 700,1bar = 1.2 ± 0.8, and θ 700,1bar = 1,300 ± 500 K. A thermodynamic thermal pressure model was also employed, yielding α700,1bar = 5.7 ± 0.5 × 10−5/K and (∂K/∂T) V = −0.010 ± 0.004 GPa/K. Computed densities along a lower mantle geotherm demonstrate that Ca-perovskite is denser than the surrounding lower mantle, suggesting that Ca-perovskite-rich rocks do not rise up through the lower mantle. One of such rocks might be a residue of partial melting of subducted mid-oceanic ridge basalt (MORB) at the base of the mantle. Since the partial melt is FeO-rich and therefore denser than the mantle, all the components of subducted MORB may not return to shallow levels.
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Acknowledgments
We thank J. Kato for his technical help in the experiments. J. Tuff kindly corrected the English of the manuscript. Two anonymous reviewers are acknowledged for their constructive and insightful comments and suggestions. This research was partially supported by the Grant-in-Aid for Scientific Research (S) to TK (#23224012) by the Ministry of Education, Culture, Sports, Science, and Technology, Japan. In situ X-ray diffraction experiments were conducted at the BL10XU beamline, SPring-8 (proposal no. 2011A0087 and 2011B0087).
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Noguchi, M., Komabayashi, T., Hirose, K. et al. High-temperature compression experiments of CaSiO3 perovskite to lowermost mantle conditions and its thermal equation of state. Phys Chem Minerals 40, 81–91 (2013). https://doi.org/10.1007/s00269-012-0549-1
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DOI: https://doi.org/10.1007/s00269-012-0549-1