Abstract
Stabilities of hexagonal new aluminous (NAL) phase and Ca-ferrite-type (CF) phase were investigated on the join NaAlSiO4-MgAl2O4 in a pressure range from 23 to 58 GPa at approximately constant temperature of 1,850 K, on the basis of in situ synchrotron X-ray diffraction measurements in a laser-heated diamond-anvil cell. The results show that NAL is formed as a single phase up to 34 GPa, NAL + CF between 34 and 43 GPa, and only CF at higher pressures in 40%NaAlSiO4-60%MgAl2O4 bulk composition. On the other hand, both NAL and CF coexist below 38 and 36 GPa, and only CF was obtained at higher pressures in 60%NaAlSiO4-40%MgAl2O4 and 20%NaAlSiO4-80%MgAl2O4 composition, respectively. These results indicate that NAL appears only up to 46 GPa at 1,850 K, and CF forms continuous solid solution at higher pressures on the join NaAlSiO4-MgAl2O4. NAL has limited stability in subducted mid-oceanic ridge basalt crust in the Earth’s lower mantle and undergoes a phase transition to CF in deeper levels.
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References
Fei Y, Ricolleau A, Frank M, Mibe K, Shen G, Prakapenka V (2007) Toward an internally consist pressure scale. Proc Natl Acad Sci USA 104:9182–9186
Funamori N, Jeanloz R, Miyajima N, Fujino K (2000) Mineral assemblages of basalt in the lower mantle. J Geophys Res 105:26037–26043. doi:10.1029/2000JB900252
Guignot N, Andrault D (2004) Equations of state of Na-K-Al host phase and implications for MORB density in the lower mantle. Phys Earth Planet Inter 143–144:107–128
Hammersley AP (1998) Fit2d: V9.129 reference manual v3.1. Inter Rep ESRF98HA01. ESRF, Grenoble, France
Hirose K, Fei Y (2002) Subsolidus and melting phase relations of basaltic composition in the uppermost lower mantle. Geochim Cosmochim Acta 66:2099–2108
Hirose K, Fei Y, Ma Y, Mao HK (1999) The fate of subducted basaltic crust in the Earth’s lower mantle. Nature 397:53–56
Hirose K, Takafuji N, Sata N, Ohishi Y (2005) Phase transition and density of subducted MORB crust in the lower mantle. Earth Planet Sci Lett 237:239–251
Irifune T, Ringwood AE (1993) Phase transformations in subducted oceanic crust and buoyancy relationships depths of 600–800 km in the mantle. Earth Planet Sci Lett 117:101–110
Kesson SE, Fitz GJD, Shelley JMG (1994) Mineral chemistry and density of subducted basaltic crust at lower-mantle pressures. Nature 372:767–769
Litasov KD, Ohtani E (2005) Phase relations in hydrous MORB at 18–28 GPa: implications for heterogeneity of the lower mantle. Phys Earth Planet Inter 150:239–263
Miyajima N, Fujino K, Funamori N, Kondo T, Yagi T (1999) Garnet-perovskite transformation under conditions of the earth’s lower mantle: an analytical transmission electron microscopy study. Phys Earth Planet Inter 116:117–131
Miyajima N, Yagi T, Hirose K, Kondo T, Fujino K, Miura H (2001) Potential host phase of aluminum and potassium in the Earth’s lower mantle. Am Mineral 86:740–746
Oguri K, Funamori N, Uchida T, Miyajima N, Yagi T, Fujino K (2000) Post-garnet transition in a natural pyrope: a multi-anvil study based on in situ X-ray diffraction and transmission electron microscopy. Phys Earth Planet Inter 122:175–186
Ohishi Y, Hirao N, Sata N, Hirose K, Tanaka M (2008) Highly intense monochromatic X-ray diffraction facility for high-pressure research at SPring-8. High pressure research 28:163–173
Ono S, Ito E, Katsura T (2001) Mineralogy of subducted basaltic crust (MORB) from 25 to 37 GPa, and chemical heterogeneity of the lower mantle. Earth Planet Sci Lett 190:57–63
Ono A, Akaogi M, Kojitani H, Yamashita K, Kobayashi M (2009) High-pressure phase relations and thermodynamic properties of hexagonal aluminous phase and calcium-ferrite phase in the systems NaAlSiO4-MgAl2O4 and CaAl2O4-MgAl2O4. Phys Earth Planet Inter 174:39–49
Ozawa H, Hirose K, Tateno S, Sata N, Ohishi Y (2010) Phase transition boundary between B1 and B8 structures of FeO up to 210 GPa. Phys Earth Planet Inter 179:157–163
Perrillat JP, Ricolleau A, Daniel I, Fiquet G, Mezouar M, Guignot N, Cardon H (2006) Phase transformations of subducted basaltic crust in the upmost lower mantle. Phys Earth Planet Inter 157:139–149
Ricolleau A, Fiquet G, Addad A, Menguy N, Vanni C, Perrillat JP, Daniel I, Cardon H, Guignot N (2008) Analytical transmission electron microscopy study of a natural MORB sample assemblage transformed at high pressure and high temperature. Am Mineral 93:144–153
Ricolleau A, Perrillat JP, Fiquet G, Daniel I, Matas J, Addad A, Menguy N, Cardon H, Mezouar M, Guignot N (2010) Phase relations and equation of state of a natural MORB: implications for the density profile of subducted oceanic crust in the Earth’s lower mantle. J Geophys Res 115:B08202. doi:10.1029/2009JB006709
Sanehira T, Irifune T, Shinmei T, Brunet F, Funakoshi K, Nozawa A (2006) In situ X-ray diffraction study of an aluminous phase in MORB under lower mantle conditions. Phys Chem Miner 33:28–34
Shinmei T, Sanehira T, Yamazaki D, Inoue T, Irifune T, Funakoshi K, Nozawa A (2005) High-temperature and high-pressure equation of state for the hexagonal phase in the system NaAlSiO4-MgAl2O4. Phys Chem Miner 32:594–602
Tsuchiya T (2003) First-principles prediction of the P-V-T equation of state of gold and the 660-km discontinuity in Earth’s mantle. J Geophys Res 108:2462–2470. doi:10.1029/2003JB002446
Acknowledgments
We thank N. Sata for his support in the synchrotron experiments. Comments from anonymous reviewers helped to improve the manuscript. XRD measurements were taken at SPring-8 (proposal no. 2009B0087 and 2010A0087).
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Imada, S., Hirose, K. & Ohishi, Y. Stabilities of NAL and Ca-ferrite-type phases on the join NaAlSiO4-MgAl2O4 at high pressure. Phys Chem Minerals 38, 557–560 (2011). https://doi.org/10.1007/s00269-011-0427-2
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DOI: https://doi.org/10.1007/s00269-011-0427-2