Abstract
The partitioning of iron between Mg-rich perovskite (Pv) and ferropericlase (Fp) was investigated for a pyrolitic bulk composition over a wide range of simulated lower-mantle pressures and temperatures from 28 to 114 GPa and from 1,900 to 2,300 K, in a laser-heated diamond anvil cell (DAC). The recovered DAC samples are chemically homogeneous, indicating a relatively small temperature gradient during laser heating. The chemical compositions of coexisting Pv, Fp, and Ca-rich perovskite (CaPv) were determined by energy-dispersive X-ray spectroscopy (EDS) using an EDS instrument attached to a transmission electron microscope. Our results demonstrate that at pressures above 90 GPa, Pv becomes more Fe-rich with increasing pressure, which is likely due to the effects of high-spin to low-spin crossover of Fe3+ in Pv. We highlight that such a change in Fe–Mg partitioning between Pv and Fp should have a strong influence on the physical properties of the deep lower mantle.
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References
Akahama Y, Kawamura H (2004) High-pressure Raman spectroscopy of diamond anvils to 250 GPa: method for pressure determination in the multimegabar pressure range. J Appl Phys 96:3748–3751
Auzende AL, Badro J, Ryerson FJ, Weber PK, Fallon SJ, Addad A, Siebert J, Fiquet G (2008) Element partitioning between magnesium silicate perovskite and ferropericlase: new insights into bulk lower-mantle geochemistry. Earth Planet Sci Lett 269:164–174
Catalli K, Shim SH, Prakapenka V (2009) Thickness and Clapeyron slope of the post-perovskite boundary. Nature 462:782–785
Catalli K, Shim SH, Prakapenka VB, Zhao J, Sturhahn W, Chow P, Xiao Y, Liu H, Cynn H, Evans WJ (2010) Spin state of ferric iron in MgSiO3 perovskite and its effect on elastic properties. Earth Planet Sci Lett 289:68–75
Catalli K, Shim SH, Dera P, Prakapenka VB, Zhao J, Sturhahn W, Chow P, Xiao Y, Cynn H, Evans WJ (2011) Effects of the Fe3+ spin transition on the properties of aluminous perovskite-New insights for lower-mantle seismic heterogeneities. Earth Planet Sci Lett 310:293–302
Cliff G, Lorimer GW (1975) The quantitative analysis of thin specimens. J Microsc 103:203–207
Fei Y, Zhang L, Corgne A, Watson H, Ricolleau A, Meng Y, Prakapenka V (2007) Spin transition and equations of state of (Mg, Fe)O solid solutions. Geophys Res Lett 34:L17307
Fiquet G, Auzende AL, Siebert J, Corgne A, Bureau H, Ozawa H, Garbarino G (2010) Melting of peridotite to 140 gigapascals. Science 329:1516–1518
Frost DJ, Langenhorst F (2002) The effect of Al2O3 on Fe–Mg partitioning between magnesiowüstite and magnesium silicate perovskite. Earth Planet Sci Lett 199:227–241
Frost DJ, Liebske C, Langenhorst F, McCammon CA, Trønnes RG, Rubie DC (2004) Experimental evidence for the existence of iron-rich metal in the Earth’s lower mantle. Nature 428:409–412
Fujino K, Miyajima N, Yagi T, Kondo T, Funamori N (1998) Analytical electron microscopy of the garnet-perovskite transformation in a laser-heated diamond anvil cell. In: Manghnani MH, Yagi T (eds) Properties of earth and planetary materials at high pressure and temperature. Geophys Monogr Ser, vol 101. AGU, Washington DC, pp 409–417
Fujino K, Nishio-Hamane D, Seto Y, Sata N, Nagai T, Shinmei T, Ishii H, Hiraoka N, Cai YQ, Tsuei K (2012) Spin transition of ferric iron in Al-bearing Mg-perovskite up to 200 GPa and its implication for the lower mantle. Earth Planet Sci Lett 317–318:407–412
Hirose K, Sata N, Komabayashi T, Ohishi Y (2008) Simultaneous volume measurements of Au and MgO to 140 GPa and thermal equation of state of Au based on the MgO pressure scale. Phys Earth Planet Inter 167:149–154
Hsu H, Blaha P, Cococcioni M, Wentzcovitch M (2011) Spin-state crossover and hyperfine interactions of ferric iron in MgSiO3 perovskite. Phys Rev Lett 106:118501
Irifune T (1994) Absence of an aluminous phase in the upper part of the Earth’s lower mantle. Nature 370:131–133
Irifune T, Shinmei T, McCammon CA, Miyajima N, Rubie D, Frost DJ (2010) Iron partitioning and density changes of pyrolite in Earth’s lower mantle. Science 327:193–195
Jackson JM, Sturhahn W, Shen G, Zhao J, Hu MY, Errandonea D, Bass JD, Fei Y (2005) A synchrotron Mössbauer spectroscopy study of (Mg, Fe)SiO3 perovskite up to 120 GPa. Am Mineral 90:199–205
Jacobsen SD, Reichmann HJ, Spetzler HA, Mackwell SJ, Smyth JR, Angel RJ, McCammon CA (2002) Structure and elasticity of single-crystal (Mg, Fe)O and a new method of generating shear waves for gigahertz ultrasonic interferometry. J Geophys Res 107(B2):2037
Kesson SE, Fitz Gerald JD, Shelley JM (1998) Mineralogy and dynamics of a pyrolite lower mantle. Nature 393:252–255
Kobayashi Y, Kondo T, Ohtani E, Hirao N, Miyajima N, Yagi T, Nagase T, Kikegawa T (2005) Fe–Mg partitioning between (Mg, Fe)SiO3 post-perovskite, perovskite, and magnesiowüstite in the Earth’s lower mantle. Geophys Res Lett 32:L19301
Li L, Brodholt JP, Stackhouse S, Weidner DJ, Alfredsson M, Price GD (2005a) Electronic spin state of ferric iron in Al-bearing perovskite in the lower mantle. Geophys Res Lett 32:L17307
Li L, Brodholt JP, Stackhouse S, Weidner DJ, Alfredsson M, Price GD (2005b) Elasticity of (Mg, Fe)(Si, Al)O3-perovskite at high pressure. Earth Planet Sci Lett 240:529–536
Lin JF, Tsuchiya T (2008) Spin transition of iron in the Earth’s lower mantle. Phys Earth Planet Inter 170:248–259
Lin JF, Vankό G, Jacobsen SD, Iota V, Struzhkin VV, Prakapenka VB, Kuznetsov A, Yoo C (2007) Spin transition zone in Earth’s lower mantle. Science 317:1740–1743
Manthilake GM, de Koker N, Frost DJ, McCammon CA (2011) Lattice thermal conductivity of lower mantle minerals and heat flux from Earth’s core. Proc Natl Acad Sci USA 108:17901–17904
Mao HK, Shen G, Hemley RJ (1997) Multivariable dependence of Fe–Mg partitioning in the lower mantle. Science 278:2098–2100
McCammon C (1997) Perovskite as a possible sink for ferric iron in the lower mantle. Nature 387:694–696
McCammon CA, Stachel T, Harris JW (2004) Iron oxidation state in lower mantle mineral assemblages II. Inclusions in diamonds from Kankan, Guinea. Earth Planet Sci Lett 222:423–434
Murakami M, Hirose K, Sata N, Ohishi Y (2005) Post-perovskite phase transition and mineral chemistry in the pyrolitic lowermost mantle. Geophys Res Lett 32:L03304
Nakajima Y, Frost DJ, Rubie DC (2012) Ferrous iron partitioning between magnesium silicate perovskite and ferropericlase and the composition of perovskite in the Earth’s lower mantle. J Geophys Res 117:B08201
Nishiyama N, Yagi T (2003) Phase relation and mineral chemistry in pyrolite to 2200 ºC under the lower mantle pressures and implications for dynamics of mantle plumes. J Geophys Res 108(B5):2255
Nishiyama N, Irifune T, Inoue T, Ando J, Funakoshi K (2004) Precise determination of phase relations in pyrolite across the 660 km seismic discontinuity by in situ X-ray diffraction and quench experiments. Phys Earth Planet Inter 143–144:185–199
Ohta K, Onoda S, Hirose K, Sinmyo R, Shimizu K, Sata N, Ohishi Y, Yasuhara A (2008) The electrical conductivity of post-perovskite in Earth’s D” layer. Science 320:89–91
Ozawa H, Hirose K, Mitome M, Bando Y, Sata N, Ohishi Y (2009) Experimental study of reaction between perovskite and molten iron to 146 GPa and implications for chemically distinct buoyant layer at the top of the core. Phys Chem Miner 36:355–363
Ricolleau A, Fei Y, Cottrell E, Watson H, Deng L, Zhang L, Fiquet G, Auzende AL, Roskosz L, Morard G, Prakapenka V (2009) Density profile of pyrolite under the lower mantle conditions. Geophys Res Lett 36:L06302
Sinmyo R, Hirose K (2010) The Soret diffusion in laser-heated diamond-anvil cell. Phys Earth Planet Inter 180:172–178
Sinmyo R, Hirose K, Nishio-Hamane D, Seto Y, Fujino K, Sata N, Ohishi Y (2008) Partitioning of iron between perovskite/post-perovskite and ferropericlase in the lower mantle. J Geophys Res 113:B11204
Sinmyo R, Hirose K, Muto S, Ohishi Y, Yasuhara A (2011) The valence state and partitioning of iron in the Earth’s lowermost mantle. J Geophys Res 116:B07205
Stackhouse S, Brodholt JP, Price GD (2006) Elastic anisotropy of FeSiO3 end-members of the perovskite and post-perovskite phases. Geophys Res Lett 33:L01304
Stackhouse S, Brodholt JP, Price GD (2007) Electric spin transitions in iron-bearing MgSiO3 perovskite. Earth Planet Sci Lett 253:282–290
Tateno S, Sinmyo R, Hirose K, Nishioka H (2009) The advanced ion-milling method for preparation of thin film using ion slicer: application to a sample recovered from diamond-anvil cell. Rev Sci Instrum 80:013901
Wood BJ (2000) Phase transitions and partitioning relations in peridotite under lower mantle conditions. Earth Planet Sci Lett 174:341–354
Wood BJ, Rubie DC (1996) The effect of alumina on phase transitions at the 660-kilometer discontinuity from Fe–Mg partitioning experiments. Science 273:1522–1524
Xu Y, McCammon C, Poe BT (1998) The effect of Alumina on the electrical conductivity of silicate perovskite. Science 282:922–924
Yamazaki D, Karato S (2002) Fabric development in (Mg, Fe)O during large strain, shear deformation: implications for seismic anisotropy in Earth’s lower mantle. Phys Earth Planet Inter 131:251–267
Yamazaki D, Yoshino T, Matsuzaki T, Katsura T, Yoneda A (2009) Texture of (Mg, Fe)SiO3 perovskite and ferro-periclase aggregate: implications for rheology of the lower mantle. Phys Earth Planet Inter 174:138–144
Zhang F, Oganov AR (2006) Mechanism of Al3+ incorporation in MgSiO3 post-perovskite at high pressures. Earth Planet Sci Lett 248:69–76
Acknowledgments
R. S. was supported by a Research Fellowship for Young Scientists and a Postdoctoral Fellowship for Research Abroad, granted by JSPS. Review comments by two anonymous referees and editor helped significantly in improving the manuscript.
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Sinmyo, R., Hirose, K. Iron partitioning in pyrolitic lower mantle. Phys Chem Minerals 40, 107–113 (2013). https://doi.org/10.1007/s00269-012-0551-7
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DOI: https://doi.org/10.1007/s00269-012-0551-7