Siderite at lower mantle conditions and the effects of the pressure-induced spin-pairing transition

Details Siderite at lower mantle conditions and the effects of the pressure-induced spin-pairing transition Siderite at lower mantle conditions and the effects of the pressure-induced spin-pairing transition

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3623306l&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 23, CiteID L23306

Physics

4

Mineral Physics: High-Pressure Behavior, Mineral Physics: Equations Of State, Mineralogy And Petrology: Mantle Processes (1038), Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction, Mineralogy And Petrology: Mineral And Crystal Chemistry (1042)

Scientific paper

Siderite (FeCO3) forms a complete solid solution with magnesite (MgCO3), the most likely candidate for a mantle carbonate. Our experiments with natural siderite reveal spin pairing of d-orbital electrons of Fe2+ at 43 GPa, as evidenced by a sharp volume collapse of about 10%. The initially colorless crystals assume an intense green color after the transition, which progressively turns to red above 60 GPa. We present clear evidence for the instability of an intermediate spin state in siderite at ambient temperature. At the transition pressure, domains of high and low spin siderite coexist. The unit cell volume difference between magnesite and siderite is significantly decreased by the spin transition, enhancing the solubility between the two calcite-type minerals. A siderite component in magnesite at lower mantle pressure would significantly increase its density and slightly increase the carbonate bulk modulus.

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