Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3823308m&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 23, CiteID L23308
Physics
Mineralogy And Petrology: Mantle Processes (1038), Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
The thermal equation of state of ferropericlase [(Mg0.75Fe0.25)O] has been investigated by synchrotron X-ray diffraction up to 140 GPa and 2000 K in a laser-heated diamond anvil cell. Based on results at high pressure-temperature conditions, the derived phase diagram shows that the spin crossover widens at elevated temperatures. Along the lower-mantle geotherm, the spin crossover occurs between 1700 km and 2700 km depth. Compared to the high-spin state, thermoelastic modeling of the data shows a ˜1.2% increase in density, a factor of two increase in thermal expansion coefficient over a range of 1000 km, and a maximum decrease of 37% and 13% in bulk modulus and bulk sound velocity, respectively, at ˜2180 km depth across the spin crossover. These anomalous behaviors in the thermoelastic properties of ferropericlase across the spin crossover must be taken into account in order to understand the seismic signatures and geodynamics of the lower mantle.
Lin Jung-Fu
Liu Jin
Mao Zhu
Prakapenka Vitali B.
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