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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Southern Africa
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Kaapvaal Craton (1)
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South America
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Argentina (1)
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Chile (1)
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United States
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Colorado Plateau (1)
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commodities
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aggregate (1)
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elements, isotopes
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hydrogen (1)
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isotope ratios (1)
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isotopes
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stable isotopes
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Fe-57/Fe-54 (1)
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metals
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iron
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Fe-57/Fe-54 (1)
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ferrous iron (1)
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minerals
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oxides
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aluminum oxides (1)
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ferropericlase (2)
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hydroxides
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aluminum hydroxides (1)
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perovskite (1)
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wustite (1)
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silicates
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chain silicates
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pyroxene group
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orthopyroxene
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enstatite (6)
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uranium minerals (1)
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Primary terms
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Africa
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Southern Africa
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Kaapvaal Craton (1)
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core (3)
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crystal chemistry (2)
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crystal structure (3)
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geophysical methods (1)
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geophysics (1)
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hydrogen (1)
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inclusions (1)
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isotopes
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stable isotopes
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Fe-57/Fe-54 (1)
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mantle (8)
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metals
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iron
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Fe-57/Fe-54 (1)
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ferrous iron (1)
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phase equilibria (2)
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South America
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Argentina (1)
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Chile (1)
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spectroscopy (4)
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United States
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Colorado Plateau (1)
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X-ray analysis (1)
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X-ray diffraction reveals two structural transitions in szomolnokite
Fe 3+ /Fe T ratios of amphiboles determined by high spatial resolution single-crystal synchrotron Mössbauer spectroscopy
Measurements of the Lamb-Mössbauer factor at simultaneous high-pressure-temperature conditions and estimates of the equilibrium isotopic fractionation of iron
Compressional behavior and spin state of δ-(Al,Fe)OOH at high pressures
Single-crystal equations of state of magnesiowüstite at high pressures
Equation of state and spin crossover of (Mg,Fe)O at high pressure, with implications for explaining topographic relief at the core-mantle boundary
Local structure variations observed in orthoenstatite at high pressures
Elasticity measurements on minerals: a review
Nuclear resonant X-ray spectroscopy of (Mg,Fe)SiO 3 orthoenstatites
Seismic evidence for orthopyroxene enrichment in the continental lithosphere
We summarize recent developments of nuclear resonant spectroscopy methods, such as nuclear resonant inelastic X-ray scattering and synchrotron Mössbauer spectroscopy, and their uses for the geophysical sciences. The inelastic method provides specific vibrational information, for example, the phonon density of states, and, in combination with compression data, it permits the determination of sound velocities and Grüneisen parameters under high pressure and high temperature. The Mössbauer method provides hyperfine interactions between the resonant nucleus and electronic environment, such as isomer shifts, quadrupole splittings, and magnetic fields, which provide important information on valence, spin state, and magnetic ordering. Both methods use a nuclear resonant isotope as a probe and can be applied under high pressure and high temperature. The physical mechanism of nuclear resonant scattering and the specifics in applications to Earth materials are presented with reference to several high-pressure studies on iron-bearing compounds.