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1990•Geophysical Research LettersRequires access

Experimental petrology of the lower mantle: A natural peredottte taken to 54 GPA

Bridget O’Neill, Raymond Jeanloz

Open publisher page 64 citations

Abstract

The high‐pressure mineral assemblage produced from a natural peridotite sample (xMg = 0.897) has been synthesized in the laser‐heated diamond cell and identified by x‐ray diffraction at 54 GPa. Orthorhombic perovskite, (Mg,Fe)SiO3, magnesiowüstite, (Mg,Fe)O, and cubic perovskite, CaSiO3, are observed in estimated molar ratios of 1.00 : 0.46 : 0.08 (1.00 : 0.21 : 0.09 by volume) respectively, with no evidence of other phases being present. The lattice parameters measured at 54 GPa yield a density of 4.97(±0.03) Mg/m3 for the high pressure assemblage at 300 K, in good agreement with prior calculations of density for candidate lower mantle assemblages.

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What this paper is about

The high‐pressure mineral assemblage produced from a natural peridotite sample (xMg = 0.897) has been synthesized in the laser‐heated diamond cell and identified by x‐ray diffraction at 54 GPa. Orthorhombic perovskite, (Mg,Fe)SiO3, magnesiowüstite, (Mg,Fe)O, and cubic perovskite, CaSiO3, are observed in estimated molar ratios of 1.00 : 0.46 : 0.08 (1.00 : 0.21 : 0.09 by volume) respectively, with no evidence of other phases being present. The lattice parameters measured at 54 GPa yield a density of 4.97(±0.03) Mg/m3 for the high pressure assemblage at 300 K, in good agreement with prior calculations of density for candidate lower mantle assemblages.

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Available abstract

The high‐pressure mineral assemblage produced from a natural peridotite sample (xMg = 0.897) has been synthesized in the laser‐heated diamond cell and identified by x‐ray diffraction at 54 GPa. Orthorhombic perovskite, (Mg,Fe)SiO3, magnesiowüstite, (Mg,Fe)O, and cubic perovskite, CaSiO3, are observed in estimated molar ratios of 1.00 : 0.46 : 0.08 (1.00 : 0.21 : 0.09 by volume) respectively, with no evidence of other phases being present. The lattice parameters measured at 54 GPa yield a density of 4.97(±0.03) Mg/m3 for the high pressure assemblage at 300 K, in good agreement with prior calculations of density for candidate lower mantle assemblages.

Key concepts: Peridotite, Orthorhombic crystal system, Geology, Mantle (geology), Mineralogy, Wüstite, Diamond anvil cell, Materials science

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