Elasticity and high-pressure behavior of Mg2Cr2O5 and CaTi2O4-type phases of magnesiochromite and chromite
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Sean R. Shieh
Abstract
In situ high-pressure and high-temperature X-ray diffraction studies on magnesiochromite, MgCr2O4, and a natural chromite, (Mg,Fe)(Al,Cr)2O4, using a laser-heated diamond-anvil cell technique were performed at pressures to ~45 GPa. Our results on MgCr2O4 at ~15 GPa showed temperature-induced dissociation of MgCr2O4 to Cr2O3+MgO below ~1500 K and formation of modified ludwigite (mLd)-type Mg2Cr2O5+Cr2O3 above ~1500 K. Above 20 GPa, only a single phase with the CaTi2O4-type structure of MgCr2O4 was observed at 1400–2000 K. A second-order Birch-Murnaghan fit to pressure-volume data for the CaTi2O4-type phase of MgCr2O4 yields zero-pressure volume (V0) = 264.4(8) Å3 and bulk modulus (K0) = 185.4(4) GPa, and for the CaTi2O4-type structure of natural (Mg,Fe)(Al,Cr)2O4 yields V0 = 261(1) Å3 and K0 = 175.4(2) GPa. A second-order Birch-Murnaghan fit to pressure-volume data of mLd-type Mg2Cr2O5 yields V0 = 338.9(8) Å3 and K0 = 186.5(6) GPa. The obtained high-pressure phase relations of chromite spinels can be used as an indicator for shock pressure in impact rocks and meteorites. The bulk moduli of the high-pressure phases of MgCr2O4 and FeCr2O4 can help develop a thermodynamic model for Mg and Fe end-member spinels in the upper mantle and transition zone.
Funding statement: This work was supported by NSERC and performed at GeoSoilEnviroCARS (Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation—Earth Sciences (EAR-1128799) and Department of Energy—GeoSciences (DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Use of the COMPRES-GSECARS gas loading system was supported by COMPRES under NSF Cooperative Agreement EAR 11-57758 and by GSECARS through NSF grant EAR-1128799 and DOE grant DE-FG02-94ER14466. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Acknowledgments
We thank the constructive comments from Tony Withers, the two anonymous reviewers, and the editor that helped improve the quality of this manuscript.
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- Synthesis of calcium orthocarbonate, Ca2CO4-Pnma at P-T conditions of Earth’s transition zone and lower mantle
- Melting phase relation of Fe-bearing Phase D up to the uppermost lower mantle
- Evidence from HP/UHP metasediments for recycling of isotopically heterogeneous potassium into the mantle
- Effect of sulfur on siderophile element partitioning between olivine and a primary melt from the martian mantle
- Gold speciation in hydrothermal fluids revealed by in situ high energy resolution X-ray absorption spectroscopy
- Characterization of carbon phases in Yamato 74123 ureilite to constrain the meteorite shock history
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