The crystal structures of synthetic Re- and PGE-bearing magnesioferrite spinels: Implications for impacts, accretion and the mantle.

Details The crystal structures of synthetic Re- and PGE-bearing magnesioferrite spinels: Implications for impacts, accretion and the mantle. The crystal structures of synthetic Re- and PGE-bearing magnesioferrite spinels: Implications for impacts, accretion and the mantle.

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..619r&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 4, p. 619-622

Physics

7

Mineralogy And Petrology: Crystal Chemistry, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Planetology: Solid Surface Planets: Impact Phenomena (Includes Cratering), Planetology: Solid Surface Planets: Interiors

Scientific paper

Re- and PGE-bearing magnesioferrite spinels were synthesized at oxidizing conditions between 0.1 MPa and 5.0 GPa, and 1150 to 1600°C in equilibrium with Re- or PGE-bearing metals and/or oxides. Electron microprobe analysis and single crystal X-ray diffraction techniques were employed to determine the composition, crystal structures and site occupancies, indicating that the magnesioferrite structure can accommodate wt% levels of Re and the platinum group elements (PGE) at oxidized conditions. These results suggest that magnesioferrite spinels found in K-T boundary samples worldwide could be an important host phase for the Ir, Ru, Os, Re, and Rh anomalies found in the boundary layer. Higher Ru/Ir values in Pacific magnesioferrite-bearing samples may be a reflection of higher condensation temperatures of the oxides. The distribution of PGE's in mantle and magmatic rocks may depend on the stability of spinel-structure oxides, especially those with a high magnesioferrite component. Finally, magnetic-rich meteorite fusion crusts may hold PGEs in oxidized form.

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