Compositions of three low-FeO ordinary chondrites: Indications of a common origin with the H chondrites

Details Compositions of three low-FeO ordinary chondrites: Indications of a common origin with the H chondrites Compositions of three low-FeO ordinary chondrites: Indications of a common origin with the H chondrites

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011gecoa..75.6511t&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 75, Issue 21, p. 6511-6519.

Computer Science

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Scientific paper

Burnwell, EET 96031, and LAP 04575 are ordinary chondrites (OC) that possess lower than typical olivine Fa content than has been established for the H chondrites (<˜17 mol%). Mean low-Ca pyroxene Fs contents are typically lower than mean Fa content, with generally ⩽16 mol% Fs. We have investigated these three low-FeO chondrites by measuring their trace element abundances, oxygen isotopic compositions, and examining their three-dimensional (3D) petrography with synchrotron X-ray microtomography. We compare our results with those established for more common OC. The low FeO chondrites studied here have bulk trace element abundances that are identical to the H chondrites. From bulk oxygen isotopic analysis, we show that Burnwell, EET 96010, and LAP 04757 sampled oxygen reservoirs identical to the H chondrites. Burnwell, EET 96031, and LAP 04575 possess common 3D opaque mineral structures that could be distinct from the H chondrites, as evidenced by X-ray microtomographic analysis, but our comparison suite of H chondrites is small and unrepresentative. Overall, our data suggest a common origin for the low-FeO chondrites Burnwell, EET 96010, and LAP 04757 and the H chondrites. These three samples are simply extreme members of a redox process where a limiting nebular oxidizing agent, probably ice, reacted with material containing slightly higher amounts of metal than typically seen in the H chondrites.

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