Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..521g&link_type=abstract
Meteoritics & Planetary Science, vol. 35, no. 3, pp. 521-536 (2000).
Other
16
Scientific paper
QUE 93148 is a small (1.1 g) olivine-rich achondrite (mg 86) that contains variable amounts of orthopyroxene (mg 87) and kamacite (6.7 wt.% Ni), with minor augite. Olivine in QUE 93148 contains an unusual suite of inclusions: 1) 5 x 100 ?m-sized lamellae with a CaO- and Cr2O3-rich (~10 and 22 wt.%, respectively) composition that may represent a submicrometer-scale intergrowth of chromite and pyroxene(s); 2) 75 x 500 ?m-sized lamellar symplectites comprised of chromite and two pyroxenes, with minor metal; 3) 15-20 ?m-sized, irregularly-shaped symplectites comprised of chromite and pyroxene(s); 4) 100-150 ?m-sized, elliptical inclusions comprised of chromite, two pyroxenes, metal, troilite, and rare whitlockite. Type 1, 2 and 3 inclusions probably formed by exsolution from the host olivine during slow cooling, whereas type 4 more likely resulted from early entrapment of silicate and metallic melts followed by closed-system oxidation. QUE 93148 can be distinguished from most other olivine-rich achondrites (ureilites, winonaites, lodranites, acapulcoites, brachinites, Eagle Station-type pallasites and pyroxene pallasites), as well as from mesosiderites, by some or all of the following properties: oxygen isotopic composition, Fe-Mn-Mg relations of olivine, CaO and Cr2O3 contents of olivine, orthopyroxene compositions, molar Cr/(Cr+Al) ratios of chromite, metal composition, texture, and the presence of the inclusions. In terms of many of these properties, it shows an affinity to main group pallasites. Nevertheless, it cannot be identified as belonging to this group. QUE 93148 appears to be a unique achondrite. Possibly it should be considered to be a pyroxene pallasite that is genetically related to main group pallasites. Alternatively, it may be derived from the mantle of the pallasite (HED?) parent body.
Goodrich Cyrena Anne
Righter Kevin
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