Mathematics – Logic
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60..135b&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 60, Issue 1, p. 135-146.
Mathematics
Logic
5
Scientific paper
The polymict eucrite Petersburg contains eucritic and diogenitic materials which span a broad range of compositions. The present study focuses on four eucritic clasts for which bulk compositions and mineralogical data were acquired; the broad compositional range of these clasts documents the diversity of the parent regolith. Clast A is REE-rich (~26 × chondrite) and magnesian (Mg# = 48.7); composition of this clast can best be explained by partial melting of a source region distinctly different from that of other noncumulate eucrites. Composition of eucritic clast B is similar to compositions of cumulate eucrites in REE and Sr abundances, but it has a much lower Mg# than Moore County. Clasts C and D are similar in texture, mineralogy, and composition to main group eucrites. The presence of anomalous clast A in the same polymict breccia as typical eucrite clasts C and D emphasizes the variability of source materials from which eucritic melts were derived on the HED parent body(ies). After final accretion, this breccia apparently was exposed to a minor episode of thermal metamorphism causing ~30 μm wide alteration rims around larger pyroxene fragments and causing alteration of pyroxenes at the edges of eucritic clasts. This metamorphism completely altered the Mg# of smaller matrix pyroxenes, less than 40 60 μm in size, to values closer to the bulk Mg# of the meteorite.
Buchanan Paul C.
Reid Michael A.
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