Experimental REE Partitioning in Oldhamite: Implications for the Igneous Origin of Aubritic Oldhamite

Details Experimental REE Partitioning in Oldhamite: Implications for the Igneous Origin of Aubritic Oldhamite Experimental REE Partitioning in Oldhamite: Implications for the Igneous Origin of Aubritic Oldhamite

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..309d&link_type=abstract

Lunar and Planetary Science, volume 27, page 309

Computer Science

2

Aubrites, Oldhamite, Rare Earth Elements: Partitioning

Scientific paper

Aubrites (enstatite achondrites) are breccias consisting of FeO-free enstatite and a host of unusual, highly-reduced phases. Among these phases, oldhamite (CaS) has garnered special attention, since it is the major REE carrier in aubrites, has a variety of REE patterns comparable to those in unequilibrated enstatite chondrites, and has an extraordinarily high melting point as a pure substance (2525 degrees C). These latter two facts have caused some authors to assert that much of the aubritic oldhamite is an unmelted nebular relict, rather than of igneous origin. However, strong textural evidence of an igneous origin exists for at least some aubritic oldhamite. Despite this intense interest in oldhamite, few experimental studies have been conducted on oldhamite crystallization or REE partitioning. We have previously reported results of experiments using a eucritic bulk composition and early experiments using an aubritic composition, but which produced Ca-poor oldhamite. Here we report results for Ca-rich oldhamite that crystallized from an aubritic composition and discuss the implications for the genesis of aubritic oldhamite.

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