Pomozdino - An anomalous, high-MgO/FeO, yet REE-rich eucriteA new chemical analysis and petrographic data for the Pomozdino basaltic achondrite are presented. Earlier indications that Pomozdino is a eucrite and that it is a monomict breccia with an anomalous, REE-rich, yet high-MgO/FeO bulk composition, are confirmed. Characteristics such as texture, composition, and REE concentration are examined and compared to those in other publications. A model for the origin of this meteorite, as a partial cumulate with an uncommonly high content of trapped liquid, is found to be preferable. Two alternatives of the origin are suggested, one of which implies that the parent melt is roughly similar in composition to Stannern. The other considers Pomozdino as a possible primary partial melt, derived from a source region far more magnesian than generally envisaged for the sources of primary eucritic partial melts. It is concluded that at least some Stannern-like eucrites were involved in fractional crystallization, and thus do not represent primary partial melts.
Document ID
19900046425
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Warren, P. H. (California Univ. Los Angeles, CA, United States)
Jerde, E. A. (California, University Los Angeles, United States)
Migdisova, L. F. (AN SSSR Institut Geokhimii i Analiticheskoi Khimii, Moscow, Ussr)
Iaroshevskii, A. A. (AN SSSR, Institut Geokhimii i Analiticheskoi Khimii; Moskovskii Gosudarstvennyi Universitet Moscow, Ussr)