Olivine diogenites - The mantle of the eucrite parent body

Two olivine-rich Antarctic diogenites (ALH A77256 and ALH 84001) of the howardite-eucrite-diogenite (HED) meteorite association have olivine/pyroxene ratios similar to normative ratios in devolatilized ordinary chondrites. Based on chemical data and petrological analysis, these meteorites represent...

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Bibliographic Details
Main Authors: Sack, Richard O., Azeredo, William J., Lipschutz, Michael E.
Format: Other/Unknown Material
Language:unknown
Published: 1991
Subjects:
91
Antarctic
Antarc*
Online Access:http://ntrs.nasa.gov/search.jsp?R=19910050068
Description
Summary:Two olivine-rich Antarctic diogenites (ALH A77256 and ALH 84001) of the howardite-eucrite-diogenite (HED) meteorite association have olivine/pyroxene ratios similar to normative ratios in devolatilized ordinary chondrites. Based on chemical data and petrological analysis, these meteorites represent the residuum of partial melting of the mantle in the eucrite parent body (EPB). Mineral assemblages in these olivine-rich diogenites record a continuum in thermal histories from initial partial melting (1150-1200 C) to subsolidus reequilibration (795 + or - 55 C). The small number of olivine-rich diogenites known hints that only the outer portion of the EPB has been sampled.

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