The Antarctic achondrite ALHA 76005: a polymict eucrite

Abstract-ALHA 76005 is a basaltic achondrite containing few. if any, orthopyroxenes. Its bulk major and trace element composition is like that of a non-cumu!ate eucrite, and unlike that of a howardite. It contains a variety of igneous clasts which differ in their textures, pyroxene/plagioclase ratio...

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Bibliographic Details
Main Authors: Copyright Pcrpamon, Lawrence Grossman, Edward Olsen, Andrew M. Davis, Tsuyoshi Tanaka, Glenn J. Macpherson
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 1980
Subjects:
Antarctic
The Antarctic
Antarc*
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.659.1651
http://geosci.uchicago.edu/%7Egrossman/GOD81GCA.pdf
Description
Summary:Abstract-ALHA 76005 is a basaltic achondrite containing few. if any, orthopyroxenes. Its bulk major and trace element composition is like that of a non-cumu!ate eucrite, and unlike that of a howardite. It contains a variety of igneous clasts which differ in their textures, pyroxene/plagioclase ratios and pyr-oxene and plagioclase compositions. One clast, No. 4, was found to have the REE pattern of a cumulate eucrite and an oxygen isotopic composition different from that of the bulk meteorite. Both the chemical and oxygen isotopic composition of clast No. 4 suggest that it was derived from a source different from its host. These observations lead to the conclusion that ALHA 76005 is a polymict eucrite.

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