The Antarctic achondrite ALHA 76005: a polymict eucrite |
| |
| Authors: | Lawrence Grossman Edward Olsen Andrew M Davis Tsuyoshi Tanaka Glenn J MacPherson |
| |
| Institution: | 1. Department of the Geophysical Sciences and Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, U.S.A.;2. Department of Geology, Field Museum of Natural History, Chicago, IL 60605, U.S.A.;3. Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, U.S.A. |
| |
| 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-cumulate eucrite, and unlike that of a howardite. It contains a variety of igneous clasts which differ in their textures, pyroxene/plagioclase ratios and pyroxene 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. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
