Computer Science
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2535l&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Sept. 1990, p. 2535-2547.
Computer Science
20
Crystallization, Magma, Mineralogy, Rare Earth Elements, Antarctic Regions, Calcium, Cerium, Europium, Olivine, Pyroxenes
Scientific paper
Analyses of mineral REE and selected minor and trace elements were carried out on individual grains of pyroxenes, whitlockite, maskelynite, and olivine of the Antarctic shergottite ALHA77005, and the results are used to interpret its parent magma and crystallization history. The results of mineral compositions and textural observations suggest that ALHA77005 is a cumulate with about half cumulus material (olivine + chromite) and half postcumulus phases. Most of the REEs in ALHA77005 reside in whitlockite whose modal concentration is about 1 percent. Mineral REE data support previous suggestions that plagioclase and whitlockite crystallized late, and that low-Ca pyroxene initiated crystallization before high-Ca pyroxene. The REE patterns for the intercumulus liquid, calculated from distribution coefficients for ALHA77005 pyroxene, plagioclase, and whitlockite, are in very good agreement and are similar to that of Shergotty.
Crozaz Ghislaine
Lundberg Laura L.
McSween Harry Y. Jr.
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