Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history
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 c...
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1990
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ftnasantrs:oai:casi.ntrs.nasa.gov:19910025973 2023-05-15T13:53:22+02:00 Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history Lundberg, Laura L. Crozaz, Ghislaine Mcsween, Harry Y., Jr. Unclassified, Unlimited, Publicly available Sep 1, 1990 http://ntrs.nasa.gov/search.jsp?R=19910025973 unknown http://ntrs.nasa.gov/search.jsp?R=19910025973 Accession ID: 91A10596 Copyright Other Sources 91 Geochimica et Cosmochimica Acta; 54; 2535-254 1990 ftnasantrs 2012-02-15T18:52:54Z 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. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic |
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NASA Technical Reports Server (NTRS) |
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unknown |
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91 |
spellingShingle |
91 Lundberg, Laura L. Crozaz, Ghislaine Mcsween, Harry Y., Jr. Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history |
topic_facet |
91 |
description |
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. |
format |
Other/Unknown Material |
author |
Lundberg, Laura L. Crozaz, Ghislaine Mcsween, Harry Y., Jr. |
author_facet |
Lundberg, Laura L. Crozaz, Ghislaine Mcsween, Harry Y., Jr. |
author_sort |
Lundberg, Laura L. |
title |
Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history |
title_short |
Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history |
title_full |
Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history |
title_fullStr |
Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history |
title_full_unstemmed |
Rare earth elements in minerals of the ALHA77005 shergottite and implications for its parent magma and crystallization history |
title_sort |
rare earth elements in minerals of the alha77005 shergottite and implications for its parent magma and crystallization history |
publishDate |
1990 |
url |
http://ntrs.nasa.gov/search.jsp?R=19910025973 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19910025973 Accession ID: 91A10596 |
op_rights |
Copyright |
_version_ |
1766258429558521856 |