Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth
Abundances of major, minor, and trace elements are determined in the Antarctic achondrite Allan Hills (ALHA) 77005 via sequential instrumental and radiochemical neutron activation analysis. The rare earth element (REE) abundances of ALHA 77005 reveal a unique chondritic normalized pattern; that is,...
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1982
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ftnasantrs:oai:casi.ntrs.nasa.gov:19820048232 2023-05-15T13:46:48+02:00 Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth Ma, M.-S. Schmitt, R. A. Laul, J. C. Unclassified, Unlimited, Publicly available JAN 1, 1982 http://ntrs.nasa.gov/search.jsp?R=19820048232 unknown http://ntrs.nasa.gov/search.jsp?R=19820048232 Accession ID: 82A31767 Copyright Other Sources 91 Lunar and Planetary Science Conference; March 16-20, 1981; Houston, TX 1982 ftnasantrs 2012-02-15T15:04:32Z Abundances of major, minor, and trace elements are determined in the Antarctic achondrite Allan Hills (ALHA) 77005 via sequential instrumental and radiochemical neutron activation analysis. The rare earth element (REE) abundances of ALHA 77005 reveal a unique chondritic normalized pattern; that is, the REEs are nearly unfractionated from La to Pr at approximately 1.0X chondrites, monotonically increased from Pr to Gd at approximately 3.4X with no Eu anomaly, nearly unfractionated from Gd and Ho and monotonically decreased from Ho to Lu at approximately 2.2X. It is noted that this unique REE pattern of ALHA 77005 can be modeled by a melting process involving a continuous melting and progressive partial removal of melt from a light REE enriched source material. In a model of this type, ALHA 77005 could represent either a crystallized cumulate from such a melt or the residual source material. Calculations show that the parent liquids for the shergottites could also be derived from a light REE enriched source material similar to that for ALHA 77005. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
91 |
spellingShingle |
91 Ma, M.-S. Schmitt, R. A. Laul, J. C. Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth |
topic_facet |
91 |
description |
Abundances of major, minor, and trace elements are determined in the Antarctic achondrite Allan Hills (ALHA) 77005 via sequential instrumental and radiochemical neutron activation analysis. The rare earth element (REE) abundances of ALHA 77005 reveal a unique chondritic normalized pattern; that is, the REEs are nearly unfractionated from La to Pr at approximately 1.0X chondrites, monotonically increased from Pr to Gd at approximately 3.4X with no Eu anomaly, nearly unfractionated from Gd and Ho and monotonically decreased from Ho to Lu at approximately 2.2X. It is noted that this unique REE pattern of ALHA 77005 can be modeled by a melting process involving a continuous melting and progressive partial removal of melt from a light REE enriched source material. In a model of this type, ALHA 77005 could represent either a crystallized cumulate from such a melt or the residual source material. Calculations show that the parent liquids for the shergottites could also be derived from a light REE enriched source material similar to that for ALHA 77005. |
format |
Other/Unknown Material |
author |
Ma, M.-S. Schmitt, R. A. Laul, J. C. |
author_facet |
Ma, M.-S. Schmitt, R. A. Laul, J. C. |
author_sort |
Ma, M.-S. |
title |
Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth |
title_short |
Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth |
title_full |
Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth |
title_fullStr |
Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth |
title_full_unstemmed |
Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth |
title_sort |
complementary rare earth element patterns in unique achondrites, such as alha 77005 and shergottites, and in the earth |
publishDate |
1982 |
url |
http://ntrs.nasa.gov/search.jsp?R=19820048232 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) |
geographic |
Antarctic The Antarctic Allan Hills |
geographic_facet |
Antarctic The Antarctic Allan Hills |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19820048232 Accession ID: 82A31767 |
op_rights |
Copyright |
_version_ |
1766245231774138368 |