Allan Hills A77219 - The first Antarctic mesosiderite
The abundance of orthopyroxene, inverted pigeonite, plagioclase, tridymite, kamacite, and tetrataenite, plus the whole rock analysis, indicates that ALHA 77219 is a mesosiderite. The presence of inverted pigeonite rims on orthopyroxene clasts plus the range of Fe/Mg and Fe/Mn ratios for pyroxene and...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19820038773 2023-05-15T13:46:48+02:00 Allan Hills A77219 - The first Antarctic mesosiderite Agosto, W. N. Hewins, R. H. Clarke, R. S., Jr. Unclassified, Unlimited, Publicly available JAN 1, 1980 http://ntrs.nasa.gov/search.jsp?R=19820038773 unknown http://ntrs.nasa.gov/search.jsp?R=19820038773 Accession ID: 82A22308 Copyright Other Sources 91 Lunar and Planetary Science Conference; March 17-21, 1980; Houston, TX 1980 ftnasantrs 2012-02-15T15:02:07Z The abundance of orthopyroxene, inverted pigeonite, plagioclase, tridymite, kamacite, and tetrataenite, plus the whole rock analysis, indicates that ALHA 77219 is a mesosiderite. The presence of inverted pigeonite rims on orthopyroxene clasts plus the range of Fe/Mg and Fe/Mn ratios for pyroxene and olivine are characteristic of mesosiderites. All the petrographic and chemical data are consistent with classification of ALHA 77219 as a mesosiderite and, because the matrix is fine-grained and little recrystallized, as a subgroup I mesosiderite. The Fe/Mn trends in pyroxenes of mesosiderites such as ALHA 77219 can be explained by igneous fractionation of pyroxene along with metal and subsequent subsolidus reduction in the breccia. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
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91 |
spellingShingle |
91 Agosto, W. N. Hewins, R. H. Clarke, R. S., Jr. Allan Hills A77219 - The first Antarctic mesosiderite |
topic_facet |
91 |
description |
The abundance of orthopyroxene, inverted pigeonite, plagioclase, tridymite, kamacite, and tetrataenite, plus the whole rock analysis, indicates that ALHA 77219 is a mesosiderite. The presence of inverted pigeonite rims on orthopyroxene clasts plus the range of Fe/Mg and Fe/Mn ratios for pyroxene and olivine are characteristic of mesosiderites. All the petrographic and chemical data are consistent with classification of ALHA 77219 as a mesosiderite and, because the matrix is fine-grained and little recrystallized, as a subgroup I mesosiderite. The Fe/Mn trends in pyroxenes of mesosiderites such as ALHA 77219 can be explained by igneous fractionation of pyroxene along with metal and subsequent subsolidus reduction in the breccia. |
format |
Other/Unknown Material |
author |
Agosto, W. N. Hewins, R. H. Clarke, R. S., Jr. |
author_facet |
Agosto, W. N. Hewins, R. H. Clarke, R. S., Jr. |
author_sort |
Agosto, W. N. |
title |
Allan Hills A77219 - The first Antarctic mesosiderite |
title_short |
Allan Hills A77219 - The first Antarctic mesosiderite |
title_full |
Allan Hills A77219 - The first Antarctic mesosiderite |
title_fullStr |
Allan Hills A77219 - The first Antarctic mesosiderite |
title_full_unstemmed |
Allan Hills A77219 - The first Antarctic mesosiderite |
title_sort |
allan hills a77219 - the first antarctic mesosiderite |
publishDate |
1980 |
url |
http://ntrs.nasa.gov/search.jsp?R=19820038773 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) |
geographic |
Antarctic Allan Hills |
geographic_facet |
Antarctic Allan Hills |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19820038773 Accession ID: 82A22308 |
op_rights |
Copyright |
_version_ |
1766245230079639552 |