Nitrogen and noble gases in a glass sample from LEW88516
The Antarctic meteorite LEW88516 has been classified as a member of the SNC group of meteorites, specifically a shergottite. It is reported to be remarkably similar in mineralogy, petrogenesis and chemistry to the previously known ALH77005 shergottite, with both being compositionally distinct from o...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19940007579 2023-05-15T14:03:46+02:00 Nitrogen and noble gases in a glass sample from LEW88516 Becker, R. H. Pepin, R. O. Unclassified, Unlimited, Publicly available JAN 1, 1993 http://ntrs.nasa.gov/search.jsp?R=19940007579 unknown http://ntrs.nasa.gov/search.jsp?R=19940007579 Accession ID: 94N12051 No Copyright Other Sources 25 Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 77-78 1993 ftnasantrs 2012-02-15T20:49:17Z The Antarctic meteorite LEW88516 has been classified as a member of the SNC group of meteorites, specifically a shergottite. It is reported to be remarkably similar in mineralogy, petrogenesis and chemistry to the previously known ALH77005 shergottite, with both being compositionally distinct from other shergottites. LEW88516 shows pervasive shock features and has been found to contain glass veins attributable to a shock origin. In an effort to determine whether the glass in LEW88516 contains any of the isotopically-heavy trapped nitrogen component observed in EETA 79001 glass, as well as the related high-Ar-40/Ar-36 and high-Xe-129/Xe-132 components, we undertook an analysis of an 11.9 mg glass sample (LEW88516,4) provided to us by H. Y. McSween, Jr. as part of a consortium study of this meteorite. Nitrogen and noble gases were extracted from LEW88516,4 in a series of combustion steps at increasing temperatures followed by a final pyrolysis. Initial steps at 550 C were intended to remove any surface-sited nitrogen-containing contaminants, while the 700 C step was expected to show the onset of release of a trapped argon component, based on our previous data for EETA 79001. It was hoped that the bulk of any trapped gas release would be concentrated in one of two steps at 1100 C and approximately 1400 C, maximizing our analytical sensitivity. Results of the analysis are shown. Except for He and Ne, data obtained for the 550 C steps will be omitted from further consideration on the assumption that they represent terrestrial contamination. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic |
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25 Becker, R. H. Pepin, R. O. Nitrogen and noble gases in a glass sample from LEW88516 |
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description |
The Antarctic meteorite LEW88516 has been classified as a member of the SNC group of meteorites, specifically a shergottite. It is reported to be remarkably similar in mineralogy, petrogenesis and chemistry to the previously known ALH77005 shergottite, with both being compositionally distinct from other shergottites. LEW88516 shows pervasive shock features and has been found to contain glass veins attributable to a shock origin. In an effort to determine whether the glass in LEW88516 contains any of the isotopically-heavy trapped nitrogen component observed in EETA 79001 glass, as well as the related high-Ar-40/Ar-36 and high-Xe-129/Xe-132 components, we undertook an analysis of an 11.9 mg glass sample (LEW88516,4) provided to us by H. Y. McSween, Jr. as part of a consortium study of this meteorite. Nitrogen and noble gases were extracted from LEW88516,4 in a series of combustion steps at increasing temperatures followed by a final pyrolysis. Initial steps at 550 C were intended to remove any surface-sited nitrogen-containing contaminants, while the 700 C step was expected to show the onset of release of a trapped argon component, based on our previous data for EETA 79001. It was hoped that the bulk of any trapped gas release would be concentrated in one of two steps at 1100 C and approximately 1400 C, maximizing our analytical sensitivity. Results of the analysis are shown. Except for He and Ne, data obtained for the 550 C steps will be omitted from further consideration on the assumption that they represent terrestrial contamination. |
format |
Other/Unknown Material |
author |
Becker, R. H. Pepin, R. O. |
author_facet |
Becker, R. H. Pepin, R. O. |
author_sort |
Becker, R. H. |
title |
Nitrogen and noble gases in a glass sample from LEW88516 |
title_short |
Nitrogen and noble gases in a glass sample from LEW88516 |
title_full |
Nitrogen and noble gases in a glass sample from LEW88516 |
title_fullStr |
Nitrogen and noble gases in a glass sample from LEW88516 |
title_full_unstemmed |
Nitrogen and noble gases in a glass sample from LEW88516 |
title_sort |
nitrogen and noble gases in a glass sample from lew88516 |
publishDate |
1993 |
url |
http://ntrs.nasa.gov/search.jsp?R=19940007579 |
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=19940007579 Accession ID: 94N12051 |
op_rights |
No Copyright |
_version_ |
1766274613061353472 |