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Consortium study of the unusual H chondrite regolith breccia, NoblesvilleThe Noblesville meteorite is a genomict, regolith breccia (H6 clasts in H4 matrix). Moessbauer analysis confirms that Noblesville is unusually fresh, not surprising in view of its recovery immediately after its fall. It resembles 'normal' H4-6 chondrites in its chemical composition and induced thermoluminescence (TL) levels. Thus, at least in its contents of volatile trace elements, Noblesville differs from other H chondrite, class A regolith breccias. Noblesville's small pre-atmospheric mass and fall near solar maximum and/or its peculiar orbit (with perihelion less than 0.8 AU as shown by natural TL intensity) may partly explain its levels of cosmogenic radionuclides. Its cosmic ray exposure age of about 44 Ma is long, is equalled or exceeded by less than 3 percent of all H chondrites, and also differs from the 33 +/- 3 Ma mean exposure age peak of other H chondrite regolith breccias. While Noblesville is now among the chondritic regolithic breccias richest in solar gases, elemental ratios indicate some loss, especially of He, perhaps by impacts in the regolith that heated individual grains. While general shock-loading levels in Noblesville did not exceed 4 GPa, individual clasts record shock levels of 5-10 GPa, doubtless acquired prior to lithification of the whole-rock meteoroid.
Document ID
19940035785
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lipschutz, Michael E.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Wolf, Stephen F.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Vogt, Stephan
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Michlovich, Edward
(Purdue Univ. West Lafayette, IN, United States)
Lindstrom, Marilyn M.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Zolensky, Michael E.
(NASA Johnson Space Center Houston, TX, United States)
Mittlefehldt, David W.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Satterwhite, Cecilia
(Lockheed Engineering and Sciences Co. Houston, TX, United States)
Schultz, Ludolf
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Loeken, Thomas
(Max-Planck-Inst. fuer Chemie Mainz, Germany)
Date Acquired
August 16, 2013
Publication Date
September 1, 1993
Publication Information
Publication: Meteoritics
Volume: 28
Issue: 4
ISSN: 0026-1114
Subject Category
Lunar And Planetary Exploration
Accession Number
94A12440
Funding Number(s)
CONTRACT_GRANT: NAG9-48
CONTRACT_GRANT: NSF DPP-88-17569
CONTRACT_GRANT: DE-FG07-80ER-10725
CONTRACT_GRANT: NAG9-81
PROJECT: RTOP 152-13-40-21
CONTRACT_GRANT: NATO-0252/89
CONTRACT_GRANT: NAS9-17538
CONTRACT_GRANT: NAG9-580
CONTRACT_GRANT: NAGW-2049
Distribution Limits
Public
Copyright
Other

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