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(Ar-39)-(Ar-40) dating of mesosiderites - Evidence for major parent body disruption less than 4 Ga agoThe (Ar-39) (Ar-40) chronologies were determined for 14 different mesosiderites representing the full range of classification according to recrystallization, and these chronologies were compared with analogous data for other meteorite types and for lunar highland rocks. Results of Ar-Ar chronologies indicate the history of a degassing of Ar due to a major thermal event that occurred less than 3.9 Ga ago; this event is not the metal-silicate mixing event, which is known to have occurred earlier than 4.4 Ga ago. It is suggested that a major collisional disruption-reassembly event less than 3.9 Ga ago took place, leaving the metal-silicate breccias buried under tens of kilometers of rubble, where they cooled slowly through the Ar closure temperatures.
Document ID
19910025974
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bogard, D. D.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Jordan, J. L.
(NASA Johnson Space Center Houston, TX, United States)
Garrison, D. H.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Mittlefehldt, D.
(Lockheed Engineering and Sciences Co. Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1990
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 54
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
91A10597
Distribution Limits
Public
Copyright
Other

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