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Rb-Sr ages of igneous rocks from the Apollo 14 mission and the age of the Fra Mauro formation.Internal Rb-Sr isochrons were determined on four basaltic rocks and on a basaltic clast from a breccia from the Fra Mauro landing site. An internal isochron was determined for rock 12004 and yielded a value in agreement with previous results for basaltic rocks from the Apollo 12 site. The crystallization ages for Apollo 14 basalts are only 0.2 to 0.3 AE older than were found for mare basalts from the Sea of Tranquility. Assuming these leucocratic igneous rocks to be representative of the Fra Mauro site, it follows that there were major igneous processes active in these regions, and presumably throughout the highlands, at times only slightly preceding the periods at which the maria were last flooded.
Document ID
19720026387
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Papanastassiou, D. A.
Wasserburg, G. J.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
September 1, 1971
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 12
Subject Category
Space Sciences
Accession Number
72A10053
Funding Number(s)
CONTRACT_GRANT: NSF GP-19887
CONTRACT_GRANT: NAS9-8074
Distribution Limits
Public
Copyright
Other

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