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Laser probe /Ar-39/-/Ar-40/ dating of materials from consortium breccia 73215The unique capacity of the laser-probe (Ar-39)-(Ar-40) method to determine ages of constituents in a rock sample which are only of the order of 100 microns apart has been applied to measure ages of the different constituents of consortium breccia 73215. Evidence is given that the age of the melt-derived ground mass, 4.01 + or - 0.05 billion years, has no chronological significance. Instead, the best estimate for the age of the breccia-forming event, about 3.90 billion years, comes from the study of two clasts only a few hundred micrometers in size. The interpretation of this age as the age of the breccia-forming event is also supported by the studies of other consortium members and suggests a reinterpretation of the ages of most of the other Apollo 17 highland breccias.
Document ID
19780057790
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mueller, H. W.
(State Univ. of New York Stony Brook, NY, United States)
Schaeffer, O. A.
(New York, State University Stony Brook, N.Y., United States)
Plieninger, T.
(Max-Planck-Institut fuer Kernphysik Heidelberg, Germany)
James, O. B.
(U.S. Geological Survey Reston, Va., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 14, 1977
End Date: March 18, 1977
Accession Number
78A41699
Funding Number(s)
CONTRACT_GRANT: NGL-33-015-174
CONTRACT_GRANT: NASA ORDER T-3040-C
Distribution Limits
Public
Copyright
Other

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