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Rb-Sr age of troctolite 76535Rb-Sr systematics is studied for the lunar troctolite 76535 in phases covering a wide range of Rb and Sr concentrations. A line is obtained corresponding to an age of 4.61 plus or minus 0.07 AE and an initial Sr-87/Sr-86 of 0.69900 plus or minus 0.00003. The Rb-Sr age of 4.55 plus or minus 0.10 AE for the dunite (72417) and that of the troctolite are in approximate agreement and permit an interpretation that these rocks formed during a single major lunar differentiation which presumbly produced an anorthositic-gabbroic lunar crust and layered upper mantle.
Document ID
19770051915
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Papanastassiou, D. A. (California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J. (California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1976
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar Science Conference
Location: Houston, TX
Start Date: March 15, 1976
End Date: March 19, 1976
Accession Number
77A34767
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-188
Distribution Limits
Public
Copyright
Other

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