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Petrology, chemistry, age and irradiation history of Luna 24 samplesThe results of petrological, chemical, isotopic age determination and irradiation studies of sample 24170 from the 170 cm depth of the regolith core returned from Mare Crisium by Luna 24 are presented. The sample is found to be comprised of fragments from a single igneous rock, with mineralogical evidence indicating it to be a mare basalt. The crystallization age is determined by Sm-Nd and Ar(40)-Ar(39) ages to be 3.30 AE, establishing the presence of relatively young flows. All soil samples show low trace element compositions with minimum contamination by KREEPUTh-rich materials. Rb-Sr and Sm-Nd relations reflect the absence of significant fractionation at ages younger than 4.5 AE. One soil sample shows extremely large neutron capture effects, imposing a new lower limit to the neutron production rate in the regolith and requiring the addition of irradiated materials from depth.
Document ID
19790048530
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Wasserburg, G. J.
(California Inst. of Tech. Pasadena, CA, United States)
Papanastassiou, D. A.
(California Inst. of Tech. Pasadena, CA, United States)
Mcculloch, M. T.
(California Inst. of Tech. Pasadena, CA, United States)
Huneke, J. C.
(California Inst. of Tech. Pasadena, CA, United States)
Dymek, R. F.
(California Inst. of Tech. Pasadena, CA, United States)
Depaolo, D. J.
(California Inst. of Tech. Pasadena, CA, United States)
Chodos, A. A.
(California Inst. of Tech. Pasadena, CA, United States)
Albee, A. L.
(California Institute of Technology Pasadena, Calif., United States)
Radicati Di Brozolo, F.
(California Institute of Technology, Pasadena, Calif.; CNR, Laboratorio di Geoncronologia e Geochimica Isotopica Pisa, Italy)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Mare Crisium: The view from Luna 24; Conference
Location: Houston, TX
Start Date: December 1, 1977
End Date: December 3, 1977
Sponsors: NSF
Accession Number
79A32543
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-188
CONTRACT_GRANT: NGL-05-002-038
Distribution Limits
Public
Copyright
Other

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