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A comparative Rb-Sr, Sm-Nd, and K-Ar study of shocked norite 78236 - Evidence of slow cooling in the lunar crustThe sample 78236 was chipped from the top of a norite boulder at Station 8 by the Apollo 17 landing team. Jackson et al. (1975) concluded that this rock formed at a depth of 8-30 km in the lunar crust and suggested that it was excavated by a large basin-forming impact event. A petrographic description of the boulder is provided, and isotopic analyses are discussed. Attention is given to a chronology for 78236 which seems to be most consistent with radiometric and other evidence. It is proposed that cumulate norite 78236 formed deep in the lunar crust approximately 4.4 AE ago. The rock cooled slowly in the crust until it was excavated by a major basin-forming event. Excavation may have occurred about 4.2 AE ago, but the time of this event is not well constrained.
Document ID
19820048146
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Nyquist, L. E.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Bogard, D. D.
(NASA Johnson Space Center Houston, TX, United States)
Wooden, J. L.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Bansal, B. M.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Wiesmann, H.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Shih, C.-Y.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Reimold, W. U.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Start Date: March 16, 1981
End Date: March 20, 1981
Accession Number
82A31681
Funding Number(s)
CONTRACT_GRANT: NASW-3389
Distribution Limits
Public
Copyright
Other

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