NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Very high potassium (VHK) basalt - Complications in mare basalt petrogenesisThe first comprehensive report on the petrology and geochemistry of Apollo 14 VHK (Very High Potassium) basalts and their implications for lunar evolution is presented. The reported data are most consistent with the hypothesis that VHK basalts formed through the partial assimilation of granite by a normal low-Ti, high-Al mare basalt magma. Assimilation was preceded by the diffusion-controlled exchange of alkalis and Ba between basalt magma and the low-temperature melt fraction of the granite. Hypotheses involving volatile/nonvolatile fractionations or long-term enrichment of the source regions in K are inconsistent with the suprachondritic Ba/La ratios and low initial Sr-87/Sr-86 ratios of VHK basalt. An important implication of this conclusion is that granite should be a significant component of the lunar crust at the Apollo 14 site.
Document ID
19860035314
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shervais, J. W.
(Tennessee, University Knoxville; South Carolina, University, Columbia, United States)
Taylor, L. A.
(Tennessee, University Knoxville, United States)
Laul, J. C.
(Battelle Pacific Northwest Laboratories Richland, WA, United States)
Shih, C.-Y.
(Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Nyquist, L. E.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 12, 2013
Publication Date
November 15, 1985
Publication Information
Publication: Journal of Geophysical Research, Supplement
Volume: 90
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
86A20052
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available