Thorium and uranium variations in Apollo 17 basalts, and K-U systematics

Details Thorium and uranium variations in Apollo 17 basalts, and K-U systematics Thorium and uranium variations in Apollo 17 basalts, and K-U systematics

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976lpsc....7.1545l&link_type=abstract

In: Lunar Science Conference, 7th, Houston, Tex., March 15-19, 1976, Proceedings. Volume 2. (A77-34651 15-91) New York, Pergamon

Other

Apollo 17 Flight, Basalt, Lunar Composition, Potassium, Thorium, Uranium, Astronomical Models, Crystallization, Lunar Maria, Lunar Rocks, Mass Ratios, Melting, Petrology, Thermal Simulation

Scientific paper

It is found that Apollo 11 low-K and in particular Apollo 17 mare basalts show a wide range of Th/U ratios unlike other rocks; such variations cannot be explained by near surface crystal fractionation. A two-stage fractional crystallization-partial melting model involving a clinopyroxene cumulate as the major phase can explain the variations in Th/U ratios. Due to the Sm-Nd systematics constraint, several source cumulates are invoked to explain the observed Th/U continuum.

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