Zr-Hf-Ta fractionation during lunar evolution

Details Zr-Hf-Ta fractionation during lunar evolution Zr-Hf-Ta fractionation during lunar evolution

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...16...31h&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

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3

Fractionation, Hafnium, Lunar Composition, Lunar Evolution, Tantalum, Zirconium, Abundance, Basalt, Cosmochemistry, Kreep, Magma, Moon, Evolution, Fractionation, Zirconium, Hafnium, Tantalum, Glass, Techniques, Kreep, Samples, Lunar, Basalt, Neutron Activation Analysis, Inaa, Element Ratios, Apollo 11, Apollo 12, Apollo 17, Apollo 14, Apollo 16, Petrogenesis, Ilmenite, Armolcolite, Crystallization, Partitioning, Laboratory Studies, Maria, Oxidation, Comparisons

Scientific paper

Zr/Hf ratios and other elemental data in 68 samples of various mare basalts, KREEP units, and lunar glasses have been determined using instrumental neutron activation analysis coupled with coincidence-anticoincidence counting for greater precision. The data are presented in order to quantify further the amount of Zr/Hf fractionation that has occurred during primordial crystallization and cumulate remelting or by any other process. Models of Zr-Hf evolution are developed to place additional constraints on the bulk lunar composition and on the effects of minor phases that may be responsible for the observed fractionations. The Hf-Ta fractionation in lunar compositions is also reviewed in order to characterize normal Hf(4+) versus Ta(4+) behavior and to delineate possible effects due to the oxidation of Ta(4+) to Ta(5+) during late-stage ilmenite crystallization.

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