Lu-Hf constraints on the evolution of lunar basalts
Very low Ti basalts andd green glass samples from the moon show high Lu/Hf ratios and low Hf concentrations. Low-Ti lunar basalts show high and variable Lu/Hf ratios and higher Hf concentrations, whereas high-Ti lunar basalts show low Lu/Hf ratios and high Hf concentrations. KREEP basalts have constant Lu/Hf ratios and high but variable Hf concentrations. Using the Lu-Hf behavior as a constraint, we propose a model for the mare basalts evolution. This constraint requires extensive crystallization of the primary lunar magma ocean prior to formation of the lunar mare basalt sources and the KREEP basalts. Mare basalts are produced by the melting of the cumulate rocks, and KREEP basalts represent the residual liquid of the magma ocean.
- Research Organization:
- U.S. Geological Survey, Denver
- OSTI ID:
- 7009838
- Journal Information:
- J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 89:S1; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BASALT
CRYSTALLIZATION
ELEMENTS
FRACTIONATION
GEOLOGY
HAFNIUM
IGNEOUS ROCKS
ISOTOPE RATIO
LUNAR MATERIALS
LUTETIUM
MATERIALS
MELTING
METALS
MOON
PETROLOGY
PHASE TRANSFORMATIONS
RARE EARTHS
ROCKS
SATELLITES
SEPARATION PROCESSES
TRANSITION ELEMENTS
VOLCANIC ROCKS