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REE Patterns in Lunar Zircons

Introduction: The unique ability of zircon to concentrate U, its wide distribution in the variety of rocks of different origin and composition and its stability under a range of P-T conditions make this mineral one of the most extensively studied accessory phases. Our initial application of zircon U-Pb systems to lunar rocks has evolved into investigation of the chemistry and textural characteristics of this mineral, driven by the necessity to identify the petrological, geochemical and genetic significance of the recorded U-Pb ages. We have studied the trace element geochemistry of zircon, and here we describe results aimed at identifying the significance of chondrite normalised REE patterns and their variation. In particular we attempt to: (i) determine the limits of variation of REE concentrations in zircon formed from magma of different composition , with the further aim of using this information as a petrogenetic indicator and (ii) use recently determined zircon-melt distribution coefficients for REE (