The source region and melting mineralogy of high-titanium and low-titanium lunar basalts deduced from Lu-Hf isotope data

Details The source region and melting mineralogy of high-titanium and low-titanium lunar basalts deduced from Lu-Hf isotope data The source region and melting mineralogy of high-titanium and low-titanium lunar basalts deduced from Lu-Hf isotope data

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gecoa..62..525b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 62, p. 525

Mathematics

Logic

34

Mineralogy, Melting, Titanium, Lunar Rocks, Basalt, Lutetium Isotopes, Hafnium Isotopes, Lunar Geology, Abundance, Lunar Landing Sites, Apollo 11 Flight, Apollo 17 Flight, Neodymium Isotopes, Trace Elements, Samarium Isotopes

Scientific paper

The Hf isotope composition in high-titanium basalts from Apollo landing sites is determined. The initial epsilon(Hf) values measured for mare basalts are used to calculate the time-integrated Lu/Hf ratio required for the source. The calculalted (Lu/HF)n source ratio is then compared to the Lu/Hf ratio that is measured for the basalt; differences between the source and magma Lu/Hf ratios reflect differences in bulk Lu/Hf partition coefficients and the degree of partial melting. It is concluded that the Hf and Nd isotope compositions of low- and high-Ti basalts can only be explained by a long-lived, mineralogically distinct sources. The low Lu/Hf ratios of high- and low-Ti basalts require significant fractionation of Lu from Hf because these basalts were derived from a source with high Lu/Hf ratios. Such extreme Lu/Hf fractionations require either very small degrees of partial melting or melting of a source that has a Lu retentive phase such as garnet. The moderate Sm/Nd ratios of high- and low-Ti basalts requires little fractionation of Sm from Nd.

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