The Source Mineralogy of High- and Low-Ti Basalts Based on Their HF Isotopic Composition

Details The Source Mineralogy of High- and Low-Ti Basalts Based on Their HF Isotopic Composition The Source Mineralogy of High- and Low-Ti Basalts Based on Their HF Isotopic Composition

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27...81b&link_type=abstract

Lunar and Planetary Science, volume 27, page 81

Computer Science

Basalt: Mare, Isotopes: Hafnium, Mantle

Scientific paper

The Lu-Hf isotopic system is ideally suited for determining the mineralogy of source regions because of the large mineral dependent Lu-Hf fractionations that occur during partial melting and crystallization. However, because of the analytical challenges of Hf isotopic analysis the Lu-Hf isotope system has not been widely applied to studies of petrogenesis. We have developed a new technique for Hf isotopic analysis and Lu and Hf concentration determination by isotope dilution mass-spectrometry that is ideally suited for Lu-Hf isotopic analysis of high-Ti basaltic rocks. Using this technique we have analyzed 5 high-Ti mare basalts; 2 Apollo 11 samples with high epsilon (sub)Nd values and 3 Apollo 17 samples with low epsilon (sub)Nd values. These new data complement the existing Hf isotopic analyses of high-Ti basalts, which consist of 4 Apollo 11 samples with low epsilon (sub)Nd values and 3 Apollo 17 samples with high epsilon (sub)Nd values. This combined data set clearly demonstrates that the Hf isotopic composition of high-Ti basalts is relatively constant over a range of epsilon (sub)Nd values. The Hf - Nd isotopic array of high-Ti basalts is in marked contrast to the Hf - Nd isotopic data of low-Ti basalts which defines a strong positive correlation with epsilon (sub)Hf = 4epislon (sub)Nd. The differences for the Hf and Nd isotopic arrays of low- and high-Ti basalts implies that the low- and high-Ti basalt source regions have been distinct over nearly the entire history of the Moon. Moreover, these source regions must have formed with distinctly different mineralogies.

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