Hf, Zr, and REE partition coefficients between ilmenite and liquid - Implications for lunar petrogenesis

Details Hf, Zr, and REE partition coefficients between ilmenite and liquid - Implications for lunar petrogenesis Hf, Zr, and REE partition coefficients between ilmenite and liquid - Implications for lunar petrogenesis

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91q.239n&link_type=abstract

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

Astronomy and Astrophysics

Astronomy

1

Hafnium, Ilmenite, Lunar Rocks, Rare Earth Elements, Zirconium, Astronomical Models, Basalt, Lunar Geology, Lunar Maria

Scientific paper

Partition coefficients (D) between ilmenite and coexisting liquid were determined under near-lunar conditions for Hf, Zr, and REE. Through isotope dilution analysis, ilmenite D values of 0.41 and 0.33 were obtained for Hf and Zr respectively, values significantly lower than those of ilmenite from a kimberlite megacryst. Partition coefficients of REE for the synthesized ilmenite are slightly smaller than those of ilmenite from the kimberlite megacryst, and the lunar (Lu) partition coefficient is 0.056. These results suggest that ilmenite was significant in the lunar-Hf evolution of lunar mare basalts. Using lunar and Hf D values for ilmenite, the Lu-Hf evolution of lunar cumulates and the coexisting magma was examined for various crystallization sequences. The Lu-Hf variation trend of most high-Ti mare basalts is explained by a small degree of partial cumulate melting, though a higher degree is required to explain the variation of very low-Ti basalts, green glass, and Apollo 12 low-Ti basalts. Apollo 15 low-Ti basalts may require chromite crystallization as well.

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