Ilmenite-orthopyroxene intergrowths from the moon and the Skaergaard intrusion

Details Ilmenite-orthopyroxene intergrowths from the moon and the Skaergaard intrusion Ilmenite-orthopyroxene intergrowths from the moon and the Skaergaard intrusion

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975e%26psl..26..287h&link_type=abstract

Earth and Planetary Science Letters, vol. 26, no. 3, July 1975, p. 287-291.

Physics

4

Ilmenite, Lunar Geology, Lunar Rocks, Pyroxenes, Crystal Growth, Geochemistry, Metamorphism (Geology)

Scientific paper

Myrmekitic or eutectic-like intergrowths of ilmenite and orthopyroxene, which texturally resemble intergrowths from nodules in kimberlites have been observed in lunar breccia 60016,92 and in 'Lower Zone' a of the Skaergaard intrusion. The lunar sample is similar in mineral chemistry to kimberlife occurrences, while the Skaergaard sample is not as Mg-rich. In all cases, however, there is a systematic distribution of Mg between orthopyroxene and ilmenite. The similar textures were formed by different processes: the lunar intergrowth is probably a eutectic-type texture resulting from crystallization of a melt, while the Skaergaard intergrowth formed by a process of sub-solidus oxidation.

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