Petrology and chemistry of two 'large' granite clasts from the moon

Details Petrology and chemistry of two 'large' granite clasts from the moon Petrology and chemistry of two 'large' granite clasts from the moon

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..175w&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 64, no. 2, Aug. 1983, p. 175-185.

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42

Granite, Lunar Composition, Lunar Rocks, Mineralogy, Petrology, Feldspars, Kreep, Photomicrography, Quartz, Moon, Petrology, Chemistry, Clasts, Samples, Lunar, Apollo 14, 14321, 14303, Mass, Mineralogy, Feldspar, Quartz, Pyroxene, Plagioclase, Ilmentite, Magnesium, Zoning, Description, Features, Composition, Comparisons, Granites, Kreep, Rare Earth Elements, Abundance

Scientific paper

Pristine granite clasts in Apollo-14 breccias 14321 and 14303 have estimated masses of 1.8 and 0.17 g, respectively. The 14321 clast is about 60 percent K-feldspar and 40 percent quartz, with traces of extremely Mg-poor mafic silicates and ilmenite. The 14303 clast is roughly 33 percent plagioclase, 32 percent K-feldspar, 23 percent quartz, 11 percent pyroxene, and 1 percent ilmenite; pyroxene and ilmenite are moderately Mg-rich; plagioclase and pyroxene are strongly zoned. Both clasts are severely brecciated, but monomict (pristine). Both have abundant graphic integrowths of K-feldspar with quartz. Unlike the majority of similar earth rocks, both clasts are devoid of hydrous phases. The bulk composition of the 14321 clast is similar to those of several other lunar granitic samples, but the 14303 clast is unique: it bears as close a resemblance to KREEP as it does to other lunar granites. Silicate liquid immiscibility may explain why the granites are low in REE relative to KREEP.

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