Refining the granulite suite

Details Refining the granulite suite Refining the granulite suite

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ga17.conf....4t&link_type=abstract

In Lunar Science Inst., Workshop on Geology of the Apollo 17 Landing Site p 4-5 (SEE N93-18786 06-91)

Physics

Breccia, Feldspars, Lithology, Lunar Geology, Lunar Rocks, Olivine, Petrography, Pyroxenes, Apollo 17 Flight, Landing Sites, Lunar Landing, Minerals, Textures

Scientific paper

Early studies of rocks retrieved from the Moon during the Apollo missions defined a group of rocks as granulites or 'granulitic impactites'. This included rocks with cataclastic, granulitic, and poikilitic or poikiloblastic textures. Petrographic studies indicate that the textures of 'granulitic breccias' are significantly varied so as to redefine the granulitic suite into at least two distinct groups. The first group consists of rocks that have true granulitic textures: polygonal to rounded, equant grains that are annealed, and have triple junctions with small dispersions from the average 120 degrees. The second group of rocks have poikilitic or poikiloblastic textures, with subhedral to euhedral plagioclase and/or olivine grains enclosed in pyroxene oikocrysts. In some instances, the relationship between the minerals resembles an orthocumulate texture. Rocks previously thought of as granulites may have formed in more than one way. These formation mechanisms are briefly discussed.

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