Subophitic lithologies in KREEP-rich poikilitic impact melt rocks from Cayley Plains, Apollo 16 - Remnants of a volcanic Highland crust?

Details Subophitic lithologies in KREEP-rich poikilitic impact melt rocks from Cayley Plains, Apollo 16 - Remnants of a volcanic Highland crust? Subophitic lithologies in KREEP-rich poikilitic impact melt rocks from Cayley Plains, Apollo 16 - Remnants of a volcanic Highland crust?

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..67....9r&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 67, no. 1, Jan. 1984, p. 9-18.

Computer Science

5

Impact Melts, Lithology, Lunar Rocks, Petrology, Apollo 16 Flight, Electron Microscopy, Kreep, Lunar Crust, Textures, Moon, Lithology, Kreep, Impact Melts, Rocks, Cayley Plains, Highlands, Apollo 16, Samples, Lunar, Volcanism, Source, Origin, Crust, Plains, 65777, 65015, 62235, Texture, Chemistry, Mineralogy, Composition, Electron Microprobe, Inclusion, Kreep, Formation, Ejecta

Scientific paper

Attention is given to the three KREEP-rich poikilitic impact melt rocks from the Cayley Plains stations of Apollo 16 with subophitic texture areas. The bulk chemistry of these areas and the surrounding poikilitic matrices, as well as mineral compositions, were determined by electron microprobe analysis, and all subophitic areas have been identified as impact melt rock clasts. The absence of pristine volcanic target rock fragments and the existence of KREEP-rich and anorthositic impact melt clasts in KREEP-rich impact melt rocks from Cayley Plains supports the theory that the Plains formation is part of the ejecta blanket from a large, basin-type impact crater which is underlain by anorthositic material and has been reworked by local impacts in post-Imbrian times.

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