Mathematics – Logic
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15...63j&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Mathematics
Logic
12
Breccia, Geochemistry, Lunar Composition, Lunar Craters, Lunar Rocks, Petrology, Aluminum Oxides, Apollo 16 Flight, Basalt, Electron Probes, Glass, Microstructure, Moon, Samples, Lunar, Petrology, Geochemistry, Dimict, Breccia, 61015, Apollo 16, Anorthosite, Impacts, Melt, Vha Basalt, Composition, Source, Comparisons, Formation, Chronology, Models, Fragmentation, Deformation, Shock Effects, Glasses, Titanium Dioxide, Mafic
Scientific paper
The results of a petrological and geochemical study of the dimict breccia 61015 at the Apollo 16 site are presented and discussed. The breccia consists predominantly of granulated anorthosite and impact melt rock of very high aluminum-basalt composition. It probably formed in the floor of an expanding crater cavity when impact melt generated within the cavity was injected into underlying anorthositic bedrock and solidified rapidly, the anorthosite and melt rock being fragmented by deformation in the later stages of the impact. A possible source crater for the breccia is identified. The breccia has been affected by at least one recent small impact, which produced internal shock-induced melting of the breccia and injected and coated the rock with externally derived melts. The TiO2 content of the coating and vein glasses establish that they cannot be melted soils; their composition requires a mafic, low-TiO2 protolith component.
Flohr Marta K.
James Odette B.
Lindström Markus
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