Chemistry and petrology of the Apennine Front, Apollo 15. I - KREEP basalts and plutonic rocks. II - Impact melt rocksThe mineralogy, petrology, and chemistry of rock fragments for the Apennine Front coarse fines (10-4 and 4-2 mm) have been determined. The data are consistent with a single eruptive event that produced several flows. It is found that most of the plutonic rocks are ferroan in nature, with a few belonging to the Mg-suite. The mineral and bulk chemistry of KREEP basalts and the composition of ferroan anorthosites are discussed. Petrographic studies of 21 impact melts are also presented, showing a variety of textures. It is found that the Apollo 15 impact melts are mixtures of low-K Fra Mauro, KREEP, and plutonic components. The Ni/Ir ratios of the melt rocks are shown to be greater than chondritic values, indicating ancient and/or iron meteorite components.
Document ID
19890023493
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Simon, S. B. (South Dakota School of Mines and Technology Rapid City, SD, United States)
Papike, J. J. (South Dakota School of Mines and Technology Rapid City, United States)
Laul, J. C. (Battelle Pacific Northwest Laboratories Richland, WA, United States)