Apollo 15 low-Ti and KREEP basalts: two distinct "water" reservoirs?

Tartèse, R.; Anand, M.; Barnes, Jessica and Franchi, I. A. (2012). Apollo 15 low-Ti and KREEP basalts: two distinct "water" reservoirs? In: European Planetary Science Congress, 23-28 Sep 2012, Madrid, Spain.

URL: http://meetingorganizer.copernicus.org/EPSC2012/EP...

Abstract

Apatites in low-Ti mare basalts from the Apollo 15 landing site display a large range of OH content from about 100 ppm up to ~ 2000 ppm. The D/H ratios measured in these apatites yielded δD values of ~ 550-1050 ‰. On the other hand, apatites in the KREEP basalt 15386 have less than 250 ppm OH and yielded δD values in the range ~ 20-500 ‰. These data suggests that the source of KREEP basalts was much drier than the mare basalt mantle sources, implying a late addition of H-bearing species into the mare source regions.

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