Other
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1347s&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 347.
Other
Basalt, Apollo 15 Flight, Geochronology, Neodymium Isotopes, Strontium Isotopes, Hafnium Isotopes, Olivine, Samarium Isotopes, Quartz, Pyroxenes
Scientific paper
We have analyzed the Nd, Sr, and Hf isotopic composition of a set of mare basalts from the Apollo 15 collection to elucidate their ages and sources. Olivine-normative basalt 15016 appears to have an initial Hf-176/Hf-177 that is unique to other Apollo 15 basalts. Quartz-normative basalt 15475 yields a 4-point Rb-Sr age of 3.43 +/- 0.15 Ga, a 3-point Sm-Nd age of 3.37+/- 0.05 Ga, and initial Sr and Nd isotopic ratios similar to other quartz-normative basalts from the Apollo 15 collection, indicative of similar origins. Mineral separates and mechanical splits of picritic basalt 15385 do not yield a well-defined Sm-Nd age, but the data could be interpreted as defining an age of 3.54 +/- 0.22 Ga. The initial Hf isotopic composition of this rock is similar to other that of Apollo 15 basalts. This picritic basalt is best explained as an olivine-normative basalt with approximately 30 percent accumulated olivine.
Borg Lars E.
Halliday Alex N.
Lee Der-Chuen
Nyquist Larry E.
Snyder Glenn A.
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