Chronology and petrogenesis of a 1.8 G lunar granitic clast:14321,1062

Details Chronology and petrogenesis of a 1.8 G lunar granitic clast:14321,1062 Chronology and petrogenesis of a 1.8 G lunar granitic clast:14321,1062

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..411s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, Feb. 1985, p. 411-426. NASA-supported research.

Mathematics

Logic

4

Geochronology, Granite, Lunar Rocks, Petrography, Argon Isotopes, Fractionation, Neodymium Isotopes, Rubidium Isotopes, Samarium Isotopes, Strontium Isotopes, Moon, Chronology, Petrogenesis, Clasts, Samples, Lunar, Apollo 14, 14321, Breccias, Dating Techniques, Rubidium, Strontium, Samarium, Neodymium, Argon, Isotopes, Isochrons, Ages, Models, Comparisons, Granite, History, Trace Elements, Fractionations, Rare Earth Elements, Distribution, Patterns, Crystallization, Liquids, Formation, Origin, Description,

Scientific paper

Geochronological, isotopic, and trace element data for a pristine granite clast from Apollo 14 breccia 14321 obtained using Rb-Sr, Sm-Nd, and (Ar-39)-(Ar-40) methods are presented. Trace element data for a possibly related evolved rock, the quartz-monodiorite clast from breccia 15404 are also presented, and the relationship between these two rock types is discussed. The concordancy of the Rb-Sr and Sm-Nd internal isochron ages and especially the Rb-Sr model age strongly suggest that the granite clast formed 4.1 AE ago. It probably crystallized slowly in the crust and was later excavated and brecciated about 3.88 AE ago, as indicated by the Ar-Ar age. A two-stage model involving crystal fractionation followed by silicate liquid immiscibility is proposed for the lunar granite genesis.

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