Computer Science
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..52..227c&link_type=abstract
Earth and Planetary Science Letters, vol. 52, no. 2, Feb. 1981, p. 227-238.
Computer Science
25
Lunar Crust, Lunar Evolution, Orography, Selenology, Crystallization, Lunar Mantle, Lunar Rocks, Neodymium Isotopes, Samarium Isotopes, Fractionation, Abundance, Rare Earth Elements, Moon, Highlands, Crust, Formation, History, Models, Samples, Lunar, 78236, 73255, Norite, Dating Techniques, Samarium/Neodymium, Radiometric Dating, Isochrons, Crystallization, Composition, Characteristics, Mineralogy, Analysis, Procedure, Data, Kreep, 76535, Troctolite
Scientific paper
Due to remaining uncertainties in model parameters and assumptions in the calculation of model ages, it is not yet possible to resolve the precise dating and duration of lunar crust-mantle differentiation phenomena. Norites 78236 and 73255,27,45 were examined utilizing the Sm-Nd radiometric system. The systematics of 78236 show post-crystallization disturbance but indicate a crystallization date 4.34 AE ago. An isochron is defined by the 73255,27,45 data, with a crystallization date of 4.23 AE. The initial Nd isotopic composition of both norites is within uncertainty limits for a 'chondritic' reference reservoir at the time of their respective crystallizations. The implications for lunar crustal formation persisting over a time span of nearly 350 million years are discussed.
Carlson Richard W.
Lugmair Guenter W.
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