Sm-Nd systematics of lunar ferroan anorthositic suite rocks: Constraints on lunar crust

Boyet, Maud; Carlson, Richard W.; Borg, Lars E.; Horan, Mary

doi:10.1016/j.gca.2014.09.021

Sm-Nd systematics of lunar ferroan anorthositic suite rocks: Constraints on lunar crust

Journal Article · Sun Sep 28 00:00:00 EDT 2014 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2014.09.021· OSTI ID:1249127

Boyet, Maud ^[1]; Carlson, Richard W. ^[2]; Borg, Lars E. ^[3]; Horan, Mary ^[2]

Clermont Univ., Univ. Blaise Pascal, Clermont-Ferrand (France)
Dept. of Terrestrial Magnetism, Washington, DC (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, we have measured Sm–Nd systematics, including the short-lived ¹⁴⁶Sm–¹⁴²Nd chronometer, in lunar ferroan anorthositic suite (FAS) whole rocks (15415, 62236, 62255, 65315, 60025). At least some members of the suite are thought to be primary crystallization products formed by plagioclase flotation during crystallization of the lunar magma ocean (LMO). Most of these samples, except 62236, have not been exposed to galactic cosmic rays for a long period and thus require minimal correction to their ¹⁴²Nd isotope composition. These samples all have measured deficits in ¹⁴²Nd relative to the JNdi-1 terrestrial standard in the range –45 to –21 ppm. The range is –45 to –15 ppm once the 62236 ¹⁴²Nd/¹⁴⁴Nd ratio is corrected from neutron-capture effects. Analyzed FAS samples do not define a single isochron in either ¹⁴⁶Sm–¹⁴²Nd or ¹⁴⁷Sm–¹⁴³Nd systematics, suggesting that they either do not have the same crystallization age, come from different sources, or have suffered isotopic disturbance. Because the age is not known for some samples, we explore the implications of their initial isotopic compositions for crystallization ages in the first 400 Ma of solar system history, a timing interval that covers all the ages determined for the ferroan anorthositic suite whole rocks as well as different estimates for the crystallization of the LMO. 62255 has the largest deficit in initial ¹⁴²Nd and does not appear to have followed the same differentiation path as the other FAS samples. The large deficit in ¹⁴²Nd of FAN 62255 may suggest a crystallization age around 60–125 Ma after the beginning of solar system accretion. This result provides essential information about the age of the giant impact forming the Moon. The initial Nd isotopic compositions of FAS samples can be matched either with a bulk-Moon with chondritic Sm/Nd ratio but enstatite-chondrite-like initial ¹⁴²Nd/¹⁴⁴Nd (e.g. 10 ppm below modern terrestrial), or a bulk-Moon with superchondritic Sm/Nd ratio and initial ¹⁴²Nd/¹⁴⁴Nd similar to ordinary chondrites.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1249127

Report Number(s):: LLNL-JRNL--656753

Journal Information:: Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Journal Issue: C Vol. 148; ISSN 0016-7037

Publisher:: The Geochemical Society; The Meteoritical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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