The formation and evolution of the Moon’s crust inferred from the Sm-Nd isotopic systematics of highlands rocks

Borg, Lars E.; Cassata, William S.; Wimpenny, Josh; Gaffney, Amy M.; Shearer, Charles K.

doi:10.1016/j.gca.2020.09.013

The formation and evolution of the Moon’s crust inferred from the Sm-Nd isotopic systematics of highlands rocks

Journal Article · Sat Sep 19 00:00:00 EDT 2020 · Geochimica et Cosmochimica Acta

DOI:https://doi.org/10.1016/j.gca.2020.09.013· OSTI ID:1771024

^[1]; Cassata, William S. ^[1]; Wimpenny, Josh ^[1]; Gaffney, Amy M. ^[1]; Shearer, Charles K. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of New Mexico, Albuquerque, NM (United States)

Ages determined for magnesian and ferroan anorthosite crustal rock suites overlap, suggesting they formed contemporaneously about 4.3–4.5 Ga. A notable exception is the Sm-Nd age previously determined on Mg-suite gabbronorite 67667 which is at least 100 Ma younger than the youngest ferroan anorthosite. New chronologic measurements of 67667 presented here yield concordant Sm-Nd and Rb-Sr mineral isochron ages of 4349 ± 31 Ma and 4368 ± 67 Ma, suggesting the sample is older than previous estimates. Furthermore, a whole rock Sm-Nd isochron of Mg-suite rocks from the Apollo 14, 15, 16, and 17 landing sites yields an age of 4348 ± 25 Ma, indicating that Mg-suite magmatism was widespread and roughly contemporaneous on the lunar nearside. Here, analysis of Sm-Nd internal isochron ages confirms that Mg-suite magmatism was restricted to a period between about 4.33 and 4.35 Ga at the Apollo 14, 15, 16, and 17 landing sites and was synchronous with magmatism at the Apollo 16 site associated with the ferroan anorthosite suite between 4.35 and 4.37 Ga. Magnesian- and ferroan anorthosite suite rocks with ages younger than ~4.33 Ga appear to have experienced slow cooling in the deep lunar interior, so that the ages record when the samples cooled below the closure temperature of the Sm-Nd isotopic system and not the time they crystallized.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: NASA Emerging Worlds Program; USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1771024

Alternate ID(s):: OSTI ID: 1810920
OSTI ID: 1771028

Report Number(s):: LLNL-JRNL--810106; LLNL-JRNL--813629; 1016585

Journal Information:: Geochimica et Cosmochimica Acta, Journal Name: Geochimica et Cosmochimica Acta Journal Issue: na Vol. 290; ISSN 0016-7037

Publisher:: Elsevier; The Geochemical Society; The Meteoritical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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