The timing of lunar solidification and mantle overturn recorded in ferroan anorthosite 62237

Sio, C. K.; Borg, L. E.; Cassata, W. S.

doi:10.1016/j.epsl.2020.116219

Title: The timing of lunar solidification and mantle overturn recorded in ferroan anorthosite 62237

Journal Article · Fri May 15 00:00:00 EDT 2020 · Earth and Planetary Science Letters

DOI:https://doi.org/10.1016/j.epsl.2020.116219· OSTI ID:1617275

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^[1]; Cassata, W. S. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Ferroan anorthosite suite (FAS) rocks are widely interpreted to represent primordial lunar crust. Despite their importance in pinpointing the timing of lunar crust formation, robust chronological investigations for this rock type are scarce. Here, we report the Ar-Ar, Rb-Sr, and Sm-Nd isotopic systematics for the FAS troctolitic anorthosite 62237. The Ar-Ar isotopic system has been reset by a thermal event at 3710 ± 48 Ma, and the Rb-Sr isotopic systematics has been disturbed such that a Rb-Sr isochron age cannot be determined. However, an internal isochron for the Sm-Nd isotopic system has yielded an age of 4350 ± 73 Ma (MSWD = 2.0) with an initial ε¹⁴³Nd_CHUR of -0.53 ± 0.26. The mineral and whole-rock fractions of 62237 plot on the same internal isochron as FAS sample 60025. The combined datasets define an age of 4372 ± 35 Ma (MSWD = 4.0) with an initial ε¹⁴³Nd_CHUR of -0.17 ± 0.22. Literature Sm-Nd data for FAS and Mg-suite whole-rocks also plot on the 60025-62237 isochron. The coherence of data from both FAS and Mg-suite rocks examined thus far suggests that both rock suites formed contemporaneously from identical, or nearly identical, sources. In addition, the concordance of FAS and Mg-suite ages suggests that primordial crust solidification either involved both magmatic suites, or that Mg-suite magmatism was contemporaneous with FAS magmatism within resolution of the Sm-Nd chronometer. The ages for FAS and Mg-suite also coincide with the formation ages of the mare basalt source regions and urKREEP. Ferroan anorthosite suite rocks and urKREEP are thought to represent primordial LMO solidification products, whereas Mg-suite and the mare basalt source regions are argued to represent mixtures of various LMO crystallization products that were formed during density-driven overturn of the LMO. The concordance of ages implies that the 4372 ± 35 Ma Sm-Nd isochron records the age of mantle overturn, and that overturn occurred during, or shortly after, solidification of the LMO.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; 17-ERD-001

OSTI ID:: 1617275

Alternate ID(s):: OSTI ID: 1606291

Report Number(s):: LLNL-JRNL-790599; 989211

Journal Information:: Earth and Planetary Science Letters, Vol. 538, Issue C; ISSN 0012-821X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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58 GEOSCIENCES
lunar magma ocean
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Title: The timing of lunar solidification and mantle overturn recorded in ferroan anorthosite 62237

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