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Lunar basalt chronology, mantle differentiation and implications for determining the age of the Moon
Swedish Museum of Natural History, Department of Geology. (Early Planetary Evolution)
Curtin University.
Swedish Museum of Natural History, Department of Geology. (Early Planetary Evolution)
Swedish Museum of Natural History, Department of Geology. (Early Planetary Evolution)
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2016 (English)In: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 451, 149-158 p.Article in journal (Refereed) Published
Abstract [en]

Despite more than 40 years of studying Apollo samples, the age and early evolution of the Moon remain contentious. Following the formation of the Moon in the aftermath of a giant impact, the resulting Lunar Magma Ocean (LMO) is predicted to have generated major geochemically distinct silicate reservoirs, including the sources of lunar basalts. Samples of these basalts, therefore, provide a unique opportunity to characterize these reservoirs. However, the precise timing and extent of geochemical fractionation is poorly constrained, not least due to the difficulty in determining accurate ages and initial Pb isotopic compositions of lunar basalts. Application of an in situion microprobe approach to Pb isotope analysis has allowed us to obtain precise crystallization ages from six lunar basalts, typically with an uncertainty of about ±10Ma, as well as constrain their initial Pb-isotopic compositions. This has enabled construction of a two-stage model for the Pb-isotopic evolution of lunar silicate reservoirs, which necessitates the prolonged existence of high-μreservoirs in order to explain the very radiogenic compositions of the samples. Further, once firm constraints on U and Pb partitioning behaviour are established, this model has the potential to help distinguish between conflicting estimates for the age of the Moon. Nonetheless, we are able to constrain the timing of a lunar mantle reservoir differentiation event at 4376 ±18Ma, which is consistent with that derived from the Sm–Nd and Lu–Hf isotopic systems, and is interpreted as an average estimate of the time at which the high-μurKREEP reservoir was established and the Ferroan Anorthosite (FAN) suite was formed.

Place, publisher, year, edition, pages
2016. Vol. 451, 149-158 p.
Keyword [en]
Moon, lunar basalt, lunar formation
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-1874DOI: 10.1016/j.epsl.2016.07.026OAI: oai:DiVA.org:nrm-1874DiVA: diva2:1043890
Funder
Knut and Alice Wallenberg Foundation, 2012.0097Swedish Research Council, VR 621-2012-4370
Available from: 2016-11-01 Created: 2016-11-01 Last updated: 2016-11-01Bibliographically approved

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Snape et al. (2016) Lunar basalt ages(2243 kB)24 downloads
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Publisher's full texthttp://dx.doi.org/10.1016/j.epsl.2016.07.026

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Snape, JoshuaBellucci, JeremyWhitehouse, Martin
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