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Pb-Pb ages of feldspathic clasts in two Apollo 14 breccia samples
Curtin University.
University of Western Australia.
Swedish Museum of Natural History, Department of Geology. (Early Planetary Evolution)
Curtin University.
Show others and affiliations
2017 (English)In: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 217, 441-461 p.Article in journal (Refereed) In press
Abstract [en]

Pb-Pb isochron ages of ca. 3.92 Ga for three K-feldspar-rich clasts from Apollo 14 breccias 14303 and 14083 were determinedusing Secondary Ion Mass Spectrometry (SIMS). These ages are interpreted to represent the resetting of the U-Pb systemin the clasts as a result of brecciation during the Imbrium impact. One of the clasts contains zircon grains that record asignificantly older crystallization age (ca. 4.33–4.35 Ga) for the rock represented by that clast. Initial Pb compositions determinedfor the clasts, combined with the previously measured Pb isotopic compositions of K-feldspar grains from severalApollo 14 breccia samples, constrain a range of initial Pb compositions in the ca. 3.9 Ga Fra Mauro formation at the Apollo14 landing site. This range in initial Pb compositions indicates that the rocks represented by these clasts, or the sources ofthose rocks, evolved with a high 238U/204Pb (µ-value) for substantial periods of time, although the precise crystallization agesof the rocks represented by at least two of the clasts investigated here are unknown.

Place, publisher, year, edition, pages
2017. Vol. 217, 441-461 p.
Keyword [en]
Lunar breccia, Age, Pb-isotopes, Imbrium
National Category
Geology Astronomy, Astrophysics and Cosmology Geochemistry
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-1408DOI: 10.1016/j.gca.2017.08.024OAI: oai:DiVA.org:nrm-1408DiVA: diva2:1161628
Funder
Knut and Alice Wallenberg Foundation, 2012.0097Swedish Research Council, VR 621-2012-4370
Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2017-12-01Bibliographically approved

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Publisher's full texthttp://dx.doi.org/10.1016/j.gca.2017.08.024

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