Ion microprobe U-Pb dating of phosphates in lunar basaltic breccia, Elephant Moraine 87521

Details Ion microprobe U-Pb dating of phosphates in lunar basaltic breccia, Elephant Moraine 87521 Ion microprobe U-Pb dating of phosphates in lunar basaltic breccia, Elephant Moraine 87521

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3220202t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 20, CiteID L20202

Mathematics

Logic

6

Geochemistry: Composition Of The Moon, Geochemistry: Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), Geochronology: Radioisotope Geochronology, Geochronology: Planetary And Lunar Geochronology, Planetary Sciences: Solar System Objects: Moon (1221)

Scientific paper

We report ion microprobe U-Pb dating of phosphates in lunar meteorite ``Elephant Moraine 87521 (EET87521),'' which is a fragmental breccia consisting of Very-Low Ti (VLT) basaltic clasts and a small component of highland-derived materials. The observed Pb-Pb age of phosphates in EET87521 is 3503 +/- 140 Ma, which is distinct from the results from previous chronological studies on VLT mare basalt of 3.2-3.3 Ga for LUNA-24. This suggests that the VLT basalt volcanism appears to have been prolonged on the Moon. Moreover, the age is apparently different from those of other VLT meteorites (3.8 Ga for QUE94281 and 4.0 & 4.4 Ga for Yamato793274), which are proposed to have been launched by a single impact event based on the similarity of launching ages, mineralogical and geochemical signatures. This evidence questions the validities of bulk age analyses for the Yamato & QUE meteorites in the literature and/or the hypothesis of a single-crater origin.

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