Ion microprobe U-Th-Pb dating and REE analyses of phosphates in nakhlites: Lafayette and Yamato-000593/000749

Details Ion microprobe U-Th-Pb dating and REE analyses of phosphates in nakhlites: Lafayette and Yamato-000593/000749 Ion microprobe U-Th-Pb dating and REE analyses of phosphates in nakhlites: Lafayette and Yamato-000593/000749

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004m%26ps...39.2033t&link_type=abstract

Meteoritics & Planetary Science, Vol. 39, No. 12, p.2033-2041

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9

Scientific paper

U, Th, and Pb isotopes and rare earth elements (REEs) in individual phosphate grains from martian meteorites, Lafayette and Yamato-000593/000749, were measured using a sensitive high- resolution ion microprobe (SHRIMP). Observed U-Pb data of 12 apatite grains from Yamato-000593/ 000749 are well represented by linear regressions in both "conventional" 2D isochron plots and the 3D U-Pb plot (total Pb/U isochron), indicating that the formation age of this meteorite is 1.53 +/- 0.46 Ga (2?). However, the data of nine apatite grains from Lafayette are well represented by planar regression rather than linear regression, indicating that its formation age is 1.15 +/- 0.34 Ga (2?) and that a secondary alteration process slightly disturbed its U-Pb systematics as discussed in the literature regarding Nakhla. The observed REE abundance patterns of the apatites in Lafayette and Yamato-000749, normalized to CI chondrites, are characterized by a progressive depletion of HREEs, a negative Eu anomaly, similarity to each other, and consistency with previously reported data for Nakhla. Considering the extensive data from other radiometric systems such as Sm-Nd, Rb-Sr, Ar-Ar, and trace elements, our results suggest that the parent magmas of the nakhlites, including the newly found Yamato-000593/000749, are similar, and that their crystallization ages are ~1.3 Ga.

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