Ar-40/Ar-39 and U-Th-Pb dating of separated clasts from the Abee E4 chondrite

Details Ar-40/Ar-39 and U-Th-Pb dating of separated clasts from the Abee E4 chondrite Ar-40/Ar-39 and U-Th-Pb dating of separated clasts from the Abee E4 chondrite

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..132b&link_type=abstract

Earth and Planetary Science Letters, vol. 62, no. 1, Jan. 1983, p. 132-146.

Computer Science

8

Argon Isotopes, Breccia, Chondrites, Meteoritic Composition, Radioactive Age Determination, Thallium Isotopes, Abundance, Evolution (Development), Lead Isotopes, Mineralogy, Plateaus, Temperature, Uranium Isotopes, Meteorites, Abee Meteorite, Dating Techniques, Ages, Clasts, History, E4 Chondrites, Argon 40, Argon 39, Isotopic Ratios, Uranium, Thorium, Lead, Isochrons, Models, Comparisons, Temperature, Samples, Meteorite, Canon Diablo Meteorite, Contamination, Outgassing, Thermal Effects, Magnetic Propertie

Scientific paper

Ar-40/Ar-39 and U-Th-Pb are investigated for three clasts from the Abee (E4) enstatite chondrite, yielding Ar-40/Ar-39 plateau ages (and/or maximum ages) of 4.5 Gy, while two of the clasts give average ages of 4.4 Gy. The 4.4-4.5 Gy range does not resolve possible age differences among the clasts. The U-Th-Pb data are consistent with the interpretation that initial clast formation occurred 4.58 Gy ago, and that the clasts have since remained closed systems which have been contaminated with terrestrial Pb. The thermal history of Abee deduced from Ar data seems consistent with that deduced from magnetic data, suggesting that various Abee components experienced separate histories until brecciation no later than 4.4 Gy ago, experiencing no significant subsequent heating.

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