U-Th-Pb systematics of the eucrite 'Juvinas' - Precise age determination and evidence for exotic lead

Details U-Th-Pb systematics of the eucrite 'Juvinas' - Precise age determination and evidence for exotic lead U-Th-Pb systematics of the eucrite 'Juvinas' - Precise age determination and evidence for exotic lead

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2247m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, Nov. 1984, p. 2247-2264.

Computer Science

24

Breccia, Meteoritic Composition, Radioactive Age Determination, Radioactive Isotopes, Impact Damage, Lead Isotopes, Thorium Isotopes, Uranium Isotopes

Scientific paper

The U-Th-Pb isotope systematics of the eucrite 'Juvinas' have been studied in whole rock fragments as well as in plagioclases and pyroxenes. The results show that this monomict breccia crystallized with a very high U/Pb initial ratio at T = 4.539 + or - 0.004 AE ago. There is evidence for a less radiogenic Pb component (Pb-206/Pb-204 = 13.0; Pb-207/Pb-204 = 13.5; Pb-208/Pb-204 = 32.71) interpreted as 'exotic lead' induced by a meteoritical impact at the surface of the Juvinas parent body, 1.92 + or - 0.06 AE ago.

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