U-Th-Pb systematics of individual perovskite grains from the Allende and Murchison carbonaceous chondrites

Details U-Th-Pb systematics of individual perovskite grains from the Allende and Murchison carbonaceous chondrites U-Th-Pb systematics of individual perovskite grains from the Allende and Murchison carbonaceous chondrites

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101..379i&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 101, no. 2-4, Dec. 1990, p. 379-387.

Computer Science

4

Allende Meteorite, Carbonaceous Chondrites, Grain Size, Meteoritic Composition, Meteoritic Microstructures, Murchison Meteorite, Perovskites, Lead (Metal), Thulium, Uranium

Scientific paper

Ion microprobe U-Th-Pb isotopic measurements have been made of individual perovskite grains from the Allende (CV3) and Murchison (CM2) chondrites. Several generations of perovskite were identified in polished thin sections of 'fluffy' Type A inclusions 3529,44 and 4691 from Allende of which only the largest anhedral perovskites (greater than 20 microns) were analyzed with the ion microprobe. The Allende perovskites are characterized by low U (typically less than 3 ppm, but ranging up to 12 ppm in grain 7-1 from 3529,44), and Th/U of around 4 in 3529,44 and 10 in 4691. A precise age measurement could be obtained on grain 7-1 only; the U-Pb systematics of this grain are concordant with a Pb-207/Pb-206 age of 4565 + or - 34 Ma. All analyses of the Murchison perovskites are consistent with a single formation age of 4569 + or - 26 Ma. The ages determined by ion microprobe from these perovskites show good agreement with previous age estimates of Allende refractory inclusions measured by conventional mass-spectrometric techniques. There is no evidence in the U-Pb systematics of Allende and Murchison refractory inclusions for material that substantially predates the formation of the solar system.

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