Computer Science
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74..209h&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 74, no. 2-3, July 1985, p. 209-219. NSF-supported research.
Computer Science
5
Chondrites, Metamorphism (Geology), Meteoritic Composition, Planetary Evolution, Solar System, Allende Meteorite, Lead Isotopes, Troilite, Uranium Isotopes, Xenon Isotopes, Meteorites, Chondrites, Metamorphism, Lead, Isotopes, Samples, Meteorite, Mezo-Madaras, Sharps, L3 Chondrites, H3 Chondrites, Isotopic Ratios, Age, Dating Methods, Canyon Diablo, Uranium, Rubidium, Strontium, Comparisons, Contamination, Statistical Analysis, Metamorphism, Formation, Iodine, Xenon, Cooling, Thermal Effects, Parent Materia
Scientific paper
The record of early events in the solar system is presently sought, together with information on the isotopic composition of primordial lead, in the lead isotope relations of whole rock and separated phases of Mezo-Madaras (L3) and Sharps (H3) chondrites; the respective ages of 4.48 and 4.47 billion years are not significantly changed when Canyon Diablo troilite lead is included in the data sets, suggesting that the initial Pb isotopic composition in both meteorites was the same as that in the troilite. The 4.48 billion year age, which is younger than the well established 4.54-4.56 billion years of the Allende chondrite and Angra dos Reis achondrite, appears to date an early metamorphic event rather than the formation of the chondrites.
Hanan Barry B.
Tilton George R.
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