Re-Os Ages of Group IIA, IIIA, IVA, and IVB Iron Meteorites
Abstract
Rhenium and osmium concentrations and osmium isotopic ratios of group IIA, IIIA, IVA, and IVB iron meteorites were determined by negative thermal ionization mass spectrometry with modified digestion and equilibration techniques. Precise isochrons are defined for all four groups. An absolute age of 4558 million years is assumed for group IIIA irons, leading to closure ages of 4537 ± 8, 4456 ± 25, and 4527 ± 29 million years for the group IIA,...
Paper Details
Title
Re-Os Ages of Group IIA, IIIA, IVA, and IVB Iron Meteorites
Published Date
Feb 23, 1996
Journal
Volume
271
Issue
5252
Pages
1099 - 1102
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