Abstract
New high-precision 53Mn-53Cr data obtained for chondrules extracted from a primitive ordinary chondrite, Chainpur (LL3.4), define an initial 53Mn/55 Mn ratio of (5.1 ± 1.6) × 10-6. As a result of this downward revision from an earlier higher value of (9.4 ± 1.7) × 10-6 for the same meteorite (Nyquist et al. 2001), together with an assessment of recent literature, we show that a consistent chronology with other chronometers such as the 26Al-26Mg and 207Pb-206Pb systems emerges in the early solar system.
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