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To constrain the timescales and processes involved in the crystallization and cooling of protoplanetary cores, we examined the Pd-Ag isotope systematics of the IVA iron meteorites Muonionalusta and Gibeon. A Pd-Ag isochron for Muonionalusta provides an initial 107Pd/108Pd=(2.57±0.07)×10−5. The three metal samples analyzed from Gibeon plot below the Muonionalusta isochron, but these samples also show...
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