Abstract
Abstract— A carbon‐rich residue from Allende subjected to stepwise heating yielded two isotopically resolvable types of Hg: one with a 196Hg/202Hg concentration ratio the same as terrestrial (monitor) Hg; the other enriched in 196Hg relative to 202Hg by ∼60%. Hg with the 202 isotope enriched relative to 196, as is found in bulk Allende, was not observed. Whether the result of mass fractionation or nucleosynthesis, the distinct types of Hg entered different carrier phases and were not thermally mobilized since the accretion of the Allende parent body.
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