Rb-Sr isotopic study of Yamato-794046 chondrite and its inclusion

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The Yamato-794046 H chondrite and its inclusion were dated by the Rb-Sr method as part of a consortium study of unique inclusions in ordinary chondrites. Although the inclusion recorded an approximate 3.9 Ga-melting event, the age of the impact event of the host chondrite was unclear. The inclusion is not depleted in volatile elements such as Rb and the alkalis, even though the host is depleted. Therefore, when they were impacted, they should have been in different places. The host might have been impacted under low confining pressures, and the inclusion, in contrast, was melted under relatively high confining pressures.
国立極地研究所の論文