A Traveling CAIA Traveling CAI Minerals from a CAI and its prominent rim have a wide range of oxygen.

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Presentation transcript:

A Traveling CAIA Traveling CAI Minerals from a CAI and its prominent rim have a wide range of oxygen isotopic composition, suggesting formation in more than one reservoir.

Oxygen Isotopic ZoningOxygen Isotopic Zoning Melilite interior has high 16 O (low  17 O)  17 O increases (so 16 O decreases) towards the rim Spinel-rich region of Wark- Lovering rim has extremely low  17 O Most of the rim oscillates around the value of the CAI interior These data clearly indicate exposure of the CAI and its rim to environments that varied in oxygen isotopic composition Implies extensive migration throughout the solar nebula

Other Evidence for TransportOther Evidence for Transport Meteorite data and astrophysical models suggest extensive transport from the inner to outer solar nebula. Silicates in comets support the idea. The new oxygen data show transport back in towards the Sun.