A Petrologic and Oxygen Isotopic Study of Six Allende Dark Inclusions: Evaluation of Nebular vs. Asteroidal Models for Their Origin

Details A Petrologic and Oxygen Isotopic Study of Six Allende Dark Inclusions: Evaluation of Nebular vs. Asteroidal Models for Their Origin A Petrologic and Oxygen Isotopic Study of Six Allende Dark Inclusions: Evaluation of Nebular vs. Asteroidal Models for Their Origin

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1407w&link_type=abstract

Lunar and Planetary Science, volume 27, page 1407

Mathematics

Logic

5

Chondrites, Chondrites: Cv3, Inclusions: Dark, Isotopes: Oxygen, Petrology

Scientific paper

Dark lithic inclusions (DIs) are important components in chondrites because they are records of complex events that clearly predate incorporation into their host chondrites. In CV and CR chondrites most DIs show a bulk chemical and oxygen isotopic association with their host chondrites. Allende DIs have recently sparked considerable debate as to whether their unusual characteristics represent primary aggregates of materials overprinted by metasomatic exchange in the nebula or are secondary materials which were affected by aqueous alteration and subsequent dehydration by heating after accretion. To address the broad question as to their origin and relationship to their host chondrite we carried out a petrologic and oxygen isotopic study of six newly found DIs from the Allende CV3 chondrite. We conclude that some of the characteristics of Allende DIs are difficult to explain by a process of heating/dehydration of pre-existing phyllosilicates, but are also difficult to explain entirely by a process of condensation. The issues are complex and require experimental study to help resolve some of the questions.

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