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chondritic unfractionated reservoir


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(CHUR)

Undifferentiated material from which chondrites are believed to have formed and in which elemental abundances are essentially the same as those in the solar atmosphere (see meteoritic abundance of elements; and solar abundance of elements). CHUR therefore provides a starting point for discussion of the chemical (and in particular the isotopic) evolution of the solar system.

Subjects: Earth Sciences and Geography.


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