Chondrule Matrix Isotope Complementarity
Channel: Dominik Hezel
Date: 2020-03-20

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Variations in the 183/184W ratio represent nucleosynthetic anomalies, i.e., variable additions of presolar material. Bulk planetary materials have identical 183/184W compositions. However, chondrules and matrix in CV chondrites have different 183/184W compositions. As chondrules and matrix are the major components, their combined 183/184W composition will likely represent the bulk CV 183/184W composition. The bulk CV composition has the planetary 183/184W composition, i.e., plots exactly on the intercept of the chondrule-matrix mixing line and the planetary 183/184W line. The most simple explanation for this is that chondrules formed from the same isotopic reservoir, which had the planetary 183/184W. Each component then incorporated variable amounts of 183/184W during component formation via variable addition of presolar carriers. Alternatively, it appears unlikely that chondrules and matrix formed in two isotopically different reservoirs and were subsequently mixed together in the right proportions to end up with the 183/184W. Thereby, the isotope complementarity extends the chondrule-matrix complementarity observed for many elements in various chondrites.