A unifying model for the accretion of chondrules and matrix

• DOI: 10.1073/pnas.1907592116
• Publication Date: 2019-09-04T22:55:22Z
• Authors: Elishevah M. M. E...; Frédéric Moynier; Arnaud Agranier
• Keywords: Chondrule; Volatiles

The so far unique role of our Solar System in the universe regarding its capacity for life raises fundamental questions about formation history relative to exoplanetary systems. Central this research is accretion asteroids and planets from a gas-rich circumstellar disk final distribution their mass around Sun. key building blocks may be represented by chondrules, main constituents chondritic meteorites, which turn are primitive fragments planetary bodies. Chondrule mechanisms, as well subsequent storage transport disk, still poorly understood, origin evolution can probed through link (i.e., complementary or noncomplementary) fine-grained dust (matrix) that accreted together with chondrules. Here, we investigate apparent chondrule–matrix complementarity analyzing major, minor, trace element compositions chondrules matrix altered relatively unaltered CV, CM, CR (Vigarano-type, Mighei-type, Renazzo-type) chondrites. We show matrices most CM CV chondrites overall CI-like (Ivuna-type) (similar solar composition) do not reflect any volatile enrichment elemental patterns exception being Fe/Mg ratios. propose unify these contradictory data invoking chondrule model so-called armored ubiquitous many Metal rims expelled during formation, but attached host chondrule, interacted matrix, thereby enriching siderophile elements generating an complementarity.