The chemical composition and homogeneity of the Allende matrix

Neuland, M.B.; Mezger, K.; Riedo, A.; Tulej, M.; Wurz, P. (2021). The chemical composition and homogeneity of the Allende matrix. Planetary and space science, 204, p. 105251. Elsevier 10.1016/j.pss.2021.105251

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The abundances of C, O, S, Na, K, Li, Mn, P, Cr, Si, Fe, Mg, Ni, Co, V, Ca, Ti, Al and Sc were determined in-situ in asample of the Allende meteorite using a laser ablation/ionization mass spectrometer to quantify the bulk chemicalcomposition of the matrix and its spatial chemical variability.The high lateral resolution of the instrument makes it possible to measure the elemental composition of Allendematrix, without any sample treatment prior to analysis. The measurements of solely Allende matrix allowinvestigating the variability of the element abundances in the matrix material on different scales from 50μmto0.5 mm.The comprehensive data set provides constraints on models for the formation of matrix material of carbona-ceous chondrites in the solar nebula. A key observation of this study is a high degree of chemical homogeneity ofthe matrix, indicating that it formed independently from or in parallel with the chondrules and that the processthat led to the formation of the parent body was a fast collapse of the dust-gas cloud following chondruleformation.

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