Al-rich chondrules from the Ybbsitz H4-chondrite - Evidence for formation by collision and splashing

Details Al-rich chondrules from the Ybbsitz H4-chondrite - Evidence for formation by collision and splashing Al-rich chondrules from the Ybbsitz H4-chondrite - Evidence for formation by collision and splashing

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..170b&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 93, no. 2, June 1989, p. 170-180. Research supported by DFG.

Mathematics

Logic

20

Aluminum, Chondrule, Inclusions, Meteoritic Composition, Mineralogy, Chondrites, Collision Parameters, Crystal Structure, Olivine, Petrology, Meteorites, Aluminum, Chondrules, Ybbsitz, H4 Chondrites, Formation, Collisions, Origin, Samples, Meteorite, Laboratory Studies, Chemistry, Mineralogy, Crystallization, Composition, Europium, Procedure, Petrology, Photomicrographs, Neutron Activation Analysis, Metamorphism, Hypotheses, Inaa

Scientific paper

A chemical and mineralogical study of three Al-rich chondrules from the H4-chondrite Ybbsitz is presented. These chondrules are found to have a high concentration of incompatible elements, to be fractionated, and to be enriched in light rare earths. The results indicate that the Al-rich Ybbsitz chondrules formed by different processes than the Ca-Al-rich inclusions from carbonaceous chondrites. A model is proposed in which partly molten ferromagnesian chondrules collided with other objects, and Al-melt fractions were ejected to form independent Al-rich chondrules. It is suggested that the strong positive Eu anomaly noted may be due to diffusive exchange of Eu between the matrix and the Al-rich chondrules.

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