INWARD RADIAL MIXING OF INTERSTELLAR WATER ICES IN THE SOLAR PROTOPLANETARY DISKReportar como inadecuado




INWARD RADIAL MIXING OF INTERSTELLAR WATER ICES IN THE SOLAR PROTOPLANETARY DISK - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 CRPG - Centre de Recherches Pétrographiques et Géochimiques 2 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie 3 IUF - Institut Universitaire de France

Abstract : The very wide diversity of asteroid compositions in the main belt suggests significant material transport in the solarprotoplanetary disk and hints at the presence of interstellar ices in hydrated bodies. However, only a fewquantitative estimations of the contribution of interstellar ice in the inner solar system have been reported, leadingto considerable uncertainty about the extent of radial inward mixing in the solar protoplanetary disk 4.56 Ga ago.We show that the pristine CM chondrite Paris contains primary Ca-carbonates whose O-isotopic compositionsrequire an 8%–35% contribution from interstellar water. The presence of interstellar water in Paris is confirmed byits bulk D-H isotopic composition that shows significant D enrichment D-H = 167 ± 0.2 × 10−6 relative tothe mean D-H of CM chondrites 145 ± 3 × 10−6 and the putative D-H of local CM water82 ± 1.5 × 10−6. These results imply that i efficient radial mixing of interstellar ices occurred from theouter zone of the solar protoplanetary disk inward and that ii chondrites accreted water ice grains from increasingheliocentric distances in the solar protoplanetary disk.

Keywords : meteorites meteors meteoroids – minor planets asteroids: general – protoplanetary disks





Autor: Lionel G. Vacher - Yves Marrocchi - Maximilien J. Verdier-Paoletti - Johan Villeneuve - Matthieu Gounelle -

Fuente: https://hal.archives-ouvertes.fr/



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