The astrophysical context of collision processes in meteorites - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Meteoritics and Planetary Science Année : 2021

The astrophysical context of collision processes in meteorites

Résumé

Chondrites are leftover solids from the early evolution of the solar protoplanetary disk that never experienced melting since their formation. They comprise unequilibrated assemblages of low-and high-temperature components, including volatile-rich, fine-grained matrices, Fe-Ni metal, sulfides, refractory inclusions, and chondrules. Consequently, chondrites are commonly described as pristine, primitive, or primordial rocks of the solar system. However, impact-generated secondary features are abundant in chondrites, suggesting that collisions among early-formed planetesimals and their fragmentation and reassembly have been effective throughout the evolution of the solar system. In this report, we review evidence of the major role of impacts in generating the current mineralogical and petrographic characteristics of chondrites. We provide perspective to these meteoritic features by discussing recent analyses of large-scale structures of the main asteroid belt and remotesensing observations of asteroids. Observations at various spatial scales all attest that the 'primitive' materials formed during the evolution of the solar system have largely been 2 reprocessed, confirming previous studies that primitivity is relative, not absolute. This implies that (i) chondrites (and some differentiated meteorites) should systematically be envisioned as reprocessed and heterogeneous materials and (ii) brecciated meteorites should be considered the norm and unbrecciated meteorites the exception.
Fichier principal
Vignette du fichier
Marrocchi-modified.pdf (1.23 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03368924 , version 1 (07-10-2021)

Identifiants

Citer

Yves Marrocchi, Marco Delbo, Matthieu Gounelle. The astrophysical context of collision processes in meteorites. Meteoritics and Planetary Science, 2021, 56 (7), pp.1406-1421. ⟨10.1111/MAPS.13716⟩. ⟨hal-03368924⟩
28 Consultations
105 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More