Magnetic classification of stony meteorites: 2. Non-ordinary chondrites - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Meteoritics and Planetary Science Année : 2008

Magnetic classification of stony meteorites: 2. Non-ordinary chondrites

Lydie Bonal
  • Fonction : Auteur
  • PersonId : 837099
Eric Quirico

Résumé

A database of magnetic susceptibility (chi) measurements on different non-ordinary chondrites (C, E, R, and ungrouped) populations is presented and compared to our previous similar work on ordinary chondrites. It provides an exhaustive study of the amount of iron-nickel magnetic phases (essentially metal and magnetite) in these meteorites. In contrast with all the other classes, CM and CV show a wide range of magnetic mineral content, with a two orders of magnitude variation of chi. Whether this is due to primary parent body differences, metamorphism or alteration, remains unclear. C3-4 and C2 yield similar chi values to the ones shown by CK and CM, respectively. By order of Increasing chi, the classes with well-grouped chi are: R << CO < CK approximate to CI < Kak < CR < E approximate to CH < CB. Based on magnetism, EH and EL classes have indistinguishable metal content. Outliers that we suggest may need to have their classifications reconsidered are Acfer 202 (CO), Elephant Moraine (EET) 96026 (C4-5), Meteorite Hills (MET) 01149, and Northwest Africa (NWA) 521 (CK), Asuka (A)-88198, LaPaz Icefield (LAP) 031156, and Sahara 98248 (R). chi values can also be used to define affinities of ungrouped chondrites, and propose pairing, particularly In the case of CM and CV meteorites.
Fichier non déposé

Dates et versions

insu-00361714 , version 1 (16-02-2009)

Identifiants

  • HAL Id : insu-00361714 , version 1

Citer

Pierre Rochette, Jérôme Gattacceca, Lydie Bonal, Michèle Bourot-Denise, Vincent Chevrier, et al.. Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. Meteoritics and Planetary Science, 2008, 43 (5), pp.959-980. ⟨insu-00361714⟩
138 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More