Aspects of the validation of magnetic remanence in meteorites

摘要: — Meteorite magnetic records constitute physical evidence of processes acting during early solar system evolution. Consequently, the validation these is important in meteorite research. The first step process should be REM value. value ratio natural remanence (NRM) to saturation remanent magnetization imparted by a 1 T field (SIRM). values range over 3 4 orders magnitude for stony meteorites and chondrules from Allende (C3V-S1), Bjurbole (L4-S1), Chainpur (LL3-S1) meteorites. The computed published NRM SIRM data identify many including >100 × 10−3. These suggest dependence intensity on curatorial location which sample was obtained. Any earth rock acquiring thermoremanent (TRM) geomagnetic has restricted mostly between 5 50 10−3, exception being mineral hematite multidomain size range. only terrestrial samples with much greater than 100 10−3 are those struck lightning. The provides basis recognition valid that “might contaminated.” isothermal acquisition (RA) curve presented as contamination allows an indication level required give “REM” (RM/SIRM) In case chondrules, RA indicates unrealistically large fields would This other hand magnet normally available experimenter. require explanation involve chondrule formation, or some extraordinary mechanism remains described. Magnetic experiments, using ∼80 ∼40 mT magnets, demonstrate extent modification vector record mineralogy dependent, this related amount characteristics tetrataenite. complexity step. statement can made validation.