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• W2052518277 abstract "The ferromagnetism of irons, stony-irons, E-, H-, L- and LL-chondrites and achondrites is due to a metallic phase comprising mostly Fe and Ni and small amounts of Co and P. The ferromagnetic constituent in non-metamorphosed C-chondrites is magnetite, but some metamorphosed C-chondrites contain FeNi metallic grains too. Among the stony meteorites, the content of metals as determined by their saturation magnetization (IS) sharply decreases in the order E → H → L → LL → achondrites, whereas the IS value for magnetite and additional metals in C-chondrites ranges from the IS value of achondrites to that of L-chondrites. With an increase of Ni-content in the metallic phase in chondrites of the order E → H → L → LL → C, the relative amount of Ni-poor kamacite magnetization, IS(α), in the total IS decreases in the same order, from IS(α)/IS ∼ 1 for E-chondrites to IS(α)/IS ∼ 0 for C-chondrites. Thus, E-, H-, L-, LL- and C-chondrites and achondrites are well separated in a diagram of IS(α)/IS versus I, which could be called a magnetic classification diagram for stony meteorites. As the surface skin layer of all meteorites is anomalously magnetized, it must be removed and the natural remanent magnetization (NRM) of the unaltered interior only must be examined for the paleomagnetic study. The NMR of C-chondrites is highly stable and that of achondrites is reasonably stable against AF-demagnetization, whereas the NMR of E-chondrites and ordinary chondrites as well as stony-iron meteorites is not very stable in most cases. Although the NRM of iron meteorites is reasonably stable, it is not attributable to the extraterrestrial magnetic field. The paleointensity for Allende C3-chondrite is estimated to be about 1.0 Oe assuming that its NRM is of TRM origin. The paleointensity for other reasonably reliable C-chondrites (Orgueil, Mighei, Leoville and Karoonda) is also around 1 Oe. The paleointensity for two achondrites has been determined to be about 0.1 Oe. The NRM of other achondrites also suggests that their paleointensity is roughly 0.1 Oe. The NRM of ordinary chondrites is less stable than that of C-chondrites and achondrites so that the estimated paleointensity for ordinary chondrites is less reliable. The paleointensity for comparatively reliable ordinary chondrites ranges from 0.1 to 0.4 Oe. The paleointensity values of 1 Oe for C-chondrites and 0.1 Oe for achondrites may represent the early solar nebula magnetic field about 4.5 × 109 years ago. A possibility that the paleomagnetic field for achondrites was a magnetic field attributable to a dynamo within a metallic core of their parent planet may also not be rejected." @default.
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• W2052518277 date "1979-11-01" @default.
• W2052518277 modified "2023-10-05" @default.
• W2052518277 title "Meteorite magnetism and the early solar system magnetic field" @default.
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• W2052518277 doi "https://doi.org/10.1016/0031-9201(79)90055-4" @default.
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