By Celso B. Gomes, Klaus Keil
With a short, common advent at the value, class, Mineralogy, Bulk Composition, and popularity of Stone Meteorites
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Extra info for Brazilian Stone Meteorites
The field declination and inclination also vary. Lake sediments, soils, and loess (windblown sediment) record similar behaviour of the earth's field in the past, known as paleosecular variation (PSV). PSV records, if of high quality, are a powerful tool for dating and correlating sediments and soils over the past few thousand years. The correlation cannot be made over large distances because secular variation records fairly local variations in the field. The main problem in paleofield variation records isfidelityof the recording.
Relative paleointensities for a suite of related samples should be much easier to determine. , sediments of similar mineralogy deposited under similar conditions, have an unvarying fraction offine-grainedmagnetite. Various rock magnetic techniques, such as partial demagnetization of the NRM and normalization to synthetic magnetizations, are used to correct for the presence of softer, less reliable magnetic grains. These methods are described in Chapters 11 and 15. Ultimately one is still making inter-sample comparisons of total remanences; the subtlety of replicate determinations on various magnetization fractions of the same sample is lacking.
It is reasonable that electrons should interact electrostatically at such close quarters. 3 to give S, L and / for the whole atom. What is surprising is that 3d electrons of neighbouring atoms can have a strong spin-dependent interaction. , Fe 2+ and Fe 3+ in Fe3O4). The 3d rather than the 4s valence electrons must be the key. ) Heisenberg (1928) explained ferromagnetic exchange coupling as analogous to spin-dependent hydrogen bonding. We shall give a simple outline, following Stacey and Banerjee (1974).