Natural remanent magnetizations of carbonaceous chondrites and the magnetic field in the early solar system.

摘要: Abstract The natural remanent magnetizations (NRM) of three carbonaceous chondrites, Allende (Type III), Murchison II) and Orgueil I), have been studied in an attempt to explain the origin stable component their NRM which is greatest least Orgueil. Thermal demagnetization remagnetization a known field were observed using spinner magnetometer conjunction with zero-field vacuum furnace alternating demagnetizer; high thermomagnetic properties Curie balance. Additional work involving reflected light microscopy electron probe microanalysis carried out on polished sections characterize carriers NRM. Results suggest that these remanences acquired at temperature lower than 135°C. Inconsistent data obtained heating above Using results below this assumption acquisition process was thermoremanence, we deduce ambient magnetic fields during formation primitive meteorites between 0.2 1.1 Oe. latter figure (1.1) from considered be more reliable other two. If, fact, by processes values are regarded as limits. In any case, figures for primordial about 10 4 times greater present interplanetary field. Such accord those cosmological theories require very large solar system.