ROCK MAGNETISM - FUNDAMENTALS AND FRONTIERS
DAVID DUNLOP AND ÖZDEN ÖZDEMIR
Sujeito à disponibilidade do fornecedor
Área GEOLOGIA E MINERALOGIA
Número de páginas 595
This comprehensive treatment of fine particle magnetism and the magnetic properties of rocks leads from the fundamentals to the cutting edge of research in rock magnetism. Starting from atomic magnetism and magnetostatic principles, the authors explain why domains and micromagnetic structures form in ferrimagnetic crystals and how these lead to magnetic memory in the form of thermal, chemical and other remanent magnetizations. Such magnetisations are phenomenally stable and provide a record of the plate tectonic motions of continents and oceans over millions of years. Thermal activation theory, in which changes in magnetic domains and domain walls are blocked below a critical temperature or above a critical grain size, explains the high stability. One chapter is devoted to practical tests of domain state and palaeomagnetic stability. Another deals with pseudo-single-domain magnetism, that is particles that contain domain walls but behave like a single domain. The final four chapters place magnetism in the context of igneous, sedimentary, metamorphic, and extraterrestrial geology.