Some rockmagnetic parameters for natural goethite, pyrrhotite and fine-grained hematite

The increasing importance of sediments for paleomagnetic research \nprompted a study of rockmagnetic parameters of natural goethite, pyrrhotite \nand hematite. Grain-size dependent behaviour of such parameters is \npoorly known for goethite and pyrrhotite as well as for fine-grained \nhematite. Data of hematite indicate a complex rockmagnetic behaviour. \nExisting data seem to be contradictory in many aspects. The rockmagnetic \nparameters reported in the present thesis for the natural goethite and \npyrrhotite samples comprise twelve grain-size fractions from 250 micrometer \ndown to <5 micrometer. For the natural hematite sample, which has \na low-temperature origin, the <5 micrometer fraction was divided into \nsix grain-size fractions down to <0.25 micrometer.