Magnetic transition at 30–34 Kelvin in pyrrhotite: insight into a widespread occurrence of this mineral in rocks |
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| Authors: | Pierre Rochette Grard Fillion Jean-Luc Matti Marinus J Dekkers |
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| Institution: | Pierre Rochette, Gérard Fillion, Jean-Luc Mattéi,Marinus J. Dekkers |
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| Abstract: | A characteristic magnetic transition at 30–34 K is shown to provide a powerful tool for the identification of pyrrhotite with concentration down to 10 ppm through the same low-temperature techniques as applied to magnetite and hematite, extended down to liquid helium temperature. A review of rock magnetic and petrological data on pyrrhotite suggests that this mineral should be considered as a major carrier of paleomatnetic signals. Unblocking temperature up to 350°C and extreme resistance against AF may be encountered in fine grained pyrrhotite. |
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