Abstract
IN three earlier communications1, we described the magnetic, chemical and crystallographic properties of the ferromagnetic minerals causing self-reversal of thermo-remanent magnetization of igneous rocks. The results of studies of these properties showed that most grains of ferromagnetic minerals in the Haruna dacitic rocks consist of two different ferromagnetic constituents; one called A is titanium-poor titano-magnetite having a crystal structure of inverse spinel type and Curie point around 500° C.; another called B is a solid solution of ilmenite and hæmatite (hæmoilmenite) having rhombohedral crystal structure and Curie point of about 230° C.
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References
Nagata, T., Nature, 169, 704 (1951); 172, 850 (1953). Nagata, T., et al., Nature, 172, 630 (1953).
Néel, L., Ann. Geophys., 7, 90 (1951).
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NAGATA, T., UYEDA, S. Interaction of Two Constituents in Ferromagnetic Materials showing Reverse Thermo-remanent Magnetism. Nature 175, 35–36 (1955). https://doi.org/10.1038/175035b0
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DOI: https://doi.org/10.1038/175035b0
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