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Magnetic properties of hemoilmenite single crystals in Haruna dacite pumice revealed by the Bitter technique, with special reference to self-reversal of thermoremanent magnetization

Abstract

In order to reconsider the mechanism of the self-reversal of TRM (SRTRM) of hemoilmenite in dacite pumice, magnetic properties of newly collected Haruna dacite pumice near the historical sampling site (more than 50 years ago) were investigated again. All Haruna dacite pumice samples collected showed SRTRM or at least partial SRTRM. This time, the methods of microprobe analysis and the Bitter technique which were not available 50 years ago, were added to examine hemoilmenite crystals. Contrary to the result which was first reported by Hoffmann and Fehr on the basis of the micromagnetic observation of hemoilmenite crystals in Pinatubo dacite pumice, our hemoilmenite crystals are considerably more homogeneous in TiO2-content in a single crystal than those of Hoffmann and Fehr. Also, we could not find any “shell structure” with two phases having different magnetism and compositions in a single crystal of hemoilmenite in Haruna dacite pumice. We came to the conclusion that the intergrown shell-structure itself in Hoffmann and Fehr’s model may not be essential but only the coexistence of the intergrown two phases in a single crystal of hemoilmenite must be essential for the acquisition of SRTRM of hemoilmenite. Both models, one by Ishikawa and Syono and the other by Hoffmann and Fehr are basically similar to each other, regardless of the structure involved.

References

  • Bina, M., J. C. Tanguy, V. Hoffmann, M. Prévot, E. L. Listanco, R. Keller, K. Th. Fehr, A. T. Goguitchaïchvili, and R. S. Punongbayan, A detailed magnetic and mineralogical study of self-reversed dacitic pumices from the 1991 Pinatuboeruption (Philippines), Geophys. J. Int., 138, 159–178, 1999.

    Article  Google Scholar 

  • Brown, N. E., A. Navrotsky, G. L. Nord, Jr., and S. K. Banerjee, Hematit-eilmenite (Fe2O3-FeTiO3) solid solutions: Determinations of Fe-Ti order from magnetic properties, Am. Mineral., 78, 941–951, 1993.

    Google Scholar 

  • Goguitchaichvili, A. and M. Prévot, Magnetism of oriented single crystals of hemoilmenite with self-reversed thermoremanent magnetization, J. Geophys. Res., 105(B2), 2761–2780, 2000.

    Article  Google Scholar 

  • Haag, M., F. Heller, M. Lutz, and E. Reusser, Domain observations of the magnetic phases in volcanics with self-reversed magnetization, Geophys. Res. Lett., 20(8), 675–678, 1993.

    Article  Google Scholar 

  • Heller, F., J. C. Carracedo, and V. Soler, Reversed magnetization in pyroclastics from the 1985 eruption of Nevado del Ruiz, Colombia, Nature, 324, 241–242, 1986.

    Article  Google Scholar 

  • Hoffman, K. A., Self-reversal of thermoremanent magnetization in the ilmenite-hematite system: order-disorder, symmetry and spin alignment, J. Geophys. Res., 97(B7), 10883–10895, 1992.

    Article  Google Scholar 

  • Hoffmann, V. and K. Th. Fehr, Micromagnetic, rockmagnetic and mineralogical studies on dacitic pumice from the Pinatubo eruption (1991, Philippines) showing self-reversed TRM, Geophys. Res. Lett., 23, 2835–2838, 1996.

    Article  Google Scholar 

  • Ishikawa, Y., Magnetic properties of ilmenite-hematite system at low temperature, J. Phys. Soc. Japan, 17, 1835–1844, 1962.

    Article  Google Scholar 

  • Ishikawa, Y. and Y. Syono, Reverse thermo-remanent magnetism in the FeTiO3-Fe2O3 system, J. Phys. Soc. Japan, 17(B-1), 714–718, 1962.

    Google Scholar 

  • Ishikawa, Y. and Y. Syono, Order-disorder transformation and reverse thermoremanent magnetism in the FeTiO3-Fe2O3 system, Phys. Chem. Solids, 24, 517–528, 1963.

    Article  Google Scholar 

  • Kennedy, L. P., Self-reversed thermoremanent magnetization in a late Brunhes dacite pumice, J. Geomag. Geoelectr., 33, 429–448, 1981.

    Article  Google Scholar 

  • Lawson, C. A., G. L. Nord, Jr., and D. E. Champion, Fe-Ti oxide mineralogy and the origin of normal and reverse remanent magnetization in dacitic pumice blocks from Mt. Shasta, California, Phys. Eearth Planet. Inter., 46, 270–288, 1987.

    Article  Google Scholar 

  • Nagata, T., S. Akimoto, and S. Uyeda, Reverse thermo-remanent magnetism, Proc. Jap. Acad., 27, 643–645, 1951.

    Google Scholar 

  • Nord, G. L., Jr. and C. A. Lawson, Order-disorder transition-induced twin domains and magnetic properties in ilmenite-hematite, Am. Mineral., 74, 160–176, 1989.

    Google Scholar 

  • Oshima, O., Compositional variation of magnetite during the eruption and its bearing on the stage of crystallization of magma of Futatsu-dake, Haruna volcano, Mineral. J., 6, 249–263, 1971.

    Article  Google Scholar 

  • Oshima, O., Mineralogical aspects of volcanic eruption, Bull. Volc. Soc. Japan, ser. 2, 20, 275–298, 1975 (in Japanese).

    Google Scholar 

  • Oshima, O., Oxidation exsolution of titanomagnetite in a dacite from Haruna volcano, Sci. Pap. Coll. Gen. Educ. Univ. Tokyo, 30, 79–87, 1980.

    Google Scholar 

  • Oshima, O., Reduction decomposition of hemoilmenite in a cooling magma and its relation to the changes of magnetization of rocks, Rock Magnetism and Paleogeophysics, 9, 102–105, 1982.

    Google Scholar 

  • Ozima, M., M. Funaki, N. Hamada, S. Aramaki, and T. Fujii, Self-reversal of thermo-remanent magnetization in pyroclastics from the 1991 eruption of Mt. Pinatubo, Philippines, J. Geomag. Geoelectr., 44, 979–984, 1992.

    Article  Google Scholar 

  • Sawada, Y., M. Fukue, and M. Hyodo, Paleomagnetic study of the Sambe Volcano: age of dacite domes, temperature of pyroclastic flow, and self-reversed magnetic mineral, Abstracts 1999 Japan Earth and Planetary Science Joint Meeting, Vc-006, Tokyo, Japan, June 8–11, 1999 (in Japanese).

  • Uyeda, S., Thermoremanent magnetism and coercive force of the ilmenitehematite series, J. Geomag. Geoelectr., 9, 61–78, 1957.

    Article  Google Scholar 

  • Uyeda, S., Thermoremanent magnetism as a medium of paleomagnetism, with special reference to reverse thermo-remanent magnetism, Jap. J. Geophys., 2, 1–123, 1958.

    Google Scholar 

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Ozima, M., Funaki, M. Magnetic properties of hemoilmenite single crystals in Haruna dacite pumice revealed by the Bitter technique, with special reference to self-reversal of thermoremanent magnetization. Earth Planet Sp 53, 111–119 (2001). https://doi.org/10.1186/BF03352368

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