Skip to main content

Magnetic properties of pyroclastic rocks from the later stage of the eruptive activity of Haruna Volcano in relation to the self-reversal of thermo-remanent magnetization

Abstract

Focusing to the self-reversal of Thermo-Remanent Magnetization (TRM), we examined magnetic properties of 32 pieces of unoriented pumice samples, which were systematically collected from eight layers of pumice-fall and pumice-flow deposits at Haruna Volcano, Japan in the two stages of the eruption, i.e., Futatsu-dake stage (the 5th stage) and caldera-forming stage (the 4th stage). The magnetic behaviors of TRM well correlated with the primary chemical composition (TiO2-content or x (molecular fraction value of ilmenite in xFeTiO3-(1−x)Fe2O3)) of the hemoilmenite phenocrysts in the samples. That is, the samples of which chemical composition of hemoilmenite is TiO2 30 wt% (x 0.582) showed various types of TRM including typical intense Self-Reversed Thermo-Remanent Magnetization (SRTRM), whereas the samples of which chemical composition of hemoilmenite is TiO2 32 wt% (x 0.620) showed one type of TRM; weak intensity of self-reversed component of TRM. This result harmonizes with the well-known diagram by Uyeda, where the intensity of SRTRM of hemoilmenite (quenched) is an explicit function of the chemical composition, and only in the restricted narrow range of the chemical composition, intense SRTRM is acquired. Moreover, the hemoilmenite samples of which chemical composition is less than TiO2 31 wt% (x 0.60) are capable to acquire various intensities of SRTRM on annealing according to its condition. In our TiO2-poorer (or smaller-x) samples, the variety in the behavior of TRM is well explained with this annealing effect in this compositional range.

References

  • Akimoto, S., Magnetic properties of ferromagnetic minerals contained in igneous rocks, Japan, J. Geophys., 1(2), 1–31, 1955.

    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., An order-disorder transformation phenomenon in the FeTiO3-Fe2O3 solid solution series, J. Phys. Soc. Japan, 13, 828–837, 1958.

    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-I, 714–718, 1962.

    Article  Google Scholar 

  • Ishikawa, Y. and Y. Syono, Order-disorder transformation and reverse thermo-remanent magnetism in the FeTiO3-Fe2O3 system, J. 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., 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. Earth Planet. Inter., 46, 270–288, 1987.

    Article  Google Scholar 

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

    Google Scholar 

  • Nagata, T., S. Akimoto, and S. Uyeda, Self-reversal of thermo-remanent magnetism of igneous rocks (3), J. Geomag. Geoelectr., 5, 168–184, 1953.

    Article  Google Scholar 

  • Nagata, T., S. Akimoto, S. Uyeda, K. Momose, and E. Asami, Reverse magnetization of rocks and its connection with the geomagnetic field, J. Geomag. Geoelectr., 6, 182–193, 1955.

    Article  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., Compositional variation of Fe-Ti oxides in the rocks of Haruna Volcano, Bull. Volc. Soc. Japan, Ser. 2,17, 111–112, 1972a (in Japanese).

  • Oshima, O., Pyroclastic flows and related deposits of Haruna Volcano, Bull. Volc. Soc. Japan, Ser. 2, 17, 156–157, 1972b (in Japanese).

    Google Scholar 

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

    Google Scholar 

  • Oshima, O., Fe-Ti oxide minerals in pumices (1), Bull. Volc. Soc. Japan, Ser. 2, 23, 297, 1978 (in Japanese).

    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 

  • Oshima, O. and M. Ozima, Geomagnetic study of pyroclastic rocks of Haruna Volcano with special reference to the self-reversal thermoremanent magnetization, Abstract of the Volc. Soc. of Japan, 104, 1999 (in Japanese).

  • Ozima, M. and M. Funaki, 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 Planets Space, 53, 111–119, 2001.

    Article  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 

  • Padovani, E. R., Granulite facies xenoliths from Kilbourne Hole maar, New Mexico and their bearing on deep crustal evolution, Thesis, Univ. of Tex. at Dallas, Richardson, 1977.

    Google Scholar 

  • Prévot, M., K. A. Hoffman, A. Goguitchaichvili, J.-C. Doukhan, V. Shcherbakov, and M. Bina, The mechanism of self-reversal of thermoremanence in natural hemoilmenite crystals: new experimental data and model, Phys. Earth Planet. Inter., 126, 75–92, 2001.

    Article  Google Scholar 

  • Sawada, Y., M. Hyodo, M. Fukue, Y. Asahara, C. Kashine, and M. Tateno, Magnetic mineral showing self-reversed TRM from Quaternary Sambe and Daisen Volcanoes, SW Japan Arc, Abstract of the Volc. Soc. of Japan, 1, 1999 (in Japanese).

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

    Article  Google Scholar 

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

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Mituko Ozima.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Ozima, M., Oshima, O. & Funaki, M. Magnetic properties of pyroclastic rocks from the later stage of the eruptive activity of Haruna Volcano in relation to the self-reversal of thermo-remanent magnetization. Earth Planet Sp 55, 183–188 (2003). https://doi.org/10.1186/BF03351747

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03351747

Key words

  • Self-reversal
  • TRM
  • Haruna Volcano
  • dacite pumice