Skip to main content


We’d like to understand how you use our websites in order to improve them. Register your interest.

Magnetic fabric and rock magnetic studies of metasedimentary rocks in the central Okcheon Metamorphic Belt, Korea


Anisotropy of magnetic susceptibility (AMS) and rock magnetic studies have been carried out for the metasedimentary rocks in the central Okcheon Metamorphic Belt. The study area is divided into three metamorphic zones: the biotite zone, the garnet zone, and the sillimanite+andalusite zone from southeast to northwest. Magnetic foliation dipping to the northwest is the dominant magnetic fabric in the biotite zone. Magnetic lineation plunging down-dip of the vertical cleavage plane is appeared in the southeastern part of the garnet zone, while magnetic lineation plunging to southeast prevails in the middle and northwestern parts of the garnet zone. It is interpreted that this apparent synform structure, defined by AMS fabric data, was formed by successive top-to-the-southeast vergent thrusting followed by back-steepening process during the regional metamorphism in the Late Paleozoic. In the sillimanite + andalusite zone, AMS fabric is clearly defined and may reflect a tectonic fabric, recorded during the thermal metamorphism in the middle Jurassic, despite the scarcity of rock fabric in the field. The spatial distribution of magnetic mineralogy, defined by the rock magnetic results, implies the 500°C isotherm at the boundary between the biotite and garnet zones, which is associated with the transformation of pyrrhotite into magnetite above 500°C under the oxidizing condition.


  1. Averbuch, O., D. Frizon de Lamotte, and C. Kissel, Magnetic fabric as a structural indicator of the deformation path within a fold thrust structure: a test case from the Corbières (NE Pyrenees, France), J. Struct. Geol., 14, 461–474, 1992.

  2. Bina, M. and L. Daly, Mineralogical change and self-reversed magnetizations in pyrrhotite resulting from partial oxidation: geophysical implications, Phys. Earth Planet. Inter., 85, 83–99, 1994.

  3. Bina, M., J. Corpel, L. Daly, and N. Debeglia, Transformation of pyrrhotite to magnetite by heating: a potential source of magnetic anomalies, C. r. Acad. Sci., Ser. II, 313, 487–494, 1991.

  4. Borradaile, G. J., Magnetic susceptibility, petrofabrics and strain, Tectonophysics, 156, 1–20, 1988.

  5. Borradaile, G. J. and B. Henry, Tectonic applications of magnetic susceptibility and its anisotropy, Earth Sci. Rev., 42, 49–93, 1997.

  6. Borradaile, G. J., A. MacKenzie, and E. Jensen, Silicate versus trace mineral susceptibility in metamorphic rocks, J. Geophys. Res., 95, 8447–8451, 1990.

  7. Butler, R. F., Palaeomagnetism: Magnetic Domains to Geologic Terranes, 319 pp., Blackwell Scientific Publications, Boston, 1992.

  8. Cheong, C. S., K. Y. Cheong, H. Kim, M. S. Choi, S. Lee, and M. Cho, Early Permian peak metamorphism recorded in U-Pb system of black slates from the Ogcheon metamorphic belt, South Korea, and its tectonic implication, Chem. Geol., 193, 81–92, 2003.

  9. Cho, M. and H. Kim, Metamorphic Evolution of the Ogcheon Metamorphic Belt: Review of Recent Studies and Remaining Problems, Jour. Petrol. Soc. Korea, 11, 121–137, 2002.

  10. Chough, S. K., S.-T. Kwon, J.-H. Ree, and D. K. Choi, Tectonic and sedimentary evolution of the Korean peninsula: a review and new view, Earth Sci. Rev., 52, 175–235, 2000.

  11. Cluzel, D., Formation and tectonic evolution of early Mesozoic intramontane basins in the Ogcheon belt (South Korea): a reappraisal of the Jurassic “Daebo orogeny”, J. Southeast Asian Earth Sci., 7, 223–235, 1992.

  12. Cluzel, D., J. P. Cadet, and H. Lapierre, Geodynamics of the Okcheon Belt (South Korea), Tectonophysics, 183, 41–56, 1990.

  13. Cluzel, D., L. Jolivet, and J.-P. Cadet, Early Middle Paleozoic intraplate orogeny in the Okcheon belt (South Korea): a new insight on the Paleozoic buildup of East Asia, Tectonics, 10, 1130–1151, 1991.

  14. Evans, M. A., M. T. Lewchuk, and R. D. Elmore, Strain partitioning of deformation mechanisms in limestones: examining the relationship of strain and anisotropy of magnetic susceptibility (AMS), J. Struct. Geol., 25, 1525–1549, 2003.

  15. Ferry, J. M., Petrology of graphitic sulfide-rich schists from south-central Main: an example of desulfidation during prograde regional metamorphism, Am. Mineral, 66, 171–269, 1981.

  16. Frizon de Lamotte, D., C. Souque, S. Grelaud, and P. Robion, Early record of tectonic magnetic fabric during inversion of a sedimentary basin: Short review and examples from the Corbiéres transfer zone (France), Bull. Soc. Geol. France, 173, 461–463, 2002.

  17. Fuller, M. D., Magnetic anisotropy and paleomagnetism, J. Geophys. Res., 68, 293–309, 1963.

  18. Graham, J. W., Magnetic anisotropy, an unexploited petrofabric element, Geol. Soc. Am. Bull., 65, 1257–1258, 1954.

  19. Grégoire, V., M. Saint Blanquat, A. Nédélec, and J.-L. Bouchez, Shape anisotropy versus magnetic interactions of magnetite grains: experiments and application to AMS in granitic rocks, Geophys. Res. Lett., 22, 2765–2763, 1995.

  20. Hargraves, R. B., D. Johnson, and C. Y. Chan, Distribution anisotropy: The cause of AMS in igneous rocks?, Geophys. Res. Lett., 18, 2193–2196, 1991.

  21. Hrouda, F., Magnetic anisotropy of rocks and its application in geology and geophysics, Geophys. Surv., 5, 37–82, 1982.

  22. Jelinek, V., Characterization of the magnetic fabric of rocks, Tectonophysics, 79, 63–67, 1981.

  23. Kanamatsu, T., E. Herrero-Bervera, and A. Taira, Magnetic fabrics of soft-sediment folded strata within a Neogene accretionary complex, the Miura group, central Japan, Earth Planet. Sci. Lett., 187, 333–343, 2001.

  24. Kang, J. H. and C. G. Lee, Geological Structure of Okcheon Metamorphic Zone in the Miwon-Boeun area, Korea, Jour. Petrol. Soc. Korea, 11, 234–249, 2002.

  25. Kim, H. and M. Cho, Polymetamorphism of Ogcheon Supergroup in the Miwon area, central Ogcheon metamorphic belt, South Korea, Geosciences Journal, 3, 151–162, 1999.

  26. Kim, O. J., D. S. Lee, and H. Y. Lee, Explanatory text of the 1:50,000 geologic map of Boeun sheet, 35 pp., Korea Research Institute of Geoscience and Mineral Resource, 1977.

  27. Kim, S. W., T. Itaya, H. Hyodo, and T. Matsuda, Metamorphic K-feldspar in low-grade metasediments from the Ogcheon metamorphic belt in South Korea, Gondwana Res., 5, 849–855, 2002.

  28. Koh, H. J. and J. H. Kim, Deformation sequence and characteristics of the Okcheon Supergroup in the Goesan area, central Okcheon Belt, Korea, J. Geol. Soc. Korea, 31, 271–298, 1995.

  29. Lee, C. H., M. S. Lee, and B. S. Park, Explanatory text of the 1:50,000 geologic map of Miweon sheet, 29 pp., Korea Research Institute of Geoscience and Mineral Resource, 198

  30. Lee, K. S., H. W. Chang, and K. H. Park, Neoproterozoic bimodal volcanism in the central Ogcheon belt, Korea: age and tectonic implication, Precambrian Research, 89, 47–57, 1998.

  31. Lowrie, W., Identification of ferromagnetic minerals in a rock by coercivity and unblocking temperature properties, Geophys. Res. Lett., 17, 159–162, 1990.

  32. Oh, C. W., Y. W. Kwon, and S. W. Kim, Metamorphic Evolution of the central Okcheon Metamorphic Belt in the Cheongju-Miwon area, Korea. Jour. Petrol. Soc. Korea, 8, 106–123, 1999.

  33. Oh, C. W., S. W. Kim, I. C. Ryu, T. Okada, H. Hyodo, and T. Itaya, Tectono-metamorphic evolution of the Okcheon Metamorphic Belt, South Korea: Tectonic implications in East Asia, Island Arc, 13, 387–402, 2004.

  34. Parés, J. P., B. A. van der Pluijm, and J. Dinarès-Turell, Evolution of magnetic fabric during incipient deformation of mudrocks (Pyrenees, Northern Spain), Tectonophysics, 307, 1–14, 1999.

  35. Ree, J.-H., S.-H. Kwon, Y. Park, S.-T. Kwon, and S.-H. Park, Pretectonic and posttectonic emplacements of the granitoids in the south central Okchon belt, South Korea: Implications for the timing of strike-slip shearing and thrusting, Tectonics, 20, 850–867, 2001.

  36. Robion, P., D. Frizon de Lamotte, C. Kissel, and C. Aubourg, Tectonic versus mineralogical contribution to the magnetic fabrics of epimetamorphic slaty rocks: an example from the Ardennes Massif (France- Belgium), J. Struct. Geol., 17, 1111–1124, 1995.

  37. Robion, P., C. Kissel, D. Frizon de Lamotte, J. P. Lorand, J. C. Guézou, Magnetic mineralogy and metamorphic zonation in the Ardennes Massif (France-Belgium), Tectonophysics, 271, 231–248, 1997.

  38. Rochette, P., Metamorphic control of the magnetic mineralogy of the black shales in the Swiss Alps: toward the use of ‘magnetic isogrades’, Earth Planet. Sci. Lett., 84, 446–456. 1987.

  39. Rochette, P., J. Jackson, and C. Aubourg, Rock magnetism and the interpretation of anisotropy of magnetic susceptibility, Rev. Geophys., 30, 209–234, 1992.

  40. Rochette, P., J.-P. Lorand, G. Fillion, and V. Sautter, Pyrrhotite and the remanent magnetization of SNC meteorites: a changing perspective on Martian magnetism, Earth Planet. Sci. Lett., 190, 1–12, 2001.

  41. Sagnotti, A., F. Speranza, A. Winkler, M. Mattei, and R. Funiciello, Magnetic fabric of clay sediments from the external northern Apennines (Italy), Phys. Earth. Planet. Inter., 105, 73–93, 1998.

  42. Saint-Bezar, B., R. L. Hebert, C. Aubourg, P. Robion, R. Swennen, and D. Frizon de Lamotte, Magnetic fabric and petrographic investigation of hematite-bearing sandstones within ramp-related folds: examples from the South Atlas From (Morocco), J. Struct. Geol., 24, 1507–1520, 2002.

  43. Stephenson, A., Distribution anisotropy: two simple models for magnetic lineation and foliation, Phys. Earth Planet. Inter., 82, 49–53, 1993.

  44. Tarling, D. J. and F. Hrouda, The Magnetic Anisotropy of Rocks, 217 pp., Chapman and Hall, London, 1993.

Download references

Author information



Corresponding author

Correspondence to Yong-Hee Park.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Park, Y., Doh, S., Kim, W. et al. Magnetic fabric and rock magnetic studies of metasedimentary rocks in the central Okcheon Metamorphic Belt, Korea. Earth Planet Sp 57, 855–869 (2005).

Download citation


  • Magnetic fabric
  • magnetic mineralogy
  • metamorphism
  • Okcheon Belt