Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
권호 표지

A preliminary AMS (anisotropy of magnetic susceptibility) study of the Namwon granite, southwest Korea

Otoh, Shigeru;Jwa, Yong-Joo;Nomura, Risato;Sakai, Hideo

  • Published : 1999.03.31

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Abstract

Anisotropy of magnetic susceptibility (AMS) was measured in the Namwon granite body (217-176 Ma), southwest Korea, along with some microscopic observations. It was revealed that the Namwon granite has subvertical magnetic foliation and subhorizontal magnetic lineation, but only weak signs of solid-state deformation. The trend of the magnetic foliation and lineation dextrally converges into the trend of the Sunchang shear zone (NNE) along the western margin of the Namwon granite body. The patterns of the magnetic foliation and lineation, as well as the weak signs of solid-state deformation, suggest that the magnetic fabrics reflect the synplutonic flow pattern of the Namwon granite influenced by the dextral ductile shearing along the Sunchang shear zone. Although the Namwon granite was considered as post-tectonic pluton, i.e., a pluton that postdated the dextral shearing along the Sunchang shear zone, the dextral movement must have lasted after the full consolidation of the Namwon granite body.

Keywords

References

  1. Tectonophysics v.184 Microstructure and magnetic susceptibility applied to emplacement kinematics of granites: the example of the Foix pluton (French Pyrenees) Bouchez, J.L.;Gleizes, G.;Djouadi, T.;Rochette, P.
  2. Earth and Planetary Science Letters v.118 Granite emplacement in an extensional setting: an AMS study of the magmatic structures of Monte Capanne (Elba, Italy) Bouillin, J.P.;Bouchez, J.L.;Lespinasse, P.;Pecher, A.
  3. International Symposium on Tectonic Evolution of Eastern Asian Continent on the occasion of the 50th Anniversary of the Geological Society of Korea (Short Paper) Structural analysis and determination of the timing of dextral ductile shear in the Sunchang shear zone in korea Cho, K.H.;Takagi, H.;Suzuki, K.
  4. Rb-Sr Age Determinations in the Ryeongnam Massif (II): Granitic Gneisses and Gneissose Granites in the South-Western Jirisan Region. Report 86-7 Choo, S.H.;Kim, S.J.
  5. Tectonophysics v.194 Indosinian dextral ductile fault system and synkinematic plutonism in the south-west of the Ogcheon belt (South Korea) Cluzel, D.;Lee, B.J.;Cadet, J.P.
  6. Journal of Geophysical Research v.97 Paleomagnetic constraints on the geodynamic history of the major blocks of China from the Permian to the present Enkin, R.J.;Yang, Z.;Chen, Y.;Courtillot, V.
  7. Nature v.356 Evidence from magnetic fabric for the flow pattern of magma in the Mackenzie giant radiating dyke swarm Ernst, R.E.;Baragar, W.R.A.
  8. Physics of the Earth and Planetary Interiors v.51 The magnetic fabrics of the Egletons granite (France): separation and structural implications Henry, B.
  9. Journal of the Geological Society of Korea v.24 Petrochemical study on Namwon granite body in the Namwon area Hong, S.S.;Kim, Y.J.;Kim, J.B.
  10. Tectonophysics v.79 Characterization of the magnetic fabric of rocks Jelinek, V.
  11. Geochemical Journal v.30 Advances in U-Pb zircon geochronology of Mesozoic plutonism in the southwestern part of Ryeongnam massif, Korea Kim, C.B.;Turek, A.
  12. Journal of Southeast Asian Earth Sciences v.9 Structural characteristics of the Sunchang Shear Zone, Korea Kim, J.H.;Kee, W.S.
  13. Journal of the Geological Society of Korea v.24 The study on igneous rocks and their igneous activity in the Jangsoo-Unbong area Kim, Y.J.;Lee, C.S.
  14. Journal of Korean Institute of Mining Geology v.20 Petrographic study on mylonitic granite in the Unbong-Ayoung area Kim, Y.J.;Kim, J.B.;Dallmeyer, R.D.
  15. Journal of the Petrological Society of Korea v.2 Contrasting $TiO_2/MgO$ ratios in the Namwon granite complex Kwon, S.T.;Hong, S.S.
  16. Journal of the Geological Society of Korea v.33 A note on the age of the Honam Shear Zone Kwon, S.T.;Ree, J.H.
  17. 30th Annual Meeting of Korea Society of Economic and Environmental Geology (Abstract) New radiometric ages of the granitic rocks in the Yeongnam Massif Lee, J.I.;Jwa, Y.J.;Kagami, H.;Uchiumi, S.
  18. Genesis of Granitoid Batholiths of Okchon Zone, Korea and Its Implications for Crustal Evolution Na, C.K.
  19. Mesozoic inversive wrench tectonics in far east Asia: examples from Korea and Japan;The Tectonic Evolution of Asia Otoh, S.;Yanai, S.;Yin, A.(ed.);Harrison, M.(ed.)
  20. Journal of the Tectonic Research Group of Japan v.39 Late Mesozoic tectonic development of South Korea: formation of the Honam strike-slip duplex and Cretaceous strike-slip basins Otoh, S.;Jwa, Y.J.;Lee, M.S.
  21. Triassic to Jurassic strike-slip tectonics along the eastern margin of Asia-a synthesis;Gondwana Dispersion and Asian Accretion Otoh, S.;Tsukada, K.;Sano, K.;Nomura, R.;Jwa, Y.J.;Yanai, S.;Metcalfe, I.(ed.)
  22. Physics of the Earth and Planetary Interiors v.87 Anisotropy of magnetic susceptibility in the Ponta Grossa dyke swarm (Brazil) and its relationship with magma flow direction Raposo, M.I.B.;Ernesto, M.
  23. Journal of Geophysical Research v.100 The Gangotri granite (Garhwal Himalaya): laccolithic emplacement in an extending collisional belt Scaillet, B.;Pecher, A.;Rochette, P.;Champenois, M.
  24. Geochemical Journal v.29 U-Pb zircon ages of Mesozoic plutons in the Damyang-Geochang area, Ryeongnam massif, Korea Turek, A.;Kim, C.B.
  25. Scientific Papers of College of Arts and Sciences of the University of Tokyo v.35 The Honam shear zone (South Korea); deformation and tectonic implication in the Far East Yanai, S.;Park, B.S.;Otoh, S.
  26. Honam intra-arc transcurrent fault and Jurassic geodynamics in east Asia;The Tancheng-Lujiang Wrench Fault System Yanai, S.;Jwa, Y.J.;Otoh, S.;Yamakita, S.;Park, B.S.;Xu, J.(ed.)