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

Yong Hee Park, Seong-Jae Doh, Wonnyon Kim, Dongwoo Suk

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)855-869
Number of pages15
JournalEarth, Planets and Space
Volume57
Issue number9
Publication statusPublished - 2005 Nov 21

Fingerprint

magnetic fabric
Korea
metasedimentary rock
garnets
rocks
biotite
rock
magnetic permeability
magnetic anisotropy
garnet
anisotropy
andalusite
pyrrhotite
sillimanite
lineation
mineralogy
dipping
magnetite
cleavage
tectonics

Keywords

  • Magnetic fabric
  • Magnetic mineralogy
  • Metamorphism
  • Okcheon Belt

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Magnetic fabric and rock magnetic studies of metasedimentary rocks in the central Okcheon Metamorphic Belt, Korea. / Park, Yong Hee; Doh, Seong-Jae; Kim, Wonnyon; Suk, Dongwoo.

In: Earth, Planets and Space, Vol. 57, No. 9, 21.11.2005, p. 855-869.

Research output: Contribution to journalArticle

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