Hydrothermal fluid-controlled remagnetization of sedimentary rocks in Korea

Tectonic importance of pervasive Tertiary remagnetization

Wonnyon Kim, Seong-Jae Doh, Yongjae Yu, Jeong Jick Lee, Dongwoo Suk

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In order to better understand the tectonic environment of the Korean Peninsula since Cretaceous, a paleomagnetic study was carried out on the Jinan Basin located in southwestern Korea. From the demagnetization of 597 samples, we found that remanence is carried by pyrrhotite and/or magnetite (black siltstone) and hematite (red siltstone), which is a common magnetic mineral assemblage of the rocks remagnetized in Early Tertiary in Korea. All the rock units recorded identical ancient geomagnetic field directions. In particular, paleodirections were better clustered in geographic coordinates, indicating a secondary origin. The presence of abundant silicates as inclusions within Fe-oxides and Fe-sulfides confirms the authigenic origin of the magnetic carriers, precipitated by fluid mediated chemical processes. Compilation of the Korean Cretaceous and Tertiary poles indicates that the Jinan Basin was remagnetized in the Early Tertiary age. In addition, comparison of the Korean Cretaceous and Tertiary poles with those from adjacent major terrains including China and Siberia reveals that a dominant feature of tectonic motions in Korea was a vertical-axis rotation. Sense of vertical-axis rotation was time-dependent, with clear distinction between clockwise rotation in Cretaceous and counter-clockwise rotation in Early Tertiary. Such differences in the mode of vertical axis rotation might be caused by the activities of basin-bounding strike-slip faults in Korea, possibly driven by the changes of subduction regime of the Kula-Pacific plate in Early Tertiary.

Original languageEnglish
Pages (from-to)684-695
Number of pages12
JournalTectonophysics
Volume474
Issue number3-4
DOIs
Publication statusPublished - 2009 Sep 10

Fingerprint

remagnetization
sedimentary rocks
Korea
hydrothermal fluid
sedimentary rock
tectonics
magnetization
fluids
Cretaceous
poles
counter rotation
rocks
siltstone
Siberia
pyrrhotite
peninsulas
demagnetization
geomagnetism
remanence
hematite

Keywords

  • Cretaceous
  • Early Tertiary
  • Korea
  • Paleomagnetism
  • Remagnetization
  • Tectonics

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

Hydrothermal fluid-controlled remagnetization of sedimentary rocks in Korea : Tectonic importance of pervasive Tertiary remagnetization. / Kim, Wonnyon; Doh, Seong-Jae; Yu, Yongjae; Lee, Jeong Jick; Suk, Dongwoo.

In: Tectonophysics, Vol. 474, No. 3-4, 10.09.2009, p. 684-695.

Research output: Contribution to journalArticle

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