Paleomagnetic evidence for local oroclinal bending in the eastern Korean Peninsula

Yong Hee Park, Seong-Jae Doh

Research output: Contribution to journalArticle

Abstract

A paleomagnetic investigation has been carried out for the Lower Triassic Donggo Formation exposed in the Danyang area on the Yeongnam Massif to constrain local and regional tectonic history of the Taebaeksan Zone, Korean Peninsula. Among a total of 201 samples from 18 sites of the Donggo Formation, the characteristic remanent magnetization (ChRM) components were obtained from 166 samples. Field tests such as tilt test and reversal test reveal that the ChRM of the Donggo Formation is of primary in origin. The Early Triassic paleomagnetic pole position calculated from the site-mean directions of the primary magnetization is at 40.7°N, 17.8°E (A95 = 5.3°). Comparison of the reliable paleomagnetic poles from the Danyang (this study), Taebaek, and Yemi areas in the Taebaeksan Zone reveals a regional division of the pole position, indicating the clockwise vertical-axis rotation of the Taebaek area by 47.2 ± 11.1° with respect to the Danyang and Yemi areas after the formation of the Pyeongan Supergroup. In addition, there is a significant relation between strike deviations and declination deviations with some flattening of the regression line in the southern Taebaeksan Zone. Thus, it is interpreted that the Pyeongan Supergroup in this region had a primary curvature at the timing of sedimentation and subsequently experienced post-Early Triassic oroclinal bending of approximately 47°.

Original languageEnglish
Pages (from-to)703-711
Number of pages9
JournalGeosciences Journal
Volume21
Issue number5
DOIs
Publication statusPublished - 2017 Oct 1

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Triassic
remanent magnetization
magnetization
tilt
curvature
sedimentation
tectonics
history
test
comparison

Keywords

  • Donggo Formation
  • Korea
  • oroclinal bending
  • paleomagnetism
  • Yeongnam massif

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Paleomagnetic evidence for local oroclinal bending in the eastern Korean Peninsula. / Park, Yong Hee; Doh, Seong-Jae.

In: Geosciences Journal, Vol. 21, No. 5, 01.10.2017, p. 703-711.

Research output: Contribution to journalArticle

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