Early Triassic palaeomagnetic results from the Ryeongnam Block, Korean Peninsula

The eastern extension of the North China Block

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15 Citations (Scopus)

Abstract

Greenish sandstones in the Early Triassic Nogam Formation of the Ryeongnam Block, Korean Peninsula were collected at 23 sites for palaeomagnetic study. A high-temperature magnetization component with unblocking temperatures of 670-690°C was isolated from seven sites and yielded a positive fold test at the 95 per cent confidence level. The high-temperature component is interpreted to be of primary origin because the folding age is Middle Triassic. The Early Triassic palaeomagnetic direction for the Ryeongnam Block after tilt correction is D=347.1°, I=23.8°(α=5.5°). The palaeomagnetic pole (62.5°N, 336.8°E, A95=4.7°) shows good agreement with the coeval pole for the North China Block, suggesting that the Ryeongnam Block has been part of the North China Block at least since Early Triassic times. A tectonic history of the Korean Peninsula includes obduction of the eastern part of the South China Block onto the central part of the Korean Peninsula in the Permian, with the Ryeongnam Block geographically isolated from the main part of the North China Block. Collision of the North and South China blocks commenced initially at the Korean Peninsula, and suturing of the two blocks progressed westwards.

Original languageEnglish
Pages (from-to)841-851
Number of pages11
JournalGeophysical Journal International
Volume139
Issue number3
DOIs
Publication statusPublished - Dec 1999
Externally publishedYes

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peninsulas
China
Triassic
Poles
Tectonics
Sandstone
poles
Temperature
obduction
Magnetization
magnetization
tilt
folding
sandstones
Permian
collision
sandstone
confidence
tectonics
fold

Keywords

  • Korea
  • Palaeomagnetism
  • Tectonics
  • Triassic

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

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abstract = "Greenish sandstones in the Early Triassic Nogam Formation of the Ryeongnam Block, Korean Peninsula were collected at 23 sites for palaeomagnetic study. A high-temperature magnetization component with unblocking temperatures of 670-690°C was isolated from seven sites and yielded a positive fold test at the 95 per cent confidence level. The high-temperature component is interpreted to be of primary origin because the folding age is Middle Triassic. The Early Triassic palaeomagnetic direction for the Ryeongnam Block after tilt correction is D=347.1°, I=23.8°(α=5.5°). The palaeomagnetic pole (62.5°N, 336.8°E, A95=4.7°) shows good agreement with the coeval pole for the North China Block, suggesting that the Ryeongnam Block has been part of the North China Block at least since Early Triassic times. A tectonic history of the Korean Peninsula includes obduction of the eastern part of the South China Block onto the central part of the Korean Peninsula in the Permian, with the Ryeongnam Block geographically isolated from the main part of the North China Block. Collision of the North and South China blocks commenced initially at the Korean Peninsula, and suturing of the two blocks progressed westwards.",
keywords = "Korea, Palaeomagnetism, Tectonics, Triassic",
author = "Koji Uno",
year = "1999",
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T1 - Early Triassic palaeomagnetic results from the Ryeongnam Block, Korean Peninsula

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AB - Greenish sandstones in the Early Triassic Nogam Formation of the Ryeongnam Block, Korean Peninsula were collected at 23 sites for palaeomagnetic study. A high-temperature magnetization component with unblocking temperatures of 670-690°C was isolated from seven sites and yielded a positive fold test at the 95 per cent confidence level. The high-temperature component is interpreted to be of primary origin because the folding age is Middle Triassic. The Early Triassic palaeomagnetic direction for the Ryeongnam Block after tilt correction is D=347.1°, I=23.8°(α=5.5°). The palaeomagnetic pole (62.5°N, 336.8°E, A95=4.7°) shows good agreement with the coeval pole for the North China Block, suggesting that the Ryeongnam Block has been part of the North China Block at least since Early Triassic times. A tectonic history of the Korean Peninsula includes obduction of the eastern part of the South China Block onto the central part of the Korean Peninsula in the Permian, with the Ryeongnam Block geographically isolated from the main part of the North China Block. Collision of the North and South China blocks commenced initially at the Korean Peninsula, and suturing of the two blocks progressed westwards.

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