Econ. Environ. Geol. 2001; 34(4): 355-373

Published online August 31, 2001

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Palaeomagnetism of the Okchon Belt, Korea: Paleozoic Rocks in Yemi Area

In-Soo Kim*, Sung-Wook Kim and Eun-Kyeong Choi

Department of Geology, Pusan National University, Pusan 609-735, Korea

Correspondence to :

In-Soo Kim

insookim@pusan.ac.kr

Received: April 20, 2001; Accepted: August 14, 2001

Abstract

Palaeomagnesim of Paleozoic Tuwibong Type Sequence in Yemi area was studied with a total of 256 core-samples collected from 23 sites. The study area (geographical coordinates: 37.18oN, 128.61oE) is located between Taebaek and Yongwol belonging to the northeastern part of the Okchon Belt. Thermal cleaning was a most effective method to extract stable characteristic remanent magnetization (ChRM) direction, even though AF cleaning also worked on some specimens. Mean ChRM direction of the Cambrian Hwajol Formation was different from the present-day field direction and showed maximum clustering (max. k value) at 100% bedding-tilt correction. However, it could not pass the fold test. Ordovician Makkol and Kosong Limestones as well as Permian Sadong and
Kobangsan Formations have very weak NRM, and were remagnetized into the present-day field direction. ChRM directions from the Carboniferous Hongjom Formation passed both fold and reversal tests. IRM experiments and blocking temperature spectrum indicate that both magnetite and haematite are carrier of the primary magnetization. Palaeomagnetic pole position from the Carboniferous Hongjom Formation is very similar to that of contemporary North China Block (NCB) suggesting that the study area was a part of, or located very near to, the NCB during Carboniferous.

Keywords Okchon belt, Paleozoic, palaeomagnetism, Yemi area, North China Block (NCB)

Article

Econ. Environ. Geol. 2001; 34(4): 355-373

Published online August 31, 2001

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Palaeomagnetism of the Okchon Belt, Korea: Paleozoic Rocks in Yemi Area

In-Soo Kim*, Sung-Wook Kim and Eun-Kyeong Choi

Department of Geology, Pusan National University, Pusan 609-735, Korea

Correspondence to:

In-Soo Kim

insookim@pusan.ac.kr

Received: April 20, 2001; Accepted: August 14, 2001

Abstract

Palaeomagnesim of Paleozoic Tuwibong Type Sequence in Yemi area was studied with a total of 256 core-samples collected from 23 sites. The study area (geographical coordinates: 37.18oN, 128.61oE) is located between Taebaek and Yongwol belonging to the northeastern part of the Okchon Belt. Thermal cleaning was a most effective method to extract stable characteristic remanent magnetization (ChRM) direction, even though AF cleaning also worked on some specimens. Mean ChRM direction of the Cambrian Hwajol Formation was different from the present-day field direction and showed maximum clustering (max. k value) at 100% bedding-tilt correction. However, it could not pass the fold test. Ordovician Makkol and Kosong Limestones as well as Permian Sadong and
Kobangsan Formations have very weak NRM, and were remagnetized into the present-day field direction. ChRM directions from the Carboniferous Hongjom Formation passed both fold and reversal tests. IRM experiments and blocking temperature spectrum indicate that both magnetite and haematite are carrier of the primary magnetization. Palaeomagnetic pole position from the Carboniferous Hongjom Formation is very similar to that of contemporary North China Block (NCB) suggesting that the study area was a part of, or located very near to, the NCB during Carboniferous.

Keywords Okchon belt, Paleozoic, palaeomagnetism, Yemi area, North China Block (NCB)

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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