옥천대 북동부에 분포하는 하부 고생대층에 대한 고지자기 연구

• 영문명: Paleomagnetic study of the lower ordovician formations in the north eastern Okcheon zone
• 발행기관: 대한자원환경지질학회
• 저자명: 민경덕(Kyung Duck Min) 이윤수(Youn Soo Lee) 황석연(Suk Yeon Hwang)
• 간행물 정보: 『자원환경지질』26권 3호, 395~401쪽, 전체 7쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1993.06.30

영문 초록

Lower Ordovician rock samples were collected from 23 sites located at the Okcheon non-metamorphic zone, near Taeback and Yeongweol areas, southern part of the Korean Peninsula. A characteristic magnetic component was obtained from four sites. This stable direction (Dm= -19.4°, Im=24.1°) which is carried by hematite of very high temperature (679℃), successfully pass both of reversal test and paleopole reliability test, and is regarded as a primary direction. The remagnetized components can be divided into three on the basis of their characteristic directions and magnetic minerals. The first which is carried by hematite, magnetite and pyrrhotite, is widely found at the whole sites. It shows syn- or post-tectonic remagnetization according to strongly negative fold test and distribution between Mesozoic and present field directions. The second, in situ, is distinguishable from the present field direction. After bedding correction, it is identical to Late Triassic to Early Jurassic direction. Its magnetic carrier is considered to be a single component hematite, which may be acquired by pre-tectonic CRM in the Okcheon orogenic zone. The third, which is carried by magnetite and hematite, is characterized by stable reversed direction. These minerals may be acquired by the thermal or chemical process in unknown period. Paleopole position is 169.2°E in longitude and 59.9°S in latitude, which indicates that the study area was located at 12.6°S in paled-latitude and belonged to northern end of the Gondwana in Early Ordovician.

목차

ABSTRACT

서론

지질 및 시료채취

소자 실험 및 잔류자기 측정

결과 및 해석

재자화 기구에 대한 토론

결론

참고문헌