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지원사업
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커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
We present the results of the palaeomagnetic study on the Early Cretaceous sedimentary Hayang Group sampled from Yongyang area in the northeastern part of the Kyongsang basin. The sampled formations of the Hayang Group comprise the Uillyonsan, Tonghwachi, Kasongdong, Chongnyangsan, Osippong, and Togyedong Formations in ascending order. Thermal demagnetization of the samples allowed us to isolate a high-temperature ChRM component which passes positive fold and/or reversal tests except the Osippong Formation. Also the fold test of the 4 formation-mean ChRMs remains positive at the 95% confidence level indicating pre-folding primary magnetizations, with a mean direction of D=27.0°, I=56.1°, k=336, α₉₅=5.0°. The corresponding palaeopole at 68.4°N, 210.7°E (K=237.4, A₉₅=6.0°) is coherent with the palaeopoles of Hayang Group in the other parts of the Kyongsang basin. A comparison of the mean palaeomagnetic pole position from the Hayang Group of the studied area with the contemporary pole from the China west of the Tan-Lu fault shows that the Yongyang area had experienced little latitudinal displacement (1.7°±5.5°) nor vertical-axis block rotation (8.2°±6.9°) relative to the Chinese blocks since the Early Cretaceous. In regard to the magnetostratigraphic correlation of the formations indicating dual polarities, the middle Kasongdong Formation and the lower strata should be older than 120.5 Ma. The reverse polarity zone recorded in the upper Togyedong Formation correlates to the Late Aptian (M-1r) or middle Albian reverse polarity subchrons. Based on the palaeomagnetic pole position, radiometric age and field evidence, the age of basalts in the Osippong Formation has been assigned to be the upper Late Cretaceous.
본문·목차
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
최근 본 자료 전체보기
UCI(KEPA) : I410-ECN-0101-2012-450-004417402
