뉴헤브리디스 해분의 지질학적 특징에 관한 연구

• 영문명: Geological characteristics of the New Hebrides Basin
• 발행기관: 대전대학교 환경문제연구소
• 저자명: 박충화(Chung-Hwa Park)
• 간행물 정보: 『環境問題硏究所 論文集』第2號, 91~103쪽, 전체 13쪽
• 주제분류: 공학 > 환경공학
• 파일형태: PDF
• 발행일자: 1997.02.28

영문 초록

The New Hebrides Basin is an inactive non back-arc basin located at the convergent boundary of the Pacific and lndo-Australian plates. This basin was formed from 46 Ma to 60 Ma. The basin has two spreading episodes with rates of 34 mm/a for 42 to 47 Ma and 17 mm/a for 47 to 60 Ma. The sediments covered in the basin has uniform thickness of 0.65 sec. The age-depth correlation curve of the New Hebrides Basin can be represented by the following equation : Depth (m) = 2689 + 312 √Age (Ma) The coefficient of 312 in this equation is close to that for major oceans, 350. This suggests that the cooling processes of the lithospheres in the New Hebrides Basin and major oceans are similar to each other. Free-air gravity anomalies of the basin varying from -22.3 mgal to 59.0 mgal. The mean value is 30.2 mgal higher than those of the normal oceans. Moderately large free-air gravity anomalies in the New Hebrides Basin are presumably owing to its location on a marginal swell along the New Hebrides Trench. It is generally observed that the ocean floor is very gently uplifted in a zone about 200 km oceanward of the trench axis. Positive free-air gravity anomalies amounting to 50-60 mgal are usuaJly observed on the crest of the swell. This topography is presumably by bending of the oceanic lithosphere so as to dynamically maintain nonisostatic states for some duration.

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ABSTRACT

1. 서론

2. 연구방법

3. 연구결과

4. 논의

5. 결론

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