| 深海钻探与南海 |
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| 引用本文： | 夏戡原,黄慈流.深海钻探与南海[J].地球科学进展,1995,10(3):246-250. |
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| 作者姓名： | 夏戡原 黄慈流 |
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| 作者单位： | 中国科学院南海海洋研究所 |
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| 摘 要： | 本文从南海北部陆缘，南部陆缘和南海中央海盆的地质构造与地球物理主要特下及尚未解决的重要地质问题来阐述在南海进行深海钻探的意义。南海北部陆缘是离散型大陆边缘，在陆壳与洋壳之间的磁静区是两者的过渡区。对它的研究直接关系到南海的形成演化与沉积盆地的成因，深海钻探需要解决的主要问题是了解磁静区基底下的物质是减薄的过渡壳还是古洋壳。地海南部南缘与北部陆缘不同，是聚敛型大陆边缘，它的构造与地球物理场特征与北部
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| 关 键 词： | 大洋钻探 大陆边缘 构造层 南海 深海钻探 |
OCEAN DRILLING PKOGRAM AND THE SOUTH CHINA SEA |
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| Xia Kanyuan,Huang Ciliu.OCEAN DRILLING PKOGRAM AND THE SOUTH CHINA SEA[J].Advance in Earth Sciences,1995,10(3):246-250. |
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| Authors: | Xia Kanyuan Huang Ciliu |
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| Institution: | South China Sea Institute of Oceanology,Academia Sinica,Guanzhoug 510301 |
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| Abstract: | The paper discusses the significance of proposed ocean drilling sites in the South Chi-na Sea(SCS)on the bases of geological and geophysical characteristics of the northern andthe southern continental margins and the central basin of the SCS , as well as unresolvedtectonic problems for the area. The northern continental margin of the SCS is a divergent one. In between the conti-nental and oceanic crusts there is a magnetic quiet zone , with southward thinning uppercrust and lower crust. The proposed drilling sites are to investigate the materials underly-ing the magnetic quiet zone and the nature of this zone. The southern continental margin of the SCS is a convergent one,in contrast with thenorthern margin in structural and geophysical styles. Drillings in the southern margin havebeen concentrated in the shelf areas to the south. It is necessary to drill the Nansha area(the Dangerous Grounds)in order to understand the tectonic evolution of the entire south-ern margin. Major objectives of the proposed drilling sites are to study Tertiary and pre-Tertiary stratigraphy and material source of the area. In cooperation with the scientists from the Tokyo University ,we surveyed the north-ern portion of the central basin of the SCS with a three-axial magnetometer, Results showmagnetic anomalies 11 to 7 with nearly E-W orientation,and anomalies 6 to 5e with a NEorientation. In the SW subbasin of the SCS, magnetic anomalies strike in a NE direction.Drilling sites in these areas are proposed to determine the ages of these magnetic anomaliesand the materials of the oceanic crust of the SCS. |
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| Keywords: | Divergent continental margin Convergent continental margin Magneticquiet zone Three-axial magnetic survey Tectono-stratigraphic unit Detachment fault |
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