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地球科学进展  1995, Vol. 10 Issue (3): 246-250    DOI: 10.11867/j.issn.1001-8166.1995.03.0246
干旱气候变化与可持续发展     
深海钻探与南海
夏戳原,黄慈流
中国科学院南海海洋研究所  广州  510301
OCEAN DRILLING PROGRAM AND THE SOUTH CHINA SEA
Xia Kanyuan,Huang Ciliu
South China Sea Institute of Oceanology,Academia Sinica,Guanzhoug  510301
 全文: PDF(2471 KB)  
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征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。
    南海南部陆缘与北部陆缘不同,是聚敛型大陆边缘,它的构造与地球物理场特征与北部陆缘也不相同。钻探的目的主要是了解南沙岛礁区早第三纪与前第三纪地层特征,研究它的来源及新生代地层的含油气性。
    南海中央海盆的磁异常11—7的走向近E—W向,异常6—5e的走向为NE向。南海西南海盆的磁异常走向为NE向,因此应在上述磁异常走向不同及年龄不同海区及西南海盆进行深海钻探,确定异常的年龄及洋壳的物质组成。

关键词: 大洋钻探离散型大陆边缘聚敛型大陆边缘磁静区三分量磁测构造层拆离断层    
Abstract:

    The paper discusses the significance of proposed ocean drilling sites in the South China Sea (SCS )on the bases of geological and geophysical characteristics of the northern and the southern continental margins and the central basin of the SCS, as well as unresolved tectonic problems for the area.
    The northern continental margin of the SCS is a divergent one. In between the continental and oceanic crusts there is a magnetic quiet zone, with southward thinning upper crust and lower crust. The proposed drilling sites are to investigate the materials underlying the magnetic quiet zone and the nature of this zone.
    The southern continental margin of the SCS is a convergent one, in contrast with the northern margin in structural and geophysical styles. Drillings in the southern margin have been 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 southern 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 northern portion of the central basin of the SCS with a three-axial magnetometer. Results show magnetic anomalies 11 to 7 with nearly E-W orientation,and anomalies 6 to 5e with a NE orientation. 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 anomalies and the materials of the oceanic crust of the SCS.

Key words: Convergent continental margin    Magnetic quiet zone    Three-axial magnetic survey    Tectono-stratigraphic unit    Detachment fault.    Divergent continental margin
收稿日期: 1995-02-21 出版日期: 1995-06-01
通讯作者: 夏戡原   
作者简介: 夏戡原,男,1934年5月出生,研究员,主要从事南海及邻区区域地质及地球物理研究.
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引用本文:

夏戳原,黄慈流. 深海钻探与南海[J]. 地球科学进展, 1995, 10(3): 246-250.

Xia Kanyuan,Huang Ciliu. OCEAN DRILLING PROGRAM AND THE SOUTH CHINA SEA. Advances in Earth Science, 1995, 10(3): 246-250.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.1995.03.0246        http://www.adearth.ac.cn/CN/Y1995/V10/I3/246

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