| 利用重力梯度反演南海西南海盆深部构造 |
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| 引用本文： | 唐仁敏,张健.利用重力梯度反演南海西南海盆深部构造[J].地质力学学报,2006,12(1):49-54. |
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| 作者姓名： | 唐仁敏 张健 |
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| 作者单位： | 中国科学院研究生院地球动力学重点实验室,北京,100049 |
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| 摘 要： | 重力梯度异常反映的是重力异常的变化，其分辨率比重力异常高。重力梯度空间参量图能给出构造倾角和倾面的信息，结合重力梯度剖面和梯度空间参量图可以构建出地下构造的几何模型，进而对一些复杂构造进行解释。本文利用重力梯度异常对南海西南海盆进行了解释，得到大致以西南海盆北东向扩张轴为对称轴的穹隆状构造面。该构造面在西南海盆下6～15km处形成一个密度界面，此界面可能是西南海盆北西-南东向海底扩张期间地幔上隆所引起的。
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| 关 键 词： | 重力梯度 密度界面 西南海盆 南海 |
| 文章编号： | 1006-6616（2006）01-0049-06 |
| 收稿时间： | 2005-09-27 |
| 修稿时间： | 2005年9月27日 |
GRAVITY GRADIENT INVERSION OF DEEP STRUCTURE IN THE SOUTHWEST SEA BASIN |
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| TANG Ren-min and ZHANG Jian.GRAVITY GRADIENT INVERSION OF DEEP STRUCTURE IN THE SOUTHWEST SEA BASIN[J].Journal of Geomechanics,2006,12(1):49-54. |
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| Authors: | TANG Ren-min and ZHANG Jian |
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| Institution: | Key Laboratory of Computational Geodynamics, Graduate School, Chinese Academy of Sciences, Beijing 100049 and Key Laboratory of Computational Geodynamics, Graduate School, Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | The gravity gradient anomaly reflects the change of gravity anomaly, and it has a higher resolution than gravity anomaly. The plot of gravity gradient space parameters can give diagnostic information of dip angles and planes. A geometric model of subsurface structure may be constructed by integrating a gravity gradient section with the gravity gradient space parameter plot, and furthermore some complex structures may be interpreted. The authors used gravity gradient anomalies to interpret the Southwest sea basin of the South China Sea and obtained the domal structure plane with the NE-trending spreading axis of the sea basin as the symmetric axis. This structure plane forms a density interface 6-15 km below the sea basin, which might be caused by mantle uplift during NW-SE-trending sea floor spreading of the Southwest sea basin. |
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| Keywords: | gravity gradient structural interpretation Southwest sea basin South China Sea |
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