南海北部陆缘的磁异常特征及居里面深度

吴招才; 高金耀; 赵俐红; 张涛; 杨春国; 王健

doi:10.3799/dqkx.2010.120

南海北部陆缘的磁异常特征及居里面深度

doi: 10.3799/dqkx.2010.120

吴招才^1,,
高金耀¹,
赵俐红^{1, 3},
张涛¹,
杨春国¹,
王健²

1.
国家海洋局海底科学重点实验室，国家海洋局第二海洋研究所，浙江杭州 310012
2.
中国地质大学资源学院海洋科学与工程系，湖北武汉 430074
3.
山东科技大学，山东青岛 266510

基金项目:

国家自然科学基金项目 41006035

国家自然科学基金项目 40776036

国家重点基础研究发展计划项目 2007CB411702

我国近海海洋综合调查与评价专项 908-ZC-Ⅰ-06

详细信息

作者简介:
吴招才(1980-)，男，助研，博士，从事海洋地球物理和海底构造研究.E-mail: wzc_dh@163.com

中图分类号: P631
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出版历程
- 收稿日期: 2010-03-20
- 刊出日期: 2010-11-01

Characteristic of Magnetic Anomalies and Curie Point Depth at Northern Continental Margin of the South China Sea

1.
Key Laboratory of Submarine Geosciences of SOA, Second Institute of Oceanography, SOA, Hangzhou 310012, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Shandong University of Science and Technology, Qingdao 266510, China

摘要

摘要: 为了研究南海北部张裂大陆边缘的地壳热结构，利用船载测量磁力数据，通过功率谱方法反演南海北部陆缘居里等温面，并结合深地震剖面、区域断裂及大地热流分布，讨论了深部热结构状态.结果显示研究区居里面深度在13~26 km之间，在上下陆坡转换带处与莫霍面相交，北东向断裂多位于居里面梯度带上，北西向断裂多具有分割、错断的特点，居里面深度和大地热流值具有相关性.结果揭示了陆架、上陆坡地区磁性体可能主要位于上地壳和下地壳上部，下陆坡及洋壳区地壳与地幔顶部有被磁化的迹象.磁静区位于居里面上隆区边缘，F3断裂和F4断裂之间可能是残留古洋壳.潮汕凹陷和台西南盆地中央隆起是发生底侵的主要区域，F2断裂为其北界.
- 南海 /
- 居里面深度 /
- 功率谱分析 /
- 磁异常 /
- 热流
Abstract: In order to investigate thermal state of crust in northern continental margin of the South China Sea, we calculated the Curie point depths with the shipboard magnetic anomaly by employing the method of power-density spectrum analysis. Combining with the seismic section, faults, and the heat flow distribution, the deep thermal structure was discussed in the study area. The result shows that Curie point depths were between 13 and 26 km. NE-directed faults were mostly distributed in the gradient belt of Curie point isotherm, while NW-directed faults had the features of segmentation and fragment. The correlations were apparent between the Curie point depths and heat flow data. It reveals that magnetic bodies in shelf and upper slope were mostly distributed over upper crust and upper part of lower crust; and the crust and the top of mantle in under slope and the oceanic areas were subject to magnetization. Magnetic quiet zone was located at the margin of the uplift of the Curie point isotherm. Residue ancient oceanic crusts extended from F3 fault to F4 fault. Chaoshan depression and centre uplift of the Southwest Taiwan basin were the main areas of underplating, and F2 fault was the north boundary.
- South China Sea /
- Curie pointdepth /
- spectral analysis /
- magnetic anomaly /
- heat flow

HTML全文

图 1 南海北部陆缘磁异常(△T)

Fig. 1. Magnetic anomalies of the Northeast South China Sea

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图 2 频谱分析

虚线、点划线和实线依次是四阶、五阶和六阶细节的平均径向能谱曲线

Fig. 2. Map of spectral analysis

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图 3 南海北部陆缘磁异常四阶小波细节

Fig. 3. 4th-order wavelet detail of magnetic anomalies

下载: 全尺寸图片幻灯片

图 4 居里面深度

Fig. 4. Curie point isotherms

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图 5 OBS93速度结构剖面与重磁、居里面深度及大地热流值对照

Fig. 5. OBS93 velocity section and its magnetic anomaly, Curie point isotherms and heat flow profile

下载: 全尺寸图片幻灯片

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