| 南海西北部重磁场及深部构造特征 |
| |
| 引用本文： | 杨恬,吴世敏,刘海龄,周蒂.南海西北部重磁场及深部构造特征[J].大地构造与成矿学,2005,29(3):364-370. |
| |
| 作者姓名： | 杨恬 吴世敏 刘海龄 周蒂 |
| |
| 作者单位： | 中国科学院,边缘海地质重点实验室,中国科学院,南海海洋研究所,广东,广州,510301 |
| |
| 基金项目： | 国家重点基础研究发展计划(973计划)，科技部科研院所社会公益研究专项基金，中国科学院资助项目 |
| |
| 摘 要： | 通过对南海重磁数据的重新处理,得到南海西北部自由空间重力异常图、布格重力异常图、磁异常图和化极磁异常图,并对所反映的地球物理场特征加以分析。根据重力场资料对研究区的地壳结构进行了反演计算,结果表明地壳厚度在10～38km之间,总的趋势由陆向洋逐渐减薄,对应于地壳类型从陆壳、过渡壳到洋壳的分布特征。根据磁力资料计算了居里面深度,其埋深变化于11～27km之间,在陆区居里面是下地壳顶界面和莫霍面之间的另一个物性界面,而在海区则接近于莫霍面埋深。
|
| 关 键 词： | 地球物理场特征 南海西北部 莫霍面 居里面 |
| 文章编号： | 1001-1552(2005)03-0364-07 |
| 收稿时间： | 2005-04-12 |
| 修稿时间： | 2005年4月12日 |
CHARACTERISTICS OF GEOPHYSICAL FIELDS AND DEEP STRUCTURES OF NORTHWESTERN SOUTH CHINA SEA |
| |
| YANG Tian,Wu Shimin,LIU Hailing,ZHOU Di.CHARACTERISTICS OF GEOPHYSICAL FIELDS AND DEEP STRUCTURES OF NORTHWESTERN SOUTH CHINA SEA[J].Geotectonica et Metallogenia,2005,29(3):364-370. |
| |
| Authors: | YANG Tian Wu Shimin LIU Hailing ZHOU Di |
| |
| Abstract: | On the basis of processing of geophysical data on northwestern South China Sea, map of free air gravity anomalies, Bouguer gravity anomalies, magnetic anomalies, the RTP magnetic anomalies were obtained, and the characteristics of the geophysical fields in this area were analyzed. Inverted calculation was conducted on the crustal structure of the study area based on gravity data. The results show that the Moho depth varied from 38 km to 10 km from north to south, which indicates that the crust changed from continental to transitional and finally to oceanic.The Curie interface depth was calculated based on the magnetic data, and the results show that the Curie interface depth varied from 11 to 27 kin. The Curie interface ranges between the top interface of lower crust and the Moho discontinuity below the land, but is near the Moho discontinuity below the ocean. |
| |
| Keywords: | characteristic of geophysical field northwestern South China Sea Moho discontinuity Curie interface |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
