| 威德尔海的重磁场特征及其构造意义 |
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| 基金项目： | Project supported by the Chinese Polar Environment Comprehensive Investigation & Assessment Programmmes Chinese Polar Environment Comprehensive Investigation & Assessment Programmmes “Marine geophysical survey in the Antarctic; Comprehensive analysis and evaluation of geological tectonic environment in the Antarctic”（No.CHINARE2012-2016:01-03,04-01） |
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| 摘 要： | 威德尔海是南极洲最大的边缘海。通过搜集威德尔海的重磁资料、历史文献以及总结前人的相关研究成果,介绍了威德尔海的重磁场基本特征以及指示的构造意义。威德尔海最显著的重力特征是在威德尔海的中北部分布着以鲱骨式结构展布的一系列NW-SE向重力异常,其上可见一系列弧形、上凹的以E-W为主要方向的磁力异常。沿南极半岛陆架边缘的重力高一直可延伸到南侧海域,高值区与陆架平行,但是在磁异常上反映不明显。威德尔海原始海盆的形成约在150 Ma,并伴随南北向张裂,随后在140 Ma发生东西向扩张,到约120 Ma异常形成现代南极洲、非洲和南美洲板块的分布格局,鲱骨式结构异常脊也形成于该时期。
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Gravity and Magnetic Characteristics of the Weddell Sea and Its Tectonic Significance |
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| Authors: | Hu Yi Wang Liming Zhong Guicai Fang Xudong Xu Jiang He Huiyou |
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| Institution: | 1.Third Institute of 0ceanography, State Oceanic Administration, Coast and Ocean Environmental Geology Open Laboratory, Xiamen 361005, China;2.Maiqin Nengyuan Jishu Fuwu Limited Liability Company, Beijing 100004, China |
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| Abstract: | The Weddell Sea is the largest marginal sea in the Antarctic. Gravity and magnetic data,historical documents and the research products of tectonic evolution of the Weddell Sea have been comprehensively collected in order to describe the characteristics of magnetic and gravity fields and the opening history. In the north and central Weddell Sea, the gravity field is characterized by a dominant “herringbone” pattern of evenly spaced NW-SE trending fracture zones. A series of curving, concave up, predominantly east-west trending magnetic anomaly are lying on the Weddell Sea gravity herringbone. The continental shelf edge of the Weddell Sea is well marked by the prominent gravity anomaly high till the southern edge of the Weddell Sea. However, the magnetic anomaly is different in western edge and the southern edge of the Weddell Sea. The initial north-south rifting and opening of the proto-Weddell Sea has already occurred (150 Ma), then the transition to east-west spreading has occurred (140 Ma), African and South American system is well established in about 120 Ma. The spine of the Weddell herringbone of formed during that time. |
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| Keywords: | Gravity anomalies Weddell Sea Magnetic anomalies Tectonics Antarctica |
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