Gravity and Magnetic Characteristics of the Weddell Sea and Its Tectonic Significance

doi:10.11867/j.issn.1001-8166.2015.11.1231

Advances in Earth Science ›› 2015, Vol. 30 ›› Issue (11): 1231-1238. doi: 10.11867/j.issn.1001-8166.2015.11.1231

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Gravity and Magnetic Characteristics of the Weddell Sea and Its Tectonic Significance

Hu Yi ¹, Wang Liming ¹, Zhong Guicai ¹, Fang Xudong ¹, Xu Jiang ¹, He Huiyou ²

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

Received:2015-08-10 Revised:2015-10-12 Online:2015-11-20 Published:2015-11-20
About author:First author: Hu Yi(1976-),male, Xiangxiang City, Hu’nan Province, Senior Engineer. Research area include marine geology and geophysics. E-mail: huyi@tio.org.cn
Supported by:
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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Hu Yi, Wang Liming, Zhong Guicai, Fang Xudong, Xu Jiang, He Huiyou. Gravity and Magnetic Characteristics of the Weddell Sea and Its Tectonic Significance[J]. Advances in Earth Science, 2015, 30(11): 1231-1238.

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 Gravity and magnetic data,historical documents and the research products of tectonic evolution of the Weddell Sea have been comprehensively collected in order to describe the characteristics of magnetic and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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