极地研究

极地研究 ›› 1995, Vol. 6 ›› Issue (1-English): 12-23.

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The characteristics of geophysical field and tectonic evolution in the Bransfield Strait

 Yao Bochu, Wang Guangyu, Chen Bangyan and Chen Shengyuan   

  1. Guangzhou Marine Geological Survey, Ministry of Geology and Mineral Resource, Guangzhou 510075, China
  • 出版日期:1945-03-30 发布日期:1945-03-30
  • 通讯作者: Yao Bochu
  • 基金资助:

    The project is supported by the State Antarctic Committee of China.

The characteristics of geophysical field and tectonic evolution in the Bransfield Strait

 Yao Bochu, Wang Guangyu, Chen Bangyan and Chen Shengyuan   

  1. Guangzhou Marine Geological Survey, Ministry of Geology and Mineral Resource, Guangzhou 510075, China
  • Online:1945-03-30 Published:1945-03-30
  • Contact: Yao Bochu
  • Supported by:

    The project is supported by the State Antarctic Committee of China.

PDF (PC)

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摘要：

Having analysised the data collected by our survey ship "Ocean IV" in the Bransfield Strait in 1991,we recognized that the geomorphology,gravity and magnetic anomalies trending NE direction along bandings. The sediments in the Bransfield Strait can be subdivided into two sequences:the first rifting equence and the second rifting sequence.The basement was faulted into a half-graben in northwestern side of the Bransfield trough. Considering the crustal structure crossing the South Shetland Islands,the Bransfield Strait and the Antarctic Peninsula, we propse a two-phase rifting tectonic evolution model and a layered-shear model for the lithospheric deformation under the effects of extensional stress field.

关键词: geophysical field, crustal structure, tectonic evolution, layered-shear model

Abstract:

Having analysised the data collected by our survey ship "Ocean IV" in the Bransfield Strait in 1991,we recognized that the geomorphology,gravity and magnetic anomalies trending NE direction along bandings. The sediments in the Bransfield Strait can be subdivided into two sequences:the first rifting equence and the second rifting sequence.The basement was faulted into a half-graben in northwestern side of the Bransfield trough. Considering the crustal structure crossing the South Shetland Islands,the Bransfield Strait and the Antarctic Peninsula, we propse a two-phase rifting tectonic evolution model and a layered-shear model for the lithospheric deformation under the effects of extensional stress field.

Key words: geophysical field, crustal structure, tectonic evolution, layered-shear model