Abstract
Abstract. The lithospheric mantle structure of the Antarctic continent is of great significance of studying the polymerization and fragmentation mechanism of Gondwana and the plate movement law. Long-period magnetotelluric (LMT) is an important method to study the electrical structure of earth crust and mantle. However, been limited by the bad natural environment and logistics supply difficulties, there is no LMT record of Antarctica before. In 2018, China's 34th Antarctic scientific expedition carried out the LMT survey at the eastern edge of the Antarctic continent with a frequency range of 0.00015 Hz to 0.1 Hz. After the processing and analysis, we get three points as fellow: (1) The lithospheric mantle of Antarctica has a three-dimensional resistivity structure; (2) There are low resistivity regions in the Antarctic mantle, which may be related to thermal activity. (3) It is possible to carry out LMT measurements in eastern Antarctic and more can be done in the future.
Highlights
The Antarctic continent are the central block of all the fragmented blocks of Gondwana, which is adjacent to other blocks(such as Africa, India, and Australia) before the disintegration of Gondwana in the late Mesozoic(An et al, 2015; Torsvik et al, 2010)
The lithospheric mantle structure of the Antarctic continent is of great significance of studying the polymerization and fragmentation mechanism of Gondwana and the plate movement law(Michaux, 2009; Sutherland and Cooper, 2008)
This paper introduces the Long-period magnetotelluric (LMT) measurement of China's 34th Antarctic expedition to 2018 at the edge of ice sheet in east antarctica
Summary
The Antarctic continent are the central block of all the fragmented blocks of Gondwana, which is adjacent to other blocks(such as Africa, India, and Australia) before the disintegration of Gondwana in the late Mesozoic(An et al, 2015; Torsvik et al, 2010). The lithospheric mantle structure of the Antarctic continent is of great significance of studying the polymerization and fragmentation mechanism of Gondwana and the plate movement law(Michaux, 2009; Sutherland and Cooper, 2008). Magnetotelluric(MT) is an important geophysical technique for investigating sub-ice structure of Antarctica, which has the advantages of wide detection frequency band, not easy to be shielded by high resistivity layer, high resolution to low resistivity abnormal body, simple field construction layout and minimal environmental impact(Peacock and Selway, 2016). In 2004, they collected high-quality MT data onto the eastern Antarctica, which proved the feasibility of MT data collection of the whole Antarctic region(Wannamaker et al, 2004). Long-period magnetotelluric (LMT) can be used to study the electrical structure of earth crust and mantle(Lizarralde et al, 1995; Mackie et al, 1988; Unsworth et al, 2005)
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