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New geophysical data about the Pacific Margin Magnetic anomaly (PMA) sources and some features of the Western Antarctica geodynamic processes.Normal access

Authors: V.D. Soloviev, I.N. Korchagin, S.P. Levashov, N.A. Yakymchuk and D.N. Bozhezha
Event name: 16th International Conference on Geoinformatics - Theoretical and Applied Aspects
Session: Geological Modeling
Publication date: 15 May 2017
DOI: 10.3997/2214-4609.201701827
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.85Mb )
Price: € 20

Summary:
New geophysical models of the Earth's crust and upper mantle were used to study the possible nature of the Pacific Margin Anomaly (PMA) near the Antarctic Peninsula (AP). Active tectonic processes in the Mesozoic - Cenozoic resulted in the complex evolution and the magnetic sources of PMA along the AP margin forming. The PMA-batholith consists of a series of plutons with different ages, composition and magnetization. Spatial heterogeneity of the various segments of PMA can also be associated with a variety of depth, power and magnetic susceptibility of individual units that form the source of regional anomalies. It is possible that the total anomaly name (PMA) can formally integrate anomalies of different ages and origins. Numerous local young age intrusions form an additional PMA horizon of magnetized bodies associated with volcanic processes at the top of the crust. Some segments of the PMA may be associated with the processes of tectonic changes near the Antarctic - Scotia paleo-plate boundary, as well as teсtonic and magmatic processes in the areas of paleo rifts structures detection. New geophysical results for different PMA - segments from the Palmer Land to Powell Basin may generalize current ideas of sources and origin of this positive magnetic anomaly.


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