The formation of the modern structure of the american-antarctic ridge

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The American-Antarctic Ridge is located between Bouvet Triple Junction and South Sandwich subduction zone. It is dissected by well pronounced transform faults. The common length of transform faults exceeds the common length of spreading segments. This structure was developed as a result of extension direction change during the subduction zone reshaping ca. 20 My. Basing on physical modelling we have reconstructed the conditions and the structural transformations during formation of the modern structural pattern of the American-Antarctic Ridge. In the experiment, oblique spreading segments through local ridge axis jumps became orthogonal. In that time, transverse discontinuities increased their length owing to reduction of oblique spreading segments and merging of several pre-existing transverse discontinuities. Perhaps, similar transformations could be observed during the modern structure formation of the American-Antarctic Ridge. In the western part, oblique to suborthogonal spreading segment transition has finished, while in the eastern part, structural pattern preserves as oblique as suborthogonal spreading segments. This situation may be determined by the influence of Shona and Bouvet mantle plume thermal anomalies. Thus, at the moment in the eastern part spreading and transform structures continue reshaping, and the structural pattern of the western part is stable.

作者简介

V. Bogoliubskii

Lomonosov Moscow State University, The Earth Science Museum; Lomonosov Moscow State University, Faculty of Geology

Email: bogolubskiyv@gmail.com
Moscow, Russia; Moscow, Russia

E. Dubinin

Lomonosov Moscow State University, The Earth Science Museum; Lomonosov Moscow State University, Faculty of Geology

Moscow, Russia; Moscow, Russia

A. Grokholsky

Lomonosov Moscow State University, The Earth Science Museum

Moscow, Russia

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