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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy
(S) - IASPEI - International Association of Seismology and Physics of the Earth's
Interior
JSS011 Poster presentation 2132
Geodynamics of the Active continental Margins of the Far East, Russia
Prof. Alexander Rodnikov
Geophysical Center Russian Acadehy of Sciences IAVCEI
The Geodynamics of the active continental margins of Far East (Russia) was investigated under
InterMARGINS Project along the deep sections of the tectonosphere, including the lithosphere and the
asthenosphere. A distinctive feature of the transition zone from the Eurasian continent to the Pacific
Ocean is the presence of an asthenospheric layer in the upper mantle and the upwelling of the diapirs
of a hot anomalous mantle, which controlled the formation of the geological units of the active
continental and oceanic margins. There is an obvious correlation of the geological features,
tectonomagmatic activity, and the structure of the upper mantle. The active regions, such as the island
arcs and the rifts of the marginal seas, correlate with a thick, magma-generating asthenosphere. It is
expressed in the growth of heat flow in the younger tectonic zones caused by the upwelling of
asthenospheric diapirs into the lithosphere, which involves tectonomagmatic reworking. Rifts in the
marginal seas and island arcs may by accompanied by intense mineralization. The combination of high
heat flow, volcanicity and hydrothermal activity in these structures, in the past and at present, can lead
to the formation of sulphides and other mineral deposits.
Keywords: geodynamics, lithosphere, asthenosphere