Mathematics – Logic
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rpesc.......42f&link_type=abstract
In its USSR Report: Earth Sciences (JPRS-UES-86-001) p 42 (SEE N86-20887 11-42) Transl. into ENGLISH from Geotektonika (Moscow,
Mathematics
Logic
Calderas, Earth Crust, Earth Mantle, Geological Faults, Magma, Structural Properties (Geology), Tectonics, Volcanology, Cones (Volcanoes), Earth Planetary Structure, Geophysics, Lithosphere, Stratification, Volcanoes
Scientific paper
The relationship between Quaternary volcanoes and different elements of the present-day structure of Kamchatka was studied. On Kamachatka there are three main zones of concentration of Quaternary volcanism: middle range, central Kamchatkan depression, eastern volcanic zone. The volcanic Quaternary zones are associated with regions of downwarping with a predominant synchronous regime of transverse dilatation. The dilatation zone ensures a general rising of magma from the deep horizons where the main magma hearths are situated and the volcanotectonics reflects the life of peripheral magma hearths situated in the higher crustal horizons. The rejuvenation of the faults forming the zone and the caldera depressions from south to north is evidence of propagation of the zone in this direction. There is a geodynamic disharmony between mantle and crustal structural stages. The position of deep and peripheral magma hearths within a single volcanic zone may be related to the structural-dynamic stratification of the lithosphere. The structural-dynamic conditions beneath the volcanic zone are considerably more complex than would be surmised from simple subduction of an oceanic plate beneath an island arc.
Florenskiy I. V.
Trifonov V. G.
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