Physics – Geophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpesc.......68k&link_type=abstract
In its USSR Rept.: Earth Sciences (JPRS-UES-84-005) p 68 (SEE N84-28132 18-42) Transl. into ENGLISH from Geotektonika (USSR), n
Physics
Geophysics
Continents, Earth Crust, Earth Mantle, Earth Planetary Structure, Geophysics, Oceans, Planetary Evolution, Convective Flow, Geomorphology, Structural Properties (Geology)
Scientific paper
The process of breakup of a continental platform with the formation of young oceans remains largely unclear, whether the breakup results from local, autonomous factors such as the ascent of a convective flow, or whether it occurs under the influence of regional stresses applied to the lithospheric plate or system of plates. In recent years tremendous amounts of geological geophysical material have been accumulated allowing, if not the solution of these problems, at least a significant narrowing of the range of research. This refers particularly to data on the formation and development of the passive margins accumulated during the scientific and prospecting drilling in the oceans. The detailed histories thus produced indicated that there are two types of rifts: (1) those formed by free floating of the fragments of large continents and (2) those formed under conditions of continental collision. In both cases extension is accompanied by passive rising of the asthenosphere, floating of the anomalous mantle and its accumulation in the base of the crust. Volcanism in rifts of the first type occurs with subsidence, in the second type both with subsidence and with upthrust. The extensions creating rifts are regional in nature. Their general cause is not precisely known although they are probably created by convective currents in the asthenosphere.
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