The Tectonic Zones of Northeastern USSR and the Formation of its Continental Crust

  • N. A. Shilo
  • S. M. Til’man
Chapter

Abstract

Geosynclinal development has been envisioned as a complicated and manystage process similar to that of the transformation of oceanic-type crust into continental crust (Peive, 1969; Peive et al., 1971, 1972) and takes place both in primary and in secondary or regenerated eugeosynclines. Three main stages of eugeosynclinal development—oceanic, transitional, and continental—are recognized by their characteristic sets of magmatic and sedimentary formations. The oceanic stage is often, but not always, preceded by graben formation (Dewey and Bird, 1971). The grabens appear when geosynclines are formed in rift zones evolving within preexisting continental crust. Graben-stage rock complexes include mottled shallow-water conglomerates of arkosic composition and trachybasaltic, trachyandesitic, rhyolitic, and dacitic lavas and tuffs. They are sometimes associated with tholeiitic basalts and diabases. Together they clearly point to the processes of crushing, melting, and reworking of the sialic crust.

Keywords

Continental Crust Outer Zone Siberian Platform Aldan Shield Sialic Crust 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • N. A. Shilo
    • 1
  • S. M. Til’man
    • 1
  1. 1.Northeast USSR Scientific Research Institute, Siberian DivisionAcademy of Sciences of the USSRMagadanUSSR

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