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The Tectonics of the Altaids: Crustal Growth During the Construction of the Continental Lithosphere of Central Asia Between ∼750 and ∼130 Ma Ago

Authors
  • Şengör, A.M. Celâl
  • Natal'in, Boris A.
  • Sunal, Gürsel
  • van der Voo, Rob
Type
Published Article
Journal
Annual Review of Earth and Planetary Sciences
Publisher
Annual Reviews
Publication Date
May 30, 2018
Volume
46
Pages
439–494
Identifiers
DOI: 10.1146/annurev-earth-060313-054826
Source
Annual Reviews
Keywords
License
Yellow

Abstract

The largest mountain belt in Central Asia (∼9 million km2) is called the Altaids. It was assembled between ∼750 and ∼130 Ma ago around the western and southern margins of the Siberian Craton, partly on an older collisional system (the “Urbaykalides”). Geological, geophysical, and geochemical data—mostly high-resolution U-Pb ages—document the growth of only three arc systems in Central and Northwest Asia during this time period, an interval throughout which there were no major arc or continental collisions in the area. While the Altaids were being constructed as a Turkic-type orogen, continental crust grew in them by 1/3 of the global total. The Altaids thus added some 3 million km2 to the continental crust over a period of 0.6 billion years, typical of Phanerozoic crustal growth rates.

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