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Publication Detail
The Early Ordovician age of deformations in the Kokchetav subduction-collision zone: New structural and 40Ar/39Ar data
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    De Grave J, Buslov MM, Zhimulev FI, Vermeesch P, McWilliams MO, Metcalf J
  • Publication date:
    28/12/2006
  • Pagination:
    445, 454
  • Journal:
    Geologiya i Geofizika
  • Volume:
    47
  • Issue:
    4
  • Status:
    Published
  • Print ISSN:
    0016-7886
Abstract
An extensive mapping and sampling in the central Kokchetav subduction-collision zone has shown that it is a terrane of a Vendian-Cambrian paleosubduction zone made up of tectonic sheets of Precambrian granite-gneisses, Late Precambrian garnet-disthene-sillimanite-biotite schists with boudins of garnet and gamet-plagioclase amphibolites, and Cambrian mylonitized granite-gneisses with boudins of eclogites. The fault zones between tectonic sheets are formed by garnet-quartz-muscovite and quartz-muscovite schists. Along with the central Kokchetav zone, they are isoclinally overfolded southwestward. 40Ar/39Ar dating of muscovite from five mica schist samples yielded close plateau and isochron ages of 480-485 Ma (Early Ordovician). The geological and geochronological data confirm the Early Ordovician formation of the nappe-sheet structure of the Kokchetav subduction-collision zone and exhumation of UHP and HP rocks in the middle-upper crust.
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