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| Titel |
South Anyui suture: tectono-stratigraphy, deformations, and principal tectonic events |
| VerfasserIn |
S. D. Sokolov, G. Ye. Bondarenko, P. W. Layer, I. R. Kravchenko-Berezhnoy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1868-4556
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| Digitales Dokument |
URL |
| Erschienen |
In: Geology, geophysics and tectonics of Northeastern Russia: a tribute to Leonid Parfenov ; Nr. 4 (2009-09-17), S.201-221 |
| Datensatznummer |
250001448
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| Publikation (Nr.) |
 copernicus.org/smsps-4-201-2009.pdf |
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| Zusammenfassung |
| Geochronologic and structural data from the terranes of the South Anyui
suture zone record a protracted deformational history before, during and
after an Early Cretaceous collision of the passive margin of the
Chukotka-Arctic Alaska continental block with the active continental margin
of the North Asian continent. Preceding this collision, the island arc
complexes of the Yarakvaam terrane on the northern margin of the North Asian
craton record Early Carboniferous to Neocomian ages in ophiolite,
sedimentary, and volcanic rocks. Triassic to Jurassic amphibolites constrain
the timing of subduction and intraoceanic deformation along this margin. The
protracted (Neocomian to Aptian) collision of the Chukotka passive margin
with the North Asian continent is preserved in a range of structural styles
including first north verging folding, then south verging folding, and
finally late collisional dextral strike slip motions which likely record a
change from orthogonal collision to oblique collision. Due to this collision,
the southern passive margin of Chukotka was overthrust by tectonic nappes
composed of tectono-stratigraphic complexes of the South Anyui terrane.
Greenschists with ages of 115–119 Ma are related to the last stages of this
collision. The postcollisional orogenic stage (Albian to Cenomanian) is
characterized by sinistral strike slip faults and an extensional environment. |
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