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The Taimyr fold belt, Arctic Siberia: timing of prefold remagnetisation and regional tectonics
 

Summary: The Taimyr fold belt, Arctic Siberia: timing of prefold
remagnetisation and regional tectonics
Trond H. Torsvik a,b,c,*, Torgeir B. Andersen d
a
VISTA, c/o Geodynamics Centre, NGU, Leiv Eirikssons vei 39, N-7491 Trondheim, Norway
b
Department of Mineralogy and Petrology, Lund University, Lund S-222 333, Sweden
c
Institute of Petroleum Technology and Applied Geophysics, NTNU, N-7494 NTNU, Norway
d
Department of Geology, University of Oslo, P.B. 1047 Blindern, 0316 Oslo, Norway
Received 29 August 2001; accepted 9 April 2002
Abstract
Late Precambrian and Palaeozoic platform sediments from the Central­South Taimyr Peninsula (Arctic Siberia) are all
remagnetised. The remagnetisation is prefold and is related to thermal remagnetisation caused by Taimyr Trap magmatism. The
remagnetisation age is estimated to 220­230 Ma and, hence, is considerably younger than the ca. 251 Ma age for the main body
of Siberian Trap flood basalts. The folding that affected the Taimyr region platform sediments also included the Taimyr
``Traps,'' hence, relegating Taimyr deformation to post-Mid Triassic time, and most probably, to a Late Triassic age. This shows
that whilst thrusting terminated in the Urals during the Permian, crustal shortening continued in Taimyr, Novaya­Zemlya and
the South Barents Sea, well into the Mesozoic.

  

Source: Andersen, Torgeir Bjørge - Centre for Physics of Geological Processes & Department of Geosciences, Universitetet i Oslo
Torsvik, Trond Helge - Sentrum for Geodynamikk, Norges Geologiske Undersøkelse

 

Collections: Geosciences