September 16 – PhD defense by Xiaojing Zhang

Tectonic Evolution of Taimyr in the Late Paleozoic to Mesozoic from Provenance and Thermochronological Evidence

by Xiaojing Zhang

Date and time: Wednesday, September 16 at 10.00 am
Place: De Geersalen, Geohuset (link to the house plan)

Supervisor: Prof. Victoria Pease
Assistant supervisor: Dr. Eve Arnold

Opponent: Prof. Arild Andresen, Department of Geosciences, University of Oslo, Norway

Examining committee:
Dr. Bernad Bingen, Geological Survey of Norway, Norway
Dr. Michael Flowerdew, Cambridge Arctic Shelf Program (CASP), UK
Prof. Uwe Ring, Department of Geological Sciences, Stockholm University, Sweden

The Taimyr Peninsula is a key element in the circum-Arctic region and represents the northern margin of the Siberian Craton. The Taimyr Peninsula is a late Paleozoic fold and thrust belt and preserves late Paleozoic through Mesozoic siliciclastic sedimentary successions and providing an ideal location to investigate the Paleozoic to Mesozoic tectonic evolution associated with the Uralian orogeny, the Siberian Trap magmatism and opening of Amerasia Basin within a circum-Arctic framework. Multiple methods are adopted, including petrography, heavy mineral analysis and detrital zircon U-Pb geochronology for provenance investigation, apatite fission track dating for revealing thermal history and balanced cross section for understanding the deformation style of Taimyr.
The results of this thesis indicate that the Late Carboniferous to Permian sediments of southern Taimyr were deposited in a pro-foreland basin of the Uralian orogen during the Uralian orogeny. In the Triassic, the siliciclastic deposits still show a strong Uralian signature but the initiation of Siberian Trap-related input begins to be significant. Erosion of the Uralian orogen has reached a deep metamorphic level. By Late Jurassic and Cretaceous time, the deposition setting of southern Taimyr is an intracratonic basin. Erosion and input from Uralian sources waned while greater input from Siberian Trap-related rocks of the Taimyr region dominated. The Taimyr Peninsula underwent at least three cooling and uplifting episodes: 280 Ma, 250 Ma and 220 Ma, corresponding to the Uralian orogeny, the Siberian Traps and the late Triassic transpression.
Keywords: Taimyr, sandstones, provenance, heavy mineral analysis, detrital zircon, apatite fission track, tectonic setting, uplift.

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