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Provenance of Late Paleozoic-Mesozoic sandstones, Taimyr Peninsula, Arctic
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The sedimentary and provenance characteristics of seven Permo-Carboniferous and two early Cretaceous samples from the Taimyr Peninsula provide information about the latest evolution of Uralian Orogeny. The Permo-Carboniferous samples have a mixed provenance of recycled and first cycle sediment, sourced from metamorphic and igneous terranes. U-Pb detrital zircon ages represent a mixture of Precambrian-Paleozoic grains with euhedral, penecontemporaneous late Carboniferous and Permian grains consistent with derivation from the Uralian and Timanian orogens, plus additional Caledonian material presumably derived from Baltica. There are distinct differences between the late Permian sample and the other Carboniferous and early Permian samples, interpreted to reflect the final collisional stage of Uralian Orogeny. Early Cretaceous sediments deposited when the Amerasian Basin opened preserve a mixed provenance of metamorphic and igneous source material of mainly first cycle detritus, as well as an unstable heavy mineral assemblage dominated by staurolite, suggesting local derivation. Detrital zircon ages fall almost exclusively into one late Permian-early Triassic cluster, indicating no relationship with the Cretaceous Verkhoyansk fold belt.

Keyword [en]
provenance, heavy minerals, detrital zircons, Uralian orogen
National Category
Geology
Research subject
Geology
Identifiers
URN: urn:nbn:se:su:diva-89450OAI: oai:DiVA.org:su-89450DiVA: diva2:617984
Funder
Swedish Research Council
Available from: 2013-04-25 Created: 2013-04-25 Last updated: 2015-07-27
In thesis
1. Tectonic Evolution of Taimyr in the Late Paleozoic to Mesozoic from Provenance and Thermochronological Evidence
Open this publication in new window or tab >>Tectonic Evolution of Taimyr in the Late Paleozoic to Mesozoic from Provenance and Thermochronological Evidence
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Taimyr Peninsula is a key element in the circum-Arctic region and represents thenorthern margin of the Siberian Craton. The Taimyr Peninsula is a late Paleozoic fold andthrust belt and preserves late Paleozoic through Mesozoic siliciclastic sedimentarysuccessions and providing an ideal location to investigate the Paleozoic to Mesozoictectonic evolution associated with the Uralian orogeny, the Siberian Trap magmatism andopening of Amerasia Basin within a circum-Arctic framework. Multiple methods areadopted, including petrography, heavy mineral analysis and detrital zircon U-Pbgeochronology for provenance investigation, apatite fission track dating for revealingthermal history and balanced cross section for understanding the deformation style ofTaimyr.The results of this thesis indicate that the Late Carboniferous to Permian sediments ofsouthern Taimyr were deposited in a pro-foreland basin of the Uralian orogen during theUralian orogeny. In the Triassic, the siliciclastic deposits still show a strong Uraliansignature but the initiation of Siberian Trap-related input begins to be significant. Erosionof the Uralian orogen has reached a deep metamorphic level. By Late Jurassic andCretaceous time, the deposition setting of southern Taimyr is an intracratonic basin.Erosion and input from Uralian sources waned while greater input from SiberianTrap-related rocks of the Taimyr region dominated. The Taimyr Peninsula underwent atleast three cooling and uplifting episodes: 280 Ma, 250 Ma and 220 Ma, corresponding tothe Uralian orogeny, the Siberian Traps and the late Triassic transpression.

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, 2015. 28 p.
Series
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 359
Keyword
Taimyr, sandstones, provenance, heavy mineral analysis, detrital zircon, apatite fission track, tectonic setting, uplift
National Category
Geology
Research subject
Geology
Identifiers
urn:nbn:se:su:diva-119046 (URN)978-91-7649-212-3 (ISBN)
Public defence
2015-09-16, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 2: In press. Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2015-08-25 Created: 2015-07-27 Last updated: 2015-09-01Bibliographically approved

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