uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Geology of the Severnaya Zemlya Archipelago and the North Kara Terrane in the Russian high Arctic
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Orogen Dynamik)ORCID iD: 0000-0001-6095-2941
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Orogen Dynamik)
2008 (English)In: International journal of earth sciences, ISSN 1437-3254, E-ISSN 1437-3262, Vol. 87, no 3, 519-547 p.Article in journal (Refereed) Published
Abstract [en]

The Severnaya Zemlya Archipelago is located at 80 degrees N near the continental shelf break, between the Kara and Laptev seas. Sedimentary successions of Neoproterozoic and Palaeozoic age dominate the bedrock geology. Together with Northern Tajmyr, Severnaya Zemlya constitutes the main land areas of the North Kara Terrane (NKT), which is inferred here to have been a part of the Timanide margin of Baltica, i.e. an integral part of Baltica at least since the Vendian. Vendian turbidites derived from the Timanide Orogen are inferred to have been deposited on Neoproterozoic greenschist facies, granite-intruded basement. Shallow-water siliclastic deposition in the Early to Mid-Cambrian was followed by highly organic-rich shales in the Late Cambrian and influx of more turbidites. An episode of folding, the Kan'on River deformation, separates these formations from the overlying Tremadocian conglomerates and sandstones. In the Early Ordovician, rift-related magmatic rocks accompanied the deposition of variegated marls, sandstones, carbonates and evaporites. Dark shales and gypsiferous limestones characterise the Mid-Ordovician. Late Ordovician quartz-sandstones mark a hiatus, followed by carbonate rocks that extend up into and through most of the Silurian. The latter give way upwards into Old Red Sandstones, which are inferred to have been deposited in a Caledonian foreland basin. Deformation, reaching the area in the latest Devonian or earliest Carboniferous and referred to as the Severnaya Zemlya episode, is thought to be Caledonian-related. The dominating E-vergent structure was controlled by decollement zones in Ordovician evaporite-bearing strata; detachment folds and thrusts developed in the west and were apparently impeded by a barrier of Ordovician igneous rocks in the east. Below the decollement zones, the Neoproterozoic to Early Ordovician succession was deformed into open to close folds. The exposed strata in the lower structural level have been juxtaposed with those in the upper structural level along the major N-trending Fiordovoe Lake Fault Zone, which involved several kilometres of dextral strike-slip movement and downthrow to the west. A major Early Carboniferous unconformity separates the folded Mid-Palaeozoic and older rocks from overlying Carboniferous formations, as on Franz Joseph Land and Svalbard. Subsequent latest Palaeozoic to Early Mesozoic orogeny, as on Taimyr, apparently had little influence on the Severnaya Zemlya successions.

Place, publisher, year, edition, pages
2008. Vol. 87, no 3, 519-547 p.
Keyword [en]
Geology, Tectonics, Caledonian, Severnaya Zemlya, Baltica
National Category
URN: urn:nbn:se:uu:diva-93215DOI: 10.1007/s00531-007-0182-2ISI: 000254903800005OAI: oai:DiVA.org:uu-93215DiVA: diva2:166628
Available from: 2005-05-11 Created: 2005-05-11 Last updated: 2015-07-21
In thesis
1. Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica
Open this publication in new window or tab >>Eurasian Arctic Tectonics: Geology of Severnaya Zemlya (North Kara Terrane) and Relationships to the Timanide Margin of Baltica
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The North Kara Terrane (NKT), with Severnaya Zemlya as its main outcrop area, constitutes the Palaeozoic and older rocks of the northern part of the Kara Shelf. Potential field data suggest a continuation into the eastern Barents Shelf. Several lines of evidence imply that the NKT was a part of Baltica at least during the latter part of the Neoproterozoic, and probably was influenced by Timanian orogeny.

The Timanide type area is characterised by metaturbidites from the pre-Timanian passive margin of the East European Craton (EEC). Regional amphibolite facies metamorphism, as exposed on Kanin Peninsula, was probably followed by near-isothermal decompression. It is inferred that these conditions were reached by depression beneath the accreted outboard terranes. Subsequently, the metaturbidites were thrust into their present position onto the EEC’s pericratonic unmetamorphosed shelf sediments. The thrusting was accompanied by rapid exhumation. About 560 Ma late-orogenic granites intrude the Timanian accreted terranes.

On Severnaya Zemlya, Neoproterozoic turbidites, containing ca. 560 Ma zircons, are overlain by shelf deposits, which dominate the Palaeozoic until the end of the Silurian. The succession is interrupted by the regional Kan’on (canyon) River Unconformity and probably by a late Neoproterozoic unconformity. New U-Th-Pb ion-microprobe isotope-ages on volcanics and faunal evidence imply that the Kan'on River Unconformity developed in a short time span around the Cambrian-Ordovician boundary. Other isotope-ages demonstrate that intense igneous activity, which has been inferred to be related to rifting within the NKT, extended into the Arenig and was contemporaneous with the development of Baltica’s northeastern passive margin. Zircon xenocrysts (ca. 540 - 580 Ma) in these igneous rocks indicate a Timanian component in the crust below the Severnaya Zemlya Archipelago. In the latest Silurian, Old Red Sandstone facies sedimentation began with the migration of an inferred Caledonian foreland basin into the area of Severnaya Zemlya. The Caledonian deformation front overrode the area in the latest Devonian or earliest Carboniferous.

The inferred late Caledonian deformation terminated, according to biostratigraphy and new isotope-ages from Bol'shevik Island granites, before the end of the Visean (ca. 345 Ma). Thus, the Uralian collision between the NKT and Siberia (ca. 300 Ma) apparently did not affect the Severnaya Zemlya Archipelago.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. viii + 93 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 68
Earth sciences, Arctic, Severnaya Zemlya, North Kara Terrane, Baltica, bedrock, geology, tectonics, Timanides, Caledonides, Geovetenskap
National Category
Earth and Related Environmental Sciences
urn:nbn:se:uu:diva-5851 (URN)91-554-6286-3 (ISBN)
Public defence
2005-06-03, Axel Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00
Available from: 2005-05-11 Created: 2005-05-11Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Lorenz, Henning
By organisation
Department of Earth Sciences
In the same journal
International journal of earth sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 257 hits
ReferencesLink to record
Permanent link

Direct link