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Detrital zircon U-Pb ages of Silurian-Devonian sediments from NW Svalbard: A fragment of Avalonia and Laurentia?
Stockholm University, Faculty of Science, Department of Geology and Geochemistry. (Geology)
Stockholm University, Faculty of Science, Department of Geological Sciences. (Geology)
Geological Survey of Denmark and Greenland (GEUS), .
2010 (English)In: Journal of the Geological Society (London), Vol. 167, no 5, 1019-1032 p.Article in journal (Refereed) Published
Abstract [en]

Detrital zircon populations from Silurian-Devonian clastic rocks of NW Svalbard were analysed by U-Pb laser ablation inductively coupled plasma mass spectrometry to investigate the pre-Caledonian provenance of Svalbard's Northwestern Terrane. Changes in the resulting age spectra suggest a major shift in sources from the Laurentian-Avalonian suture in the latest Silurian to the local metasedimentary basement of the Northwestern Terrane in the Late Silurian-Early Devonian, and in the Lochkovian to Grenvillian-Sveconorwegian sources. These data, together with structural, additional geochronological and metamorphic data from Svalbard, East Greenland and Avalonia, support the amalgamation of Svalbard as the result of long-distance transport along sinistral strike-slip faults. A unifying model for the final amalgamation of Svalbard, consistent with the stratigraphical and tectonothermal history of Svalbard, involves fragments from the Grampian orogen and Avalonian crust originally accreted to the Laurentian margin being subsequently transported northward along sinistral strike-slip faults during Scandian deformation.

Place, publisher, year, edition, pages
2010. Vol. 167, no 5, 1019-1032 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-33802DOI: 10.1144/0016-76492010-062ISI: 000281190700015OAI: oai:DiVA.org:su-33802DiVA: diva2:283628
Available from: 2009-12-29 Created: 2009-12-29 Last updated: 2011-12-05Bibliographically approved
In thesis
1. The tectonic evolution of northwest Svalbard
Open this publication in new window or tab >>The tectonic evolution of northwest Svalbard
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Svalbard represents the uplifted and exhumed northwest corner of the Barents Sea Shelf. Pre-Carboniferous rocks of Svalbard are divided into the Eastern, Northwestern and Southwestern Terranes, were amalgamated during the Caledonian Orogen and are separated by north-south-trending strike-slip faults. Even though our knowledge of Svalbard’s pre-Carboniferous history has increased dramatically during the last two decades, a major issue remains: Where did the different tectonostratigraphic terranes of Svalbard originate? The answer to this question has profound significance for the entire eastern Laurentian margin, which spans two supercontinent cycles, from the amalgamation and breakup of Rodinia to the amalgamation of Pangea. This thesis constrains the tectonothermal evolution of Svalbard’s Northwestern Terrane (NWT) using ion microprobe and LA-ICP-MS U-Pb zircon geochronology and electron microprobe thermobarometry on metasediments, clastic rocks and granitoids. Detrital zircon age populations of metasediments from the NWT suggests that they (e.g. the Krossfjorden Group) were deposited at c. 1000 Ma in a remnant ocean basin setting outboard the Eastern Grenville Province and were subsequently deformed and intruded by Late Grenvillian granitoids during the final suturing of Rodinia. Thus, a northern branch of the Grenvillian/Sveconorwegian orogeny is not present. This older history of the NWT is extensively overprinted by Late Caledonian deformation and metamorphism, with peak metamorphic conditions of 850 °C at >6 kbars, and subsequent migmatization of the Krossfjorden Group at c. 420 Ma. Based on these data, together with the detrital zircon age population from overlying Late Silurian-Early Devonian clastic rocks, a unifying model is proposed involving fragments from the Grampian orogen and Avalonian crust originally accreted to the Laurentian margin, subsequently transported northwards along sinistral strike-slip faults during Scandian deformation.

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University, 2010. 22 p.
Series
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 339
Keyword
Svalbard, Rodinia, Laurentia, Zircon, Provenance, Migmatites, Clockwise P-T
National Category
Geology
Research subject
Geology
Identifiers
urn:nbn:se:su:diva-39364 (URN)978-91-7447-056-7 (ISBN)
Public defence
2010-06-24, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 4: In press.Available from: 2010-05-23 Created: 2010-05-18 Last updated: 2010-08-04Bibliographically approved

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