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U-Pb zircon provenance of metasedimentary basement of the Northwestern Terrane, Svalbard: Implications for the Grenvillian–Sveconorwegian orogenyand development of Rodinia
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologi och geokemi.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för geologi och geokemi.ORCID-id: 0000-0003-0498-1849
2009 (Engelska)Ingår i: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 175, nr 1-4, s. 206-220Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Svalbard is pivotal for defining the northern extent of the Grenville/Sveconorwegian orogenic belt. Consequently, to constrain the origin of Svalbard’s Northwestern Terrane (NWT), detrital zircon populations from samples of the Krossfjorden Group and Smerenburgfjorden complex, northwestern Svalbard, were analyzed by U-Pb Laser ablation ICP-MS. These data indicate that the NWT’s metasedimentary basement, the Krossfjorden Group, was deposited between c. 1020-995 Ma and indicates that the Smerenburgfjorden complex may represent a migmatized and deformed part of the Krossfjorden Group. Statistically, the source area of the Krossfjorden Group can not be distinguished from other late Mesoproterozoic to early Neoproterozoic siliciclastic sequences exposed in the Caledonian orogenic belt and their detrital populations are compatible with derivation from the Eastern Grenville Province (EGP), dominated by ages coinciding with the Labradorian event (1710-1600 Ma). The diachronous tectonothermal evolution of these Meso-to Neoproterozoic metasedimentary sequences suggests deposition in a spatially linked peripheral foreland and remnant ocean basins located east of EGP, which migrated eastwards during the final suturing of Rodina. Thus, they do not represent a northern branch of the Grenvillian/Sveconorwegian Orogeny.

Ort, förlag, år, upplaga, sidor
2009. Vol. 175, nr 1-4, s. 206-220
Nyckelord [en]
Svalbard, Rodinia, Laurentia, Zircon, Provenance
Nationell ämneskategori
Geologi
Forskningsämne
geologi
Identifikatorer
URN: urn:nbn:se:su:diva-32793DOI: 10.1016/j.precamres.2009.09.010ISI: 000272427700013OAI: oai:DiVA.org:su-32793DiVA, id: diva2:281561
Tillgänglig från: 2009-12-16 Skapad: 2009-12-16 Senast uppdaterad: 2020-02-06Bibliografiskt granskad
Ingår i avhandling
1. The tectonic evolution of northwest Svalbard
Öppna denna publikation i ny flik eller fönster >>The tectonic evolution of northwest Svalbard
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Geological Sciences, Stockholm University, 2010. s. 22
Serie
Meddelanden från Stockholms universitets institution för geologiska vetenskaper ; 339
Nyckelord
Svalbard, Rodinia, Laurentia, Zircon, Provenance, Migmatites, Clockwise P-T
Nationell ämneskategori
Geologi
Forskningsämne
geologi
Identifikatorer
urn:nbn:se:su:diva-39364 (URN)978-91-7447-056-7 (ISBN)
Disputation
2010-06-24, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Anmärkning
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.Tillgänglig från: 2010-05-23 Skapad: 2010-05-18 Senast uppdaterad: 2010-08-04Bibliografiskt granskad

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