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- Pettersson, Carl-Henrik, et al.
(författare)
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Detrital zircon U-Pb ages of Late Silurian and Early Devonian sedimentary sequences from Northwestern, Svalbard, implications for regional correlations in the Arctic Caledonides
- 2008
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In the North Atlantic region, Caledonian and Grenvillian terrains are exposed on Svalbard, Greenland, Great Britain, Canada and Scandinavia. Reconstructing the original configuration of these terrains depends partly on determining the age and provenance of the sedimentary rocks overlying the basement. Provenance investigations using detrital zircon U-Pb ages are a powerful tool to explore the palaeogeography and can yield important information how the North Atlantic region evolved through the Grenvillian and Caledonian orogenies. U-Pb laser ablation ICP-MS provenance study of zircons from Late Silurian and Early Devonian coarse siliciclastics of NW Svalbard indicate an east Greenland provenance. The decrease in 410-440 Ma ages and 2600-2800 Ma ages, combined with a large increase in 950-1000 Ma ages up-section suggests that sediment detritus was initially derived from exhumation of the Caledonian Orogen and subsequently from the Grenvillain Orogen.
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- Pettersson, Carl-Henrik, et al.
(författare)
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U-Pb Zircon Provenance of Metasedimentary Basement of the Northwestern Terrane, Svalbard : A central East Greenland correlation
- 2007
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Svalbard’s Caledonian and older bedrock consists of three main exotic terranes separated by north-south trending strike-slip faults. Early in the 19th century Kulling (1930, 1934) noted the striking similarity between the Neoproterozoic and Early Paleozoic sedimentary rocks from East Greenland and Svalbard’s Eastern Terrane. After this pioneering work Harland et al. (1969) documented their remarkable similarities through detailed stratigraphic correlation of Neoproterozoic and Early Paleozoic sedimentary rocks. Recent work in the Northwestern and the eastern part of the Eastern terrane shows that this metasedimentary basement has a strong resemblance to the Krummedal and Smallefjord sequences of central East Greenland, with Grenville age (sensu lato) granitoid intrusion followed by Caledonian migmatization and granite genesis. We present the first LA-ICP-MS U-Pb zircon provenance study on quartzites and mica schists from the Kongsfjorden Group of the Northwestern Terrane of Svalbard. These results indicate a strong correlation with the Krummedal of central East Greenland and help to constrain paleogeographic reconstructions of the Northwestern Terrane.
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