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Cambrian ages for m...
Cambrian ages for metavolcanic rocks in the Lower Köli Nappes, Swedish Caledonides: implications for the status of the Virisen arc terrane
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- Carter, Isabel S. M. (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,AGH Univ Krakow, Fac Geol Geophys & Environm Protect, Al Mickiewicza 30, PL-30059 Krakow, Poland.
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- Cuthbert, Simon J. (författare)
- Faculty of Geology, Geophysics and Environmental Protection, AGH University of Kraków, al. Mickiewicza 30, 30-059 Kraków, Poland,AGH Univ Krakow, Fac Geol Geophys & Environm Protect, Al Mickiewicza 30, PL-30059 Krakow, Poland.
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- Walczak, Katarzyna (författare)
- Faculty of Geology, Geophysics and Environmental Protection, AGH University of Kraków, al. Mickiewicza 30, 30-059 Kraków, Poland,AGH Univ Krakow, Fac Geol Geophys & Environm Protect, Al Mickiewicza 30, PL-30059 Krakow, Poland.
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- Ziemniak, Grzegorz (författare)
- Institute of Geological Sciences, University of Wrocław, Pl. M. Borna 9, 50-204 Wrocław, Poland,Univ Wroclaw, Inst Geol Sci, Pl M Borna 9, PL-50204 Wroclaw, Poland.
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- Kooijman, Ellen, 1981- (författare)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden,Swedish Museum Nat Hist, Dept Geosci, Stockholm, Sweden.
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- Majka, Jaroslaw (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,AGH Univ Krakow, Fac Geol Geophys & Environm Protect, Al Mickiewicza 30, PL-30059 Krakow, Poland.
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(creator_code:org_t)
- Geological Society of London, 2023
- 2023
- Engelska.
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Ingår i: Journal of the Geological Society. - : Geological Society of London. - 0016-7649 .- 2041-479X. ; 180:6
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The Köli Nappe Complex (KNC) of the Scandinavian Caledonide orogen originated as oceanic terranes within the Iapetus Ocean. These terranes have characteristics of magmatic arcs and associated forearc or back-arc basins and underwent several periods of rifting and magmatism prior to their accretion to the Baltican margin. We present new U–Pb zircon ages from the Lower Köli Ankarede Volcanite Formation in Västerbotten, Sweden. U–Pb ages of magmatic zircon grains from metamorphosed dacitic to andesitic rocks show ages of 512 ± 3.5, 497 ± 2, 491 ± 1 and 488 ± 4 Ma. The three younger ages fit with previous ages for Lower Köli volcanic rocks, but the 512 Ma age is older than any previous age for this unit. These dates constrain the age of magmatism in an ensimatic arc system within Iapetus. We compare this evolution with published information from the other Köli nappes. Magmatic ages within the KNC overlap with ages for an early episode of ultrahigh-pressure (UHP) metamorphism within the underlying Seve Nappe Complex (SNC), supporting the hypothesis that attributes UHP metamorphism within the SNC to subduction beneath the island arc now preserved within the Lower Köli Nappes.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- The changing Earth
- Den föränderliga jorden
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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