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U–Pb zircon age dating of diamond-bearinggneiss from Fjørtoft reveals repeated burialof the Baltoscandian margin during theCaledonian Orogeny
AGH University of Science and Technology, Krakow, Poland.ORCID iD: 0000-0001-8944-1053
University of the West of Scotland, Paisley, Renfrewshire, GB.ORCID iD: 0000-0002-1029-6357
Naturhistoriska riksmuseet.ORCID iD: 0000-0003-2377-8272
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.ORCID iD: 0000-0002-6792-6866
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2019 (English)In: Geological Magazine, ISSN 0016-7568, E-ISSN 1469-5081, Vol. 156, p. 1949-1964Article in journal (Refereed) Published
Abstract [en]

The first find of microdiamond in the Nordøyane ultra-high-pressure (UHP) domain of theWestern Gneiss Region (WGR) of the Scandinavian Caledonides reshaped tectonic modelsfor the region. Nevertheless, in spite of much progress regarding the meaning and significanceof this find, the history of rock that the diamonds were found in is complex and still largelyambiguous. To investigate this, we report U–Pb zircon ages obtained from the exact crushedsample material in which metamorphic diamond was first found. The grains exhibit complicatedinternal zoning with distinct detrital cores overgrown by metamorphic rims. The coresyielded a range of ages from the Archaean to the late Neoproterozoic / early Cambrian. Thisdetrital zircon age spectrum is broadly similar to detrital signatures recorded by metasedimentaryrocks of the Lower and Middle allochthons elsewhere within the orogen. Thus, our datingresults support the previously proposed affinity of the studied gneiss to the Seve–Blåhø Nappeof the Middle Allochthon. Metamorphic rims yielded a well-defined peak at 447 ± 2 Ma and abroad population that ranges between c. 437 and 423 Ma. The data reveal a prolonged metamorphichistory of the Fjørtoft gneiss that is far more complex then would be expected for aUHP rock that has seen a single burial and exhumation cycle. The data are consistent with amodel involving multiple such cycles, which would provide renewed support for the dunktectonics model that has been postulated for the region.

Place, publisher, year, edition, pages
Cambridge: Cambridge University Press, 2019. Vol. 156, p. 1949-1964
National Category
Geology
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URN: urn:nbn:se:uu:diva-401050DOI: 10.1017/S0016756819000268OAI: oai:DiVA.org:uu-401050DiVA, id: diva2:1382740
Available from: 2020-01-04 Created: 2020-01-04 Last updated: 2020-01-04

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Walczak, KatarzynaCuthbert, SimonKooijman, EllenMajka, JaroslawSmit, Matthijs
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