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Early Neoproterozoi...
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Callegari, RiccardoUppsala universitet,Mineralogi, petrologi och tektonik,Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Kraków, Poland
(author)
Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides
- Article/chapterEnglish2023
Publisher, publication year, extent ...
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Geological Society of London,2023
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:nrm-5505
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https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-5505URI
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https://doi.org/10.1144/jgs2022-092DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-509769URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Petrology, geochronology and bulk-rock chemistry are combined to investigate the early Neoproterozoic magmatismand Cambrian–Ordovician metamorphism in the northern Swedish Caledonides. This work includes several lithologies of theMårma terrane in the Seve Nappe Complex exposed in the Kebnekaise region. U–Pb zircon geochronology yielded crystallizationages of 835 ± 8 Ma for a mylonitic orthogneiss, 864 ± 3 Ma for the Vistas Granite and 840 ± 7 Ma for an intruded granitic dyke,whereas a gabbro and a granodiorite intrusion gave U–Pb zircon crystallization ages of 856 ± 3 Ma and 850 ± 1 Ma, respectively.U–Pb monazite dating of the mylonitic orthogneiss gave an upper intercept age of 841 ± 7 Ma and a lower intercept age of443 ± 20 Ma. Pressure–temperature estimates derived for the mylonitic orthogneiss reveal metamorphic peak-pressure and peaktemperatureof 10.5–11.75 kbar and 550–610°C and 7.4–8.1 kbar at 615–675°C, respectively.Metamorphic pressure–temperatureestimates for the Vistas Granite yield 6.5–7.5 kbar at 600–625°C. Whole-rock chemistry coupled with U–Pb geochronologyindicates that bimodal magmatism was related to attempted rifting of Rodinia between 870 and 840 Ma.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Barker, Abigail K.Uppsala universitet,Mineralogi, petrologi och tektonik(Swepub:uu)abiba516
(author)
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Barnes, Christopher J.Institute of Geological Sciences, Polish Academy of Sciences, Kraków, Poland
(author)
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Klonowska, IwonaUppsala universitet,Mineralogi, petrologi och tektonik,Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Kraków, Poland(Swepub:uu)iwokl585
(author)
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Barker, Abigail K.Department of Earth Sciences, Uppsala University, Uppsala, Sweden
(author)
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Rousku, SabineUppsala universitet,Institutionen för geovetenskaper(Swepub:uu)sabro980
(author)
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Nääs, ErikaUppsala universitet,Institutionen för geovetenskaper
(author)
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Kooijman, Ellen,1981-Naturhistoriska riksmuseet,Enheten för geovetenskap,Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden(Swepub:nrm)ellekooi
(author)
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Witt-Nilsson, PatrikRosmarus Enviro, Uppsala, Sweden
(author)
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Majka, JaroslawUppsala universitet,Mineralogi, petrologi och tektonik,Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Kraków, Poland(Swepub:uu)jarma730
(author)
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Uppsala universitetMineralogi, petrologi och tektonik
(creator_code:org_t)
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In:Journal of the Geological Society: Geological Society of London180:50016-76492041-479X
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Nääs, Erika
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