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- Kampmann, TobiasLuleå tekniska universitet,Geovetenskap och miljöteknik,Lulea Univ Technol, Dept Civil Environm & Nat Resources Engn, Div Geosci, SE-97187 Lulea, Sweden. (author)
Time constraints on magmatism, mineralisation and metamorphism at the Falun base metal sulphide deposit, Sweden, using U-Pb geochronology on zircon and monazite
- Article/chapterEnglish2016
Publisher, publication year, extent ...
- Elsevier,2016
- electronicrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:ltu-3483
- https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-3483URI
- https://doi.org/10.1016/j.precamres.2016.03.011DOI
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-297775URI
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- Language:English
- Summary in:English
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Notes
- Validerad; 2016; Nivå 2; 20151014 (tobkam)
- U–Th–Pb (zircon and monazite) ion probe data have provided constraints on the timing of emplacement and metamorphism of magmatic rocks close to the Palaeoproterozoic, Falun base metal sulphide deposit in the Bergslagen lithotectonic unit, Fennoscandian Shield, Sweden, and, thereby the timing of mineralisation. Hydrothermal alteration and mineralisation at Falun are constrained to a short interval of several million years between a 207Pb/206Pb weighted average age of 1894 ± 3 Ma for a rhyolitic sub-volcanic rock in the felsic volcanic to sub-volcanic host rock suite, and a 207Pb/206Pb weighted average age of 1891 ± 3 Ma for a post-sulphide, porphyritic dacite dyke. Magmatism also included the emplacement of granite plutons with igneous crystallization ages of 1894 ± 3, 1894 ± 2 Ma and 1893 ± 3 Ma. The felsicsub-volcanic to volcanic activity and the emplacement of dacite dykes and granite plutons overlap in age within their respective analytical uncertainties, indicating hydrothermal alteration and sulphide mineralisation inside a narrow time span of intense magmatic activity, and burial of the supracrustal rocks.Two distinct patchy and homogeneous metamorphic monazite types in a felsic volcanic rock around and hydrothermally altered rocks at the Falun deposit yield 207Pb/206Pb weighted average ages of 1831 ± 8 Ma and 1822 ± 5 Ma, respectively. These ages fall well within the temporal range of a younger1.84–1.81 Ga (M2) metamorphic episode during the 2.0–1.8 Ga Svecokarelian orogeny, with the older episode (M1) inside the Bergslagen lithotectonic unit at around 1.86 Ga. This shows the major influence of the M2 event in the north-western part of this unit, leading to a complete resetting of the U–Th–Pb isotopesystem in monazite.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Geologi hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geology hsv//eng
- NATURVETENSKAP Geovetenskap och miljövetenskap Multidisciplinär geovetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geosciences, Multidisciplinary hsv//eng
- Falun deposit
- Fennoscandian Shield
- SIMS U–Pb geochronology
- Zircon
- Monazite
- Svecokarelian orogeny
- Ore Geology
- Malmgeologi
Added entries (persons, corporate bodies, meetings, titles ...)
- Stephens, MichaelLuleå tekniska universitet,Geovetenskap och miljöteknik,Sveriges Geologiska Undersökning,Lulea Univ Technol, Dept Civil Environm & Nat Resources Engn, Div Geosci, SE-97187 Lulea, Sweden.;Geol Survey Sweden, Box 670, SE-75128 Uppsala, Sweden.(Swepub:ltu)micste (author)
- Ripa, MagnusSveriges Geologiska Undersökning,Geol Survey Sweden, Box 670, SE-75128 Uppsala, Sweden. (author)
- Hellström, FredrikSveriges Geologiska Undersökning,Geol Survey Sweden, Box 670, SE-75128 Uppsala, Sweden. (author)
- Majka, JaroslawUppsala universitet,Mineralogi, petrologi och tektonik,AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Al Mickiewicza 30, PL-30059 Krakow, Poland.(Swepub:uu)jarma730 (author)
- Luleå tekniska universitetGeovetenskap och miljöteknik (creator_code:org_t)
Related titles
- In:Precambrian Research: Elsevier278, s. 52-680301-92681872-7433
Internet link
- https://doi.org/10.1016/j.precamres.2016.03.011Fulltext
- https://ltu.diva-portal.org/smash/get/diva2:976341/FULLTEXT01.pdffulltext:print
- http://ltu.diva-portal.org/smash/get/diva2:976341/FULLTEXT01
- https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-3483
- https://doi.org/10.1016/j.precamres.2016.03.011
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-297775
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