U–Pb baddeleyite ages and Hf, Nd isotope chemistry constraining repeated mafic magmatism in the Fennoscandian Shield from 1.6 to 0.9 Ga

Söderlund, Ulf; Isachsen, C. E.; Bylund, Göran; Heaman, Larry M.; Patchett, P. Jonathan; Vervoort, Jeff D.; Andersson, Ulf

doi:10.1007/s00410-005-0011-1

Cited by 197 publications

(107 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The granites are cut by vertical faults, some running tangentially to the periphery of the crater, and are intruded by Mesoproterozoic, c. 1.2 Ga ago, dykes and sills known as Åsby dolerite (Fig. 1;Bergman et al, 2006;Gorbatschev and Gaál, 1987;Lindström and Sturkell, 1992;Söderlund et al, 2005).…”

Section: Geology Of the Lockne Target Areamentioning

confidence: 99%

Relationships among magnetic fabrics, microfractures and shock pressures at an impact crater: A case study from Lockne crater, Sweden

Agarwal

Kontny

Greiling

2015

Journal of Applied Geophysics

View full text Add to dashboard Cite

Section: Geology Of the Lockne Target Areamentioning

confidence: 99%

Relationships among magnetic fabrics, microfractures and shock pressures at an impact crater: A case study from Lockne crater, Sweden

Agarwal

Kontny

Greiling

2015

Journal of Applied Geophysics

View full text Add to dashboard Cite

“…Dolerite dykes with NNW-SSE trend (Fig. 1B) dated to 0.95 Ga (Söderlund et al, 2005), represent the youngest magmatic component.…”

Section: Falun Inliermentioning

confidence: 99%

Time constraints on magmatism, mineralisation and metamorphism at the Falun base metal sulphide deposit, Sweden, using U–Pb geochronology on zircon and monazite

Kampmann

Stephens

Ripa

et al. 2016

Precambrian Research

View full text Add to dashboard Cite

a b s t r a c t 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 207 Pb/ 206 Pb 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 207 Pb/ 206 Pb 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 felsic sub-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 207 Pb/ 206 Pb weighted average ages of 1831 ± 8 Ma and 1822 ± 5 Ma, respectively. These ages fall well within the temporal range of a younger 1.84-1.81 Ga (M 2 ) metamorphic episode during the 2.0-1.8 Ga Svecokarelian orogeny, with the older episode (M 1 ) inside the Bergslagen lithotectonic unit at around 1.86 Ga. This shows the major influence of the M 2 event in the north-western part of this unit, leading to a complete resetting of the U-Th-Pb isotope system in monazite.

show abstract

“…Relicts of Sveconorwegian eclogites, dated at 972 Ma (Johansson et al 2001), occur near Ullared (Möller 1998) in E-W mega-scale folds. The folding event has been dated at 976 ± 7 Ma by Möller et al (2007), who interpreted the extrusion of eclogites to be the response to N-S compression simultaneous with emplacement of diabase dykes (978-935 Ma) in adjacent crustal units (Hellström et al 2004;Söderlund et al 2005). Larson and Berglund (1995) and Lundqvist (1996) Several generations of mafic plutons and dykes occur north and south of Lake Vättern adjacent to and within the PZ.…”

Section: Geological Settingmentioning

confidence: 97%

“…The mafic magmatism comprises sparse gabbroic and anorthositic plutons, but is dominated by dykes and sills. These rocks are often related to intracontinental rift-basins with continental flood basalts intercalated between the sandstone successions, such as in the Lake Ladoga region (Russia) and the Dalarna province of central Sweden (Amantov et al 1996;Nyström 2004;Rämö et al 2005;Söderlund et al 2005).…”

Section: Northern Area--mafic Dyke-dominated Intrusionsmentioning

confidence: 98%

“…Č ečys et al 2002;Robinson et al 2003;Rämö et al 2005;Söderlund et al 2005;Motuza et al 2006), now documented in western Norway, central and southern Sweden, the Lake Ladoga region, Bornholm, Poland and the Baltic states. Only now it is possible to discern distinct compositional and temporal trends of this magmatism and decipher plausible tectonic settings.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mesoproterozoic (1.47–1.44 Ga) orogenic magmatism in Fennoscandia; Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden

Brander¹

2007

Int J Earth Sci (Geol Rundsch)

Self Cite

View full text Add to dashboard Cite

The Jönköping Anorthositic Suite (JAS) in S. Sweden has characteristics typical for (Proterozoic) massiftype anorthosites. The interstitial liquid of these plagioclase-porphyritic rocks solidified at 1,455 ± 6 Ma, as determined by U-Pb isotope analysis of baddeleyite. The JAS developed during a regional 1.47-1.44 event in Fennoscandia that generated widespread mafic magmatism (basalts, and diabase dykes and sills) in the north and emplacement of felsic plutons in the south. The event of 1.47-1.44 Ga magmatism in Fennoscandia largely coincides in age with dynamic high-grade metamorphism in SW Sweden and was probably related to convergent activemargin processes during the Danopolonian orogeny.

show abstract

U–Pb baddeleyite ages and Hf, Nd isotope chemistry constraining repeated mafic magmatism in the Fennoscandian Shield from 1.6 to 0.9 Ga

Cited by 197 publications

References 71 publications

Relationships among magnetic fabrics, microfractures and shock pressures at an impact crater: A case study from Lockne crater, Sweden

Relationships among magnetic fabrics, microfractures and shock pressures at an impact crater: A case study from Lockne crater, Sweden

Time constraints on magmatism, mineralisation and metamorphism at the Falun base metal sulphide deposit, Sweden, using U–Pb geochronology on zircon and monazite

Mesoproterozoic (1.47–1.44 Ga) orogenic magmatism in Fennoscandia; Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden

Contact Info

Product

Resources

About