The Sveconorwegian orogeny – Reamalgamation of the fragmented southwestern margin of Fennoscandia

Slagstad, Trond; Marker, Mogens; Roberts, Nick M.W.; Saalmann, Kerstin; Kirkland, Christopher L.; Kulakov, E.; Ganerød, Morgan; Røhr, Torkil S.; Møkkelgjerd, Steinar Halvdan Hansen; Granseth, Anette; Sørensen, Bjørn Eske

doi:10.1016/j.precamres.2020.105877

Cited by 30 publications

(6 citation statements)

References 121 publications

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“…More recent work on the Sveconorwegian Orogen has, however, shown that this orogeny was characterized by a lack of crustal thickening and near‐continuous heating by mantle‐derived magma, refertilizing the crust on time scales of 150–250 Myr (Bingen et al, 2021; Slagstad et al, 2018). These tectonic features are very different from the Grenvillian Orogeny, characterized by crustal thickening and radiogenic self‐heating (Jamieson et al, 2007; Rivers, 2015), and inconsistent with late Mesoproterozoic continent‐continent collision at the SW Baltican margin (Slagstad et al, 2020). The Neoproterozoic evolution of western Baltica is poorly constrained but was dominated by widespread deposition of clastic sediments and intermittent, rift‐related magmatism (Siedlecka et al, 2004; Nystuen et al, 2008; see also Figure 1).…”

Section: What Is the Evidence For Baltica–laurentia Proximity During ...mentioning

confidence: 97%

“…Palaeogeographic reconstructions and interpreted tectonic setting along the western Baltican margin at different, critical time periods. (a) the period between 1,250 and 920 Ma was dominated by the Sveconorwegian Orogeny, which in recent studies have been interpreted to represent an active margin geographically separated from Laurentia (Kulakov et al, 2022; Slagstad et al, 2019, 2020) (b) palaeomagnetic and geologic data are sparse between 850 and 700 Ma, and neither support nor reject contiguity of Baltica and Laurentia. (c) between 700 and 500 Ma, that is, leading up to the Caledonian Orogeny, palaeomagnetic data are inconclusive with respect to separation of Baltica and Laurentia, however, if separation of Baltica and Laurentia during Sveconorwegian–Grenvillian orogeny is accepted, a hitherto unknown, Neoproterozoic collision must have brought them together prior to separation at 600 Ma.…”

Section: The Western Baltican Margin In the Neoproterozoicmentioning

confidence: 99%

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Was Baltica part of Rodinia?

et al. 2023

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Late Ediacaran opening of the Iapetus Ocean is typically considered to reflect separation of Baltica and Laurentia during final breakup of the Rodinia supercontinent, with subsequent closure during the Caledonian Orogeny. However, evidence of the pre‐opening juxtaposition of Baltica and Laurentia is limited to purportedly similar apparent polar wander paths and correlation of Rodinia‐forming orogenic events. We show that a range of existing data do not unequivocally support correlation of these orogens, and that geologic and palaeomagnetic data instead favour separation of Baltica and Laurentia as early as 1.1–1.2 Ga. Furthermore, new detrital zircon U–Pb age and Ar–Ar thermochronological data from Norway point towards an active western Baltican margin throughout most of the Neoproterozoic and early Palaeozoic. These findings are inconsistent with the majority of palaeogeographic reconstructions that place Baltica near the core of the Rodinia supercontinent.

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Section: What Is the Evidence For Baltica–laurentia Proximity During ...mentioning

confidence: 97%

Section: The Western Baltican Margin In the Neoproterozoicmentioning

confidence: 99%

Was Baltica part of Rodinia?

et al. 2023

Self Cite

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“…1). The orogen formed between 1160 and 920 Ma (Bingen et al, 2008a(Bingen et al, , 2008b(Bingen et al, ,2021Falkum, 1985;Gower et al, 1990;Li et al, 2008;Möller and Andersson, 2018;Slagstad et al, 2017Slagstad et al, , 2020Stephens and Wahlgren, 2020). It includes five lithotectonic units: The Eastern Segment and the Idefjorden, Kongsberg, Bamble, and Telemark lithotectonic units (Fig.…”

Section: Evolution Of the Sveconorwegian Orogenmentioning

confidence: 99%

“…1; nomenclature according to the Geological Survey of Norway; Torgersen et al, 2021). The units were affected differently by the Sveconorwegian orogeny (Bingen et al, 2021;Slagstad et al, 2020) but all contain large (>1000 m 3 ) pegmatites. The main Fig.…”

Section: Evolution Of the Sveconorwegian Orogenmentioning

confidence: 99%

Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation

Rosing-Schow

Romer

Müller

et al. 2023

Precambrian Research

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“…The detailed regional geology of the area has been summarized in a number of recent studies (Bingen et al, 2020; Blereau et al, 2017; Coint et al, 2015; Drüppel et al, 2013; Laurent et al, 2016; Laurent, Duchene, et al, 2018; Roberts & Slagstad, 2015; Slagstad et al, 2013, 2017, 2018, 2020; Spencer et al, 2014). In this paper, we concentrate on the RIC and its country rocks.…”

Section: Regional Geologymentioning

confidence: 99%

Probing the history of ultra‐high temperature metamorphism through rare earth element diffusion in zircon

Blereau

Clark

Kinny

et al. 2021

Journal Metamorphic Geology

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The extent to which solid‐state volume diffusion modifies rare earth element (REE) abundances in accessory minerals during high‐temperature metamorphism governs our ability to link recorded trace‐element compositions to particular thermal events. We model diffusion of REE in zircon under different temperature–time conditions and show that, for both short‐lived (e.g. 1100°C for 1–5 Ma) and more prolonged (e.g. 1050°C for 10–30 Ma or 1000°C for 200 Ma) episodes of ultra‐high‐temperature (UHT) metamorphism, REE diffusion in igneous zircon is sufficiently rapid for REE in a ~50‐μm grain to equilibrate with the new metamorphic mineral assemblage of the host rock. By contrast, unless diffusion is accelerated by recrystallization, the presence of fluids or other processes at temperatures below 900°C zircon will largely retain its original pre‐metamorphic REE abundance pattern, even when the thermal event is long lived (≥100 Ma). Where volume diffusion is dominant, for instance, in the absence of a fluid phase, the sensitivity of REE mobility to temperature can help constrain the temperature–time path of high‐grade metamorphic rocks. Modelling of well‐characterized natural samples from the regional‐scale aureole surrounding the Rogaland Igneous Complex (RIC) in SW Norway shows that variations in REE concentration patterns in zircon indicate a T–t evolution that is consistent with independent P–T–t estimates for regional metamorphism based on phase equilibrium modelling (850–950°C at 7–8 kbar for ~100 Ma). Greater modification of REE abundance patterns in zircons within 2 km of the RIC contact, however, indicates that UHT conditions persisted for ~150 Ma close to the intrusion, with a temperature of ~1100°C for 1–5 Ma at the RIC contact. Thermal modelling suggests that the inferred T–t histories of samples from different distances from the RIC contact are best explained if the complex was emplaced incrementally over 1–5 Ma.

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The Sveconorwegian orogeny – Reamalgamation of the fragmented southwestern margin of Fennoscandia

Cited by 30 publications

References 121 publications

Was Baltica part of Rodinia?

Was Baltica part of Rodinia?

Geochronological constraints for a two-stage history of the Sveconorwegian rare-element pegmatite province formation

Probing the history of ultra‐high temperature metamorphism through rare earth element diffusion in zircon

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