Abstract
The Skuggliberga unit of the Oppdal area, central Scandinavian Caledonides: calc-alkaline pyroclastic volcanism in a fluvial to shallow-marine basin following a mid-Ordovician orogenic event
Highlights
The Scandinavian Caledonides preserve remnants of the ancient Iapetus Ocean, which opened in the Late Neoproterozoic and closed during the convergence and final collision of Laurentia, Baltica and Avalonia in the Palaeozoic (e.g., Wilson, 1966; Gee et al, 2008; Corfu et al, 2014; Domeier, 2016)
Geochemical data and detrital zircon U–Pb ages from the newly defined Skuggliberga unit of the Oppdal area, central Norwegian Caledonides
We review the geology of the Trondheim Nappe Complex (TNC) in the Oppdal area, and add new field observations, geochemical data, U–Pb detrital zircon and Ar–Ar data from the sandstones and volcanic rocks above the regional unconformity
Summary
The Scandinavian Caledonides preserve remnants of the ancient Iapetus Ocean, which opened in the Late Neoproterozoic and closed during the convergence and final collision of Laurentia, Baltica and Avalonia in the Palaeozoic (e.g., Wilson, 1966; Gee et al, 2008; Corfu et al, 2014; Domeier, 2016). Remnants of this ocean can be found all along the Scandinavian Caledonides and are abundant in the Trondheim and Köli nappe complexes (Fig. 1A). Whereas most of the c. 500–480 Ma SSZ ophiolite fragments, including Lyngen, Leka, Løkken–Vassfjellet–Bymarka (LVB), Gullfjellet and Karmøy (Fig. 1A; e.g., Pedersen et al, 1992; Pedersen & Dunning, 1997; Slagstad et al, 2014) have been investigated in detail, many aspects of the stratigraphy, depositional environment, tectonic setting and absolute ages of the overlying Ordovician to Silurian cover successions remain unresolved.
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