Abstract
The Scandinavian Caledonides formed due to the closure of the Iapetus Ocean in Ordovician time, a process that likely involved several subduction-eduction events before the subsequent collision between the palaeocontinents Laurentia and Baltica in Silurian and Early Devonian time. However, there are still uncertainties regarding the evolution and timing of the orogenic processes involved in the formation of the Caledonian orogen. To further investigate the time constraints on the key orogenic events, detailed studies of different high-pressure lithologies and mylonites are required. Such high-pressure lithologies are found in Jamtland, central Sweden, to occur in the Lower and Middle Seve Nappe Complex (SNC). This study focus on the metamorphic evolution of the Helags Mountain area, part of the SNC in Jamtland. Preliminary results show that the rocks of this area record a similar history to that of the key locality of Areskutan Nappe. Studies of the Helags Mountain area can therefore shed further light on the geological history of the Seve Nappe Complex, and can add another piece to the Caledonian puzzle.
Highlights
The Scandinavian Caledonides formed due to the closure of the Iapetus Ocean in Ordovician time, a process that likely involved several subduction-eduction events before the subsequent collision between the palaeocontinents Laurentia and Baltica in Silurian and Early Devonian time (e.g. Gee et al 2008)
There are still uncertainties regarding the evolution and timing of the orogenic processes involved in the formation of the Caledonian orogen
To further investigate the time constraints on the key orogenic events, detailed studies of different high-pressure lithologies and mylonites are required. Such high-pressure lithologies are found in Jämtland, central Sweden, to occur in the Lower and Middle Seve Nappe Complex (SNC)
Summary
The Scandinavian Caledonides formed due to the closure of the Iapetus Ocean in Ordovician time, a process that likely involved several subduction-eduction events before the subsequent collision between the palaeocontinents Laurentia and Baltica in Silurian and Early Devonian time (e.g. Gee et al 2008). To further investigate the time constraints on the key orogenic events, detailed studies of different high-pressure lithologies and mylonites are required. Such high-pressure lithologies are found in Jämtland, central Sweden, to occur in the Lower and Middle Seve Nappe Complex (SNC).
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