The Helags Mountain, Sweden: Another piece in the Caledonian puzzle
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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 Jämtland, 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 Jämtland. Preliminary results show that the rocks of this area record a similar history to that of the key locality of Åreskutan 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.
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References
Florence, F. P. & Spear, F. S., 1991. Effects of diffusional modification of garnet growth zoning on PT path calculations. Contributions to Mineralogy and Petrology, 107, 4, 487-500.
Gee, D.G., Fossen, H., Henriksen, N., Higgins, A.K., 2008. From the Early Paleozoic Platforms of Baltica and Laurentia to the Caledonide Orogen of Scandinavia and Greenland. Episodes 31, 44-51.
Janák, M., van Roermund, H., Majka, J., Gee, D., 2013: UHP metamorphism recorded by kyanite-bearing eclogite in the Seve Nappe Complex of northern Jämtland, Swedish Caledonides. Gondwana Research 23, 865-879.
Klonowska, I., Majka, J., Janák, M., Gee, D.G., Ladenberger A., 2014: Pressuretemperature evolution of a leucogranulite from Åreskutan: implications for (U)HP metamorphism of the Seve Nappe Complex, west-central Jämtland, Swedish Caledonides. Geological Society (London) – Special Publication, 390, 321-336.
Majka, J., Be’eri-Shlevin, Y., Gee, D. G., Ladenberger, A., Claesson, S., Konecny, P., Klonowska, I., 2012. Multiple monazite growth in the Åreskutan migmatite: evidence for a polymetamorphic Late Ordovician to Late Silurian evolution in the Seve Nappe Complex of west-central Jamtland, Sweden. Journal of Geosciences, 57, 1, 3-23.
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