3D interpretation by integrating seismic and potential field data in the vicinity of the proposed COSC-1 drill site, central Swedish Caledonides
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The scientific drilling project COSC (Collisional Orogeny in the Scandinavian Caledonides), designed to study key questions concerning orogenic processes, aims to drill two fully cored boreholes to depths of c. 2.5 km each at carefully selected locations in west-central Sweden. The first of these, COSC-1, is scheduled for start late spring 2014 and will target the Seve Nappe Complex, characterized by inverted metamorphism and with parts that have evidently been subjected to hot ductile extrusion. In this study available seismic sections have been combined with surface geology to produce a 3D interpretation of the tectonic structures in the vicinity of the COSC-1 borehole. Constrained 3D inverse gravity modelling over the same area supports the interpretation, and the high-density Seve Nappe Complex stands out clearly in the model. Interpretation and models show that the maximum depth extent of the Seve Nappe Complex is less than 2.5 km, consistent with reflection seismic data. The gravity modelling also requires underlying units to comprise low-density material, consistent with the Lower Allochthon, but the modelling is unable to discern the décollement separating the allochthons from the crystalline Precambrian basement.
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Hedin, P.; Malehmir, A.; Gee, D.; Juhlin, Christopher; Dyrelius, D. (2013)Drilling of the first borehole, about 2.5 km deep, for the continental scientific deep drilling project COSC (Collisional Orogeny in the Scandinavian Caledonides) is scheduled to begin in the summer of 2013. Here we present ...
COSC-1 - drilling of a subduction-related allochthon in the Palaeozoic Caledonide orogen of ScandinaviaLorenz, H.; Rosberg, J.; Juhlin, Christopher; Bjelm, L.; Almqvist, B.; Berthet, T.; Conze, R.; Gee, D.; Klonowska, I.; Pascal, C.; Pedersen, K.; Roberts, N.; Tsang, C. (2015)The Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific drilling project focuses on mountain building processes in a major mid-Palaeozoic orogen in western Scandinavia and its comparison with modern ...
Gee, D.; Juhlin, Christopher; Pascal, C.; Robinson, P. (2010)The COSC project is focused on the mid Paleozoic Caledonide Orogen in Scandinavia in order to better understand orogenic processes, both in the past and in today's active mountain belts. It relates to two of ICDP's main ...