10.1594/GFZ.SDDB.ICDP.5054.2015 Lorenz, Henning Uppsala University, Department of Earth Sciences, Geophysics Rosberg, Jan-Erik Lund University, Engineering Geology Juhlin, Christopher Uppsala University, Department of Earth Sciences, Geophysics Bjelm, Leif Lund University, Engineering Geology Almqvist, Bjarne Bjarne Almquist 0000-0002-9385-7614 Uppsala University, Department of Earth Sciences, Geophysics Berthet, Théo Uppsala University, Department of Earth Sciences, Geophysics Conze, Ronald 0000-0002-8209-6290 GFZ German Research Centre for Geosciences, Scientific Drilling ICDP Gee, David G. Uppsala University, Department of Earth Sciences, Geophysics Klonowska, Iwona Uppsala University, Department of Earth Sciences, Geophysics Pascal, Christophe University of Bochum, Institute of Geology, Mineralogy and Geophysics Pedersen, Karsten Chalmers University of Technology, Division of GeoEngineering Roberts, Nick British Geological Survey Tsang, Chinfu Lawrence Berkeley National Laboratory, Earth Sciences Division GFZ Data Services 2015 caledonides COSC deep hydrosphere dynamics europe heat flow himalaya ICDP-2011/03 microbiology norway orogen scandes scandinavia seismic sweden earth science EARTH SCIENCE > SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS > METAMORPHIC ROCK FORMATION Lorenz, Henning Uppsala University, Department of Earth Sciences, Geophysics Rosberg, Jan-Erik Lund University, Engineering Geology Juhlin, Christopher Uppsala University, Department of Earth Sciences, Geophysics Bjelm, Leif Lund University, Engineering Geology Almqvist, Bjarne Bjarne Almquist 0000-0002-9385-7614 Uppsala University, Department of Earth Sciences, Geophysics Berthet, Théo Uppsala University, Department of Earth Sciences, Geophysics Conze, Ronald 0000-0002-8209-6290 GFZ German Research Centre for Geosciences, Scientific Drilling ICDP Gee, David G. Uppsala University, Department of Earth Sciences, Geophysics Klonowska, Iwona Uppsala University, Department of Earth Sciences, Geophysics Pascal, Christophe University of Bochum, Institute of Geology, Mineralogy and Geophysics Pedersen, Karsten Chalmers University of Technology, Division of GeoEngineering Roberts, Nick British Geological Survey Tsang, Chinfu Lawrence Berkeley National Laboratory, Earth Sciences Division Lorenz, Henning Uppsala University, Department of Earth Sciences, Geophysics COSC Consortium /2017-03-01 2015-03-10 2013-09-05/2014-10-11 Dataset 10.5194/sd-19-1-2015 10273/ICDP5054EHW1001 10273/ICDP5054EHX1001 10273/ICDP5054EH02001 10.2312/ICDP.2015.001 10.2312/ICDP.2015.002 10.5880/ICDP.5054.001 10.5334/dsj-2017-002 10.5880/ICDP.5054.002 CC BY 4.0 The Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific drilling project focuses on mountain building processes in a major mid-Paleozoic orogen in western Scandinavia and its comparison with modern analogues. The transport and emplacement of subduction-related highgrade continent-ocean transition (COT) complexes onto the Baltoscandian platform and their influence on the underlying allochthons and basement will be studied in a section provided by two fully cored 2.5 km deep drill holes. This operational report concerns the first drill hole, COSC-1 (ICDP 5054-1-A), drilled from early May to late August 2014.
COSC-1 is located in the vicinity of the abandoned Fröå mine, close to the town of Åre in Jämtland, Sweden and was planned to sample a thick section of the Seve Nappe and to penetrate its basal thrust zone into the underlying lower grade metamorphosed allochthon. Despite substantial technical problems, the drill hole reached 2495.8 m driller's depth and nearly 100 % core recovery was achieved. Surprising was the homogeneity of the Seve Nappe rocks, the unexpected thickness of its basal thrust zone (> 500 m) and that the drill hole, therefore, did not penetrate the bottom of the thrust zone. However, lower grade metasedimentary rocks were encountered in the lowermost part of the drill hole together with tens of metres thick mylonites that are, unexpectedly, rich in large garnets.
The drill core was documented on-site and XRF scanned off site. During various stages of the drilling, the borehole was documented by comprehensive downhole logging. This operational report provides an overview over the COSC-1 operations from drilling preparations to the sampling party and describes the available datasets and sample material.
Åre, Jämtlands län, Sweden 13.2031 63.4063