COSC-2 operational report - Operational data sets

Abstract

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 is being studied in a section provided by two fully cored 2.5 km deep drill holes. These operational data sets concern the second drill site, COSC-2 (boreholes ICDP 5054-2-A and 5054-2-B), drilled from mid April to early August 2020.

COSC-2 is located approximately 20 km eastsoutheast of COSC-1, close to the southern shore of Lake Liten between Järpen and Mörsil in Jämtland, Sweden. COSC-2 drilling started at a tectonostratigraphic level slightly below that at COSC-1’s total depth. It has sampled the Lower Allochthon, the main Caledonian décollement and the underlying basement of the Fennoscandian Shield, including its Neoproterozoic and possibly older sedimentary cover. COSC-2 A reached 2276 m driller's depth with nearly 100 % core recovery between 100 m and total depth. COSC-2 B, with a driller’s depth of 116 m, covers the uppermost part of the section that was not cored in COSC-2 A.

The operational data sets include the drill core documentation from the drilling information system (mDIS), full round core scans, MSCL data sets, a preliminary core description and the geophysical downhole logging data that were acquired during and subsequent to the drilling operations. All downhole logs and core depth were subject to depth correction to a common depth master (cf. operational report for detailed information).

The COSC-2 drill core is archived at the Core Repository for Scientific Drilling at the Federal Institute for Geosciences and Natural Resources (BGR), Wilhelmstr. 25–30, 13593 Berlin (Spandau), Germany.

Authors

• Lorenz, Henning;Uppsala University, Department of Earth Sciences,Villavägen 16, 752 36 Uppsala, Sweden;Uppsala University, Uppsala, Sweden
• Juhlin, Christopher;Uppsala University, Department of Earth Sciences,Villavägen 16, 752 36 Uppsala, Sweden;Uppsala University, Uppsala, Sweden
• Rosberg, Jan-Erik;Lund University, Engineering Geology, John Ericssons väg 1, 221 00 Lund, Sweden;Lund University, Lund, Sweden
• Bazargan, Mohsen;Uppsala University, Department of Earth Sciences,Villavägen 16, 752 36 Uppsala, Sweden
• Klonowska, Iwona;AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, Al. Mickiewicza 30, 30-059 Kraków, Poland;Uppsala University, Uppsala, Sweden
• Kück, Jochem;GFZ German Research Centre for Geosciences, Scientific Drilling, Telegrafenberg, 14473 Potsdam, Germany
• Lescoutre, Rodolphe;Uppsala University, Department of Earth Sciences,Villavägen 16, 752 36 Uppsala, Sweden
• Rejkjær, Simon;Lund University, Engineering Geology, John Ericssons väg 1, 221 00 Lund, Sweden
• Westmeijer, George;Linnæus University, Department of Biology and Environmental Science, Stuvaregatan 4, 39231 Kalmar, Sweden
• Ziemniak, Grzegorz;AGH University of Science and Technology, Faculty of Geology, Geophysics and Environment Protection, Al. Mickiewicza 30, 30-059 Kraków, Poland

Contact

• Lorenz, Henning; Uppsala University, Department of Earth Sciences,Villavägen 16, 752 36 Uppsala, Sweden;
• COSC Science Team; ➦

Contributors

Almquist, Bjarne; Anderson, Mark; Bertilsson, Stefan; Bingen, Bernard; Dopson, Mark; Fossen, Håkon; Kallmeyer, Jens; Lehnert, Oliver; Madonna, Claudio; Menegon, Luca; Pascal, Christophe; Piazolo, Sandra; Roberts, Nick; Tsang, Chin-fu; COSC Consortium; COSC Science Team; COSC Science Team

Keywords

scientific drilling, ICDP, Caledonides, orogeny, mountain building, core drilling, Collisional Orogeny in the Scandinavian Caledonides, COSC, compound material > igneous material, compound material > sedimentary material, industrial process > drilling, science > natural science > earth science, science > natural science > earth science > geology, science > natural science > earth science > geology > hydrogeology, science > natural science > earth science > geology > tectonics, science > natural science > earth science > geophysics, Phanerozoic > Paleozoic, Precambrian > Proterozoic

GCMD Science Keywords

• EARTH SCIENCE > SOLID EARTH > TECTONICS > PLATE TECTONICS > PLATE BOUNDARIES