COSC-1 – drilling of a subduction-related allochthon in the Palaeozoic Caledonide orogen of Scandinavia

Lorenz, H.; Rosberg, J.-E.; Juhlin, C.; Bjelm, L.; Almqvist, B. S. G.; Berthet, T.; Conze, R.; Gee, D. G.; Klonowska, I.; Pascal, C.; Pedersen, K.; Roberts, N. M. W.; Tsang, C.-F.

doi:10.5194/sd-19-1-2015

Articles | Volume 19

https://doi.org/10.5194/sd-19-1-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/sd-19-1-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 19

Science report

|

29 May 2015

Science report |

| 29 May 2015

COSC-1 – drilling of a subduction-related allochthon in the Palaeozoic Caledonide orogen of Scandinavia

H. Lorenz, J.-E. Rosberg, C. Juhlin, L. Bjelm, B. S. G. Almqvist, T. Berthet, R. Conze, D. G. Gee, I. Klonowska, C. Pascal, K. Pedersen, N. M. W. Roberts, and C.-F. Tsang

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Jan 2026	56	60	6	122
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Latest update: 05 Feb 2026

Short summary

The Collisional Orogeny in the Scandinavian Caledonides (COSC) scientific drilling project successfully drilled a 2.5km fully cored borehole (COSC-1) through allochthonous subduction-related high-grade metamorphic gneisses and into the underlying thrust zone. This paper summarizes the scientific rationale of the project and presents first preliminary results.