Borehole logs from the Precambrian basement on Bornholm, eastern Denmark: geology and groundwater flow

  • Peter Gravesen Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K. Denmark
  • Bertel Nilsson Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K. Denmark
  • Per Rasmussen Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K. Denmark
  • Stig A. Schack Pedersen Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K. Denmark

Abstract

Bornholm is situated in the Sorgenfrei–Tornquist Zone that separates the North-West European Craton from the Baltic Shield and the East European Platform (Fig.1). The Precambrian basement of northern and eastern Bornholm consists of different granitic and gneissic Mesoproterozoic rocks that are dated to c. 1455 Ma (Waight et al. 2012). It appears from the age data that granitic magmatism, deformation and metamorphism occurred over a relatively short time period. The rocks contain abundant pegmatite and aplite bodies. More than 250 mafic dykes occur. The dykes were intruded during three Precambrian events at c. 1326 Ma, 1220 Ma, 950 Ma and during a Permian event at c. 300 Ma (Holm et al. 2010).

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Published
2014-06-25
How to Cite
Gravesen, P., Nilsson, B., Rasmussen, P., & Schack Pedersen, S. A. (2014). Borehole logs from the Precambrian basement on Bornholm, eastern Denmark: geology and groundwater flow. GEUS Bulletin, 31, 15-18. https://doi.org/10.34194/geusb.v31.4637
Section
RESEARCH ARTICLE | SHORT

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