Lineament mapping and geological history of the Kangerlussuaq region, southern West Greenland

Authors

  • Knud Erik S. Klint Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K. Denmark
  • Jon Engström Geological Survey of Finland, P.O. Box 96, SF-02151 Espoo, Finland
  • Andrew Parmenter Nuclear Waste Management Organization, 22 St. Clair Avenue East, Sixth Floor, Toronto, M4T 2S3, Canada
  • Timo Ruskeeniemi Geological Survey of Finland, P.O. Box 96, SF-02151 Espoo, Finland
  • Lillemor Claesson Liljedahl Swedish Nuclear Fuel and Waste Management Co, Box 250, SE-101 24, Stockholm, Sweden
  • Anne Lehtinen Posiva Oy Olkiluoto, SF-27160 Eurajoki, Finland

DOI:

https://doi.org/10.34194/geusb.v28.4725

Abstract

How could future ice ages affect deep nuclear waste repositories in crystalline basement rocks? Deep repositories may be affected by a number of glacially induced processes including, but not limited to, (1) fault activation or re-activation and associated seismicity, (2) changing hydraulic and chemical groundwater dynamics and (3) enhanced erosion. Such processes are likely to affect not only man-made barriers in spent fuel repositories such as copper canisters and bentonite clay buffers, but also the rock masses that contain and isolate the repositories. In order to increase our understanding of this problem, an international study (the Greenland Analogue Project) was set up in 2008. The aim of the study was to use crystalline bedrock at the margin of the Inland Ice near Kangerlussuaq airport in West Greenland as an analogue for future nuclear fuel waste repositories affected by glaciation in Fennoscandia and Canada. Accordingly, a wide range of field surveys were conducted for the analogue project (Fig. 1). This paper describes a detailed structural investigation of lineament zones and the establishment of an event succession for fault and fracture zone evolution in central parts of the study area (Figs 1B, 2), as well as an interpretation of the distribution of fracture and fault zones with potentially increased permeability. Three deep holes were drilled in the study area, and instruments were installed in two of them for subsequent down-hole sampling and monitoring of groundwater to a depth of c. 600 m. The cores were used to compare the subsurface fracture patterns with those established on the basis of surface mapping.

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Published

2013-07-10

How to Cite

Klint, K. E. S., Engström, J., Parmenter, A., Ruskeeniemi, T., Claesson Liljedahl, L., & Lehtinen, A. (2013). Lineament mapping and geological history of the Kangerlussuaq region, southern West Greenland. GEUS Bulletin, 28, 57–60. https://doi.org/10.34194/geusb.v28.4725

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Section

RESEARCH ARTICLE | SHORT