Expanding Norway’s potential

Inversion of airborne gravity gradient data has enhanced interpretation of Norway’s Karasjok Greenstone Belt.

In the early 1980s, the Geological Survey of Norway (NGU) conducted an exploration program in the northern county of Finnmark, a highly prospective greenfield area which encompasses the Karasjok Greenstone Belt. It was the first aeromagnetic and gravity survey of the area and served to establish a preliminary description of its lithology, stratigraphy and mineralizations.

New inversion methods are now helping to enhance earth models and interpretation of Norway’s Karasjok Greenstone Belt. The project serves as a case example for the use of geological and geophysical techniques both for mineral exploration and geology in 3D.

Article highlights:

  •  Efforts to improve data coverage in the Karasjok Greenstone Belt, as part of the Mapping of Mineral Resources in Northern Norway (MINN) program.
  • The application of new inversion methods, in Geosoft VOXI Earth Modelling, including improvements in the prismatic approximation of surfaces and Iterative Reweighting Inversion (IRI) methods for reverse-modelling of gravity gradient data.
  • How the inversion has helped to outline the Karasjok Greenstone Belt, and next steps in the interpretation process.  

Read the Mining Journal article.

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