Summary
In the frame of the GREENPEG project NGU and terratec Geophysical Services have compiled a petrophysical database
of European pegmatite ores and wall rocks from so far four different sites with different types of pegmatites in different
settings.
With the aim to develop toolsets for hidden pegmatite exploration, the GREENPEG project wants to overcome the lack
of exploration technologies for pegmatite ore deposits. Here, a comprehensive petrophysical database contributes with
knowledge on petrophysical contrast between pegmatites and wall rocks facilitating a right choice of geophysical
methodologies and a more efficient exploration.
Petrophysical measurements were therefore performed on hand specimens, drill cores and in selected boreholes at two
of the three project demonstration sites Tysfjord (Norway), Wolfsberg (Austria) and Leinster (Ireland). In addition, hand
specimens from a pegmatite test site in Portugal/Spain were included as well.
The measurements on specimens were carried out at the NGU petrophysical laboratory, acquiring density, susceptibility,
remanence, thermal conductivity and radiometric isotopes content for U, Th and K.
Specimens represent samples from both pegmatites and wall rock to map potential contrasts in the petrophysical
parameters between these two lithologies as a basis for geophysical exploration.
Within the GREENPEG project two wireline downhole geophysical logging campaigns were performed and
measurements done in several boreholes at the demonstration sites Leinster and Wolfsberg. The borehole probes
measured with a sample interval of 1 to 10 cm over the entire depth of the borehole and therefore provide a highresolution
in-situ data set of the rock formation.
The database is uploaded and available on the open data repository Zenodo (www.zenodo.com) under a Creative
Commons Attribution 4.0 International (CC BY 4.0) license. This repository is used by the GREENPEG project to give
access to data collected and acquired by the project.
