Sampling and evaluation of basaltic rocks of the Faroe Islands: Details on material used in geochronological 40Ar/39Ar dating of local rocks

Published: 2 March 2023| Version 1 | DOI: 10.17632/2y29tsw7nh.1
Jogvan Hansen,


The analytical data presented in this ‘Supplement B' are linked to the geochronological study: “On the timing and nature of magmatism in the North Atlantic Igneous Province: New implications from basaltic rocks of the Faroe Islands” by Jógvan Hansen and Morgan Ganerød, 2023. In the actual work new absolute/radiometric ages for onshore sill intrusions and selected lava flows cropping out in the Faroe Islands, by means of the K-Ar based 40Ar/39Ar incremental heating method, have been determined. The actual sills most likely reflect the final stages of magmatism in the Faroe Iceland Basalt Group (FIBG) subsequent to greater magmatic activity, linked to the onset of seafloor-spreading within this part of the NE Atlantic area at ~55.5 to ~56 Ma. In this dataset contribution we provide info regarding collection of suitable rock samples, the nature of their petrography and finally, an overview is presented when it comes to major element compositions of individual samples.


Steps to reproduce

The workflow utilised in this project is as follows: Completely fresh basaltic samples were collected from the targeted rock suites; fine rock powder and thin sections were produced for each of the collected samples; all samples were carefully evaluated by means of thin sections and microscope in order to ensure first class quality; samples were irradiated and then analysed on suitable apparatus; analytical results were carefully evaluated and interpreted using (amongst other means) an 'Age Monster' at Norges Geologiske Undersokelse (NGU), Trondheim, Norway; selected/accepted analytical results were tabulated and associated diagrams produced; electronic supplement published (Mendeley); peer-reviewed paper (main manuscript) published.


Geology, Igneous Petrology, North Atlantic, Geochronology, Faeroe Islands, Large Igneous Province