Compilation of data acquired by optical microscopy and automated quantitative mineralogy combined with scanning electron microscopy (AQM-SEM) of thinsections from the Qullissat bore hole FP94-4-5 and correlation to petrophysical measurements

Focus of this project is the identification, quantification, and characterisation of mineral phases present in samples of the borehole FP94-4-5 located a few kilometers south of the abandoned village Qullissat at northern Disko Island (UTM22N coordinates: 7772427N, 423818E), West Greenland Basalt Province. The exploration bore hole FP94-4-5 targeted a highly conductive anomaly that was identified by an airborne EM-survey (Olshefsky & Jerome, 1993). The vertical borehole had a total depth of 270.5 m and intersected the complete fine-crystalline volcanic succession (depths: 58.1–190.5 m) but also intercepted sedimentary rocks stratigraphically above and below that targeted volcanic succession. The borehole was part of a diamond drilling project that was initiated by the mineral exploration company Falconbridge Greenland A/S in March 1994 to investigate a Palaeocene (62-61 Ma) sediment-contaminated volcanic succession of the Asuk Member, Vaigat Formation, for Ni-Cu-PGE mineralization (Olshefsky et al., 1995, Pedersen et al., 2017,2018). The contamination of the Asuk Member magma by carbonaceous sediments (marine mudstones, deltaic shales and coal seams) resulted in strongly reduced conditions enabling the formation of native iron, as well as graphite, Ni-Fe-phosphides and Ni-Cu-sulphides (Pedersen et al., 2017,2018; Stensgaard et al., 2018).