Figure 4
Petrographic and SEM images of selected alterations. (a) P1-Bwb3, 34–45 cm: brown infilling in a rock fragment (red rectangle). (b) the same infilling analysed with SEM. Note the abundant cracks in the centre of the infilling (white arrow) with smoother boundaries (black arrow) and a large crack next to the contact with the rock (blue arrow). (c) EDS spectrum of the infilling. (d) P2-Bwb1, 20–30 cm: brown infilling with a white rim in a rock fragment. (e) the same infilling analysed with SEM. Red rectangle indicate the selected area for elemental mapping (f) mapping of Fe in the infilling. Blackish areas indicate a lower Fe content, whereas red colours indicate a higher Fe content.
