Upper photo: intense fine grain hydrothermal biotite replacement selvages on dark fluorite-pyrrhotite-calcite vein in bottom row and on light calcite-pyrhhotite soviet breccia in top row; 550m in Hole 2. Lower photo: coarse hydrothermal biotite within interstitial sulfide grains in completely replaced sovite dyke, itself cut by late hematite-carbonate-sulfide veins; 576m in Hole 2.
Upper photo: intense fine grain hydrothermal biotite replacement selvages on dark fluorite-pyrrhotite-calcite vein in bottom row and on light calcite-pyrhhotite soviet breccia in top row; 550m in Hole 2. Lower photo: coarse hydrothermal biotite within interstitial sulfide grains in completely replaced sovite dyke, itself cut by late hematite-carbonate-sulfide veins; 576m in Hole 2.