Trace and minor element variations and sulfur isotopes in crystalline and colloform
ZnS: Incorporation mechanisms and implications for their genesis.
The vein at this position is a quartz-calcite-adularia crustiform vein including amethyst and colloform
banding with sulfides.
banded quartz veining has also been observed.
The manganese mineralization occurs mainly as nodules within the sedimentary section, and both Mn and Fe minerals exhibit colloform
31 g/t silver) while more complex silicified hydrothermal breccias with fragments of banded colloform
quartz were encountered in hole NB-12-138 (4.
This mineral assemblage is found in hydrothermal breccia veins and exhibits colloform
textures consistent with low-sulphidation epithermal systems.
Ore textures primarily reflect open-space filling phenomena, which includes spectacular, fine to coarse-grained colloform
bands of hematite as wall coatings and breccia fillings.
Distinctive, light green, colloform
, subcircular, angular and tear drop shaped "fragments" are very common also.
Quartz and limonite breccia contained colloform
, comb and cockade textures.
Magnetite commonly forms euhedral aggregates and is present less commonly with colloform
banding, carbonate replacement textures and delicate crustiform layers of moss adularia are commonly observed.
These bornite ores exhibit bornite and chalcopyrite intergrown in spheroidal and colloform