Conference Proceedings
1987 AusIMM New Zealand Branch Annual Conference
Conference Proceedings
1987 AusIMM New Zealand Branch Annual Conference
Boiling Fluids in the Otago Schist - Potential for Epithermal Mineralisation?
Some Otago quartz veins display spectacular open-space filling textures indicative of shallow formation. Fluid inclusions in some such veins show that fluid immiscibility occured before or during mineral deposition. This immiscibility or 'boiling' occured at depths ranging from about 3 km to within as little as about 100 metres of the paleo-surface. Temperatures of mineralization range from 190 - 250C. Metals deposited in these veins include: Au(+Ag), Hg, Sb and As. Hydrothermal alteration is confined to minor silicifation of immediate wall-rock schist, less than about two metres from the veins._x000D_
These veins have some similarities to classical epithermal systems elsewhere in the world, although wall-rock alteration is much less developed in Otago._x000D_
From analogy to these classical epithermal systems, it is speculated that gold mineralisation may be found beneath Otago stibnite and cinnabar localities.
These veins have some similarities to classical epithermal systems elsewhere in the world, although wall-rock alteration is much less developed in Otago._x000D_
From analogy to these classical epithermal systems, it is speculated that gold mineralisation may be found beneath Otago stibnite and cinnabar localities.
Contributor(s):
D Craw
-
Boiling Fluids in the Otago Schist - Potential for Epithermal Mineralisation?PDFThis product is exclusive to Digital library subscription
-
Boiling Fluids in the Otago Schist - Potential for Epithermal Mineralisation?PDFNormal price $22.00Member price from $0.00
Fees above are GST inclusive
PD Hours
Approved activity
- Published: 1987
- PDF Size: 0.615 Mb.
- Unique ID: P198712005