(1988) Epithermal gold-silver mineralization, wall-rock alteration
, and geochemical evolution of hydrothermal fluids in the ash-flow tuff at Round Mountain, Nevada..
Dill, H.: 1983, Plutonic mobilization, sodium metasomatism, propylitic wall-rock alteration
and element partitioning from Hohensteinweg occurrence (Northeast Bavaria, F.R.G.), 1, 139-166.
The nature, extent, and intensity of wall-rock alteration
and the extent of widespread stockwork or disseminated type mineralization in the altered wall rocks at these Ace properties is not known and may be critical.
It also occurs as a minor component of wall-rock alteration of mafic rocks, and replacing biotite in the outer zone of alteration associated with vein deposits (Lindgren and Ransome, 1906; Thompson et al., 1985; Thompson, 1992).
Roscoelite occurs mostly as a product of wall-rock alteration, replacing plagioclase and biotite in the inner alteration zone of veins (e.g.
Serpentine is a product of wall-rock alteration replacing olivine in mafic rocks of the district (e.g.
Most deposits exhibit minimal wall-rock alteration
. Some of the best known examples occur in the Meguma terrain of Nova Scotia, in the Bendigo and Ballarat districts of Australia, and in the Otago region of New Zealand.