According to previous works (Zheng et al., 2015) and our field observations, the wall rock alteration minerals in the Gaosongshan gold deposit comprise quartz, adularia
, chlorite, sericite, illite, fluorite, calcite and lesser amounts of pyrite.
The replacement of the original magmatic K-feldspar by authigenic K-feldspar (adularia
) was described from the Vendee uranium deposit in the Armorican Massif (France) by Poty et al.
The mineralisation is hosted in quartz lodes carrying quartz, carbonate and adularia
, and late-stage breccia channels carrying bonanza gold grades.
Hydrothermal eruption breccias, sinter overlying zeolytic tuffs and hydrothermal adularia
in permeable fault zones are indicators of hydrothermal activity that may have formed zeolites, as suggested by Brathwaite (2006).
But in both regions the fluorite crystals have formed in clefts in granite which is either purely igneous or to some degree metamorphosed, and in both regions the associated species are colorless to smoky quartz, adularia
, albite, white calcite in tabular to papery--"paper spar"--crystals, and minor apatite-(CaF), hematite and zeolites.
Both the CCW and the CCE zones contain hydrothermal breccias and multiphase stockwork veins with fine grained sulphides (pyrite, acanthite and sulfosalts), within andesitic volcanics that have been pervasively altered with silica and adularia
, the main alteration assemblage.