The mechanisms and time scale of alteration halos in vein-type …
2017年10月1日 · Alteration halos normal to the veins are narrow and decreases with depth. Depth-dependent porosity forms alteration halos like those at the tungsten deposits. The …
Fracture growth and damage zone evolution in fault-vein systems ...
2024年10月1日 · The alteration halo is in many cases regarded as a proxy for the damage zone and can be interpreted as the result of fracture propagation processes (Engvik et al., 2005). …
Alteration and mineralization patterns in orogenic gold deposits ...
2022年9月30日 · The alteration halo in the Blackwater mesozonal deposit is dominated by the formation of chlorite, replacement of albite by muscovite, and disseminated arsenopyrite and …
Examples of alteration halos. (a) Elliptical shape of an alteration ...
(a) Elliptical shape of an alteration halo around an isolated joint. The joint trace consists of overlapping smaller joint segments. Two veins, one at high-angle and one at low-angle to the …
Tracing Detrital Epidote Derived from Alteration Halos to …
The regional distribution of chalcophile elements in porphyry-related epidote is controlled by the presence of pyrite in the alteration halo of the porphyry deposit (Cooke et al., 2014). The …
Alteration haloes surrounding vein systems. a Quartz along …
Alteration associated with vein formation is restricted to thin halos of silisification in the wall rocks. A supergene argillic alteration has affected the w...
Schematic illustration of alteration zoning and overprinting ...
The alteration halo of the Emmy deposit contains vuggy residual quartz, with Au-Ag-telluride and Au-Ag mineralization plus other tellurium-bearing minerals (goldfieldite, kawazulite, coloradoite...
Alteration in Gold-Only Deposits - SpringerLink
2022年6月17日 · Reaction between rocks and fluid changes the rocks and this produces an alteration zone or halo. The reaction also modifies the fluid with the potential to cause gold …
Primary alteration and geochemical dispersion haloes of …
2001年8月1日 · The primary geochemical dispersion halo may extend laterally for >200 m, and along strike for a few kilometres, from the gold orebody. A single geochemical parameter …
Geology, alteration and lithogeochemistry of the …
2020年2月7日 · At Lalor Lake (Manitoba, Canada), the high-temperature chlorite-dominated stringer zones are located in footwall Mg-Fe alteration halo, whereas massive sulphides are …