What is high sulphidation?

What is high sulphidation?

A high metal to sulphur ratio within the sulphide minerals (the sulphidation state). Characterised by. minerals such as enargite and luzonite. Alteration indicative of strongly acidic conditions.

What is vuggy silica?

Vuggy silica developed below the water table as rising magmatic vapors condensed and generated acidic fluids that leached feldspar and mafic minerals out of the rock leaving only a dense residual quartz matrix surrounding empty phenocryst sites.

What is low sulfidation?

What is a Low Sulphidation Epithermal Deposit ? Low sulphidation epithermal deposits represent the uppermost (or most distal) parts of intrusion-related hydrothermal systems. They generally form within 500 metres of surface but may occasionally form between 1-2 kilometres deep.

What is sulfidation state?

Sulfidation states of arc magmas are very low to low, lying between fayalite + magnetite + quartz + pyrrhotite and pyrrhotite + pyrite. A plot of RH values versus measured temperatures for volcanic fumaroles reveals close agreement with the isomolar SO2 = H2S curve (sulfur-gas buffer) to temperatures below 500°C.

Where are epithermal deposits located?

These mineral deposits commonly occur in island, volcanic and continental arcs associated with subduction. However, they can also be found in shallow marine environments and in association with hot springs.

Where is alunite found?

It is currently mined at Tolfa, Italy. In the United States it is found in the San Juan district of Colorado; Goldfield, Nevada; the ghost town of Alunite, Utah near Marysvale; and Red Mountain near Patagonia, Arizona….

What does Vuggy mean?

1. adj. [Geology] Containing vugs, which are cavities, voids or large pores in a rock that are commonly lined with mineral precipitates. See: mineral, pore, vugular porosity.

What is sulfidation process?

Sulfidation (British spelling also sulphidation) is a process of installing sulfide ions in a material or molecule. The process is widely used to convert oxides to sulfides but is also related to corrosion and surface modification.

What is sulfidation corrosion?

Sulfidation Corrosion (also known as sulfidic corrosion) is a result of naturally occurring sulfur compounds found in crude oil. In the absence of hydrogen, corrosion due to sulfur compounds in the crude is thought to occur at temperatures above 500°F (260 °C).

What does epithermal mean?

1 : deposited from warm waters at rather shallow depth under conditions in the lower ranges of temperature and pressure —used of mineral veins and ore deposits — compare hypothermal, mesothermal.

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