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Hydrothermal Au-Bi-Te Deposit

Chemical Process (Liquid-phase Growth) - Open system under ground


Hypothermal Deposit, Low-T Hydrothermal Vein Deposit, Low-T Hydrothermal Ore Deposit

Index Minerals

Gold, Bismuth, Joséite (Joseite)

Required Geological Setting

Accretionary complexes + Plutonic rocks

Associated metasomatic zones



Vein-type deposit formed by 50-100 degree hydrothermal fluid originated from Acidic (I-type Granite) or Neutral (Granodiorite, Diorite) I-type (magnetite-series) magmatic activities. Origin of hydrothermal fluid is magmatic water from magma and/or meteoric water. Meteoric water is circulated by heat of magma. This type of deposits is formed at deep circumstances whereas Hydrothermal Au-Ag deposits are formed at shallow circumstances by the same 50-100 degree hydrothermal fluid. Typical elements concentrated are Au, Bi, and/or Te, and Ag is not concentrated. Host of deposits are basements of plutonic rocks.

Hydrothermal Au-Bi-Te Deposit

Distribution of Low-T Hydrothermal Vein Au-Bi-Te Deposits described in this site. Red is ilmenite-series granite, and blue is magnetite-series granite.

Mineral Assemblages (Ore)

Gold, Sulphur, Bismuth, Joséite (Joseite), Bismuthinite, Pyrite

Mineral Assemblages (Gangue)

Quartz, Calcite

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