Gold in relation to hydrothermal solution

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Ch. 6 - Sedimentary & Metamorphic Rocks

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Presentation transcript:

Gold in relation to hydrothermal solution

The Gold Deposits Gold ore from the Olinghouse epithermal deposit, Nevada.

Au-Cu-Zn(Pb) relationship in space

Carlin type gold deposit

The invisible gold—Carlin type Au deposits Carlin-type deposits are characterized by relatively high Au/Ag, enrichment in As, Sb, Hg, and Tl, and by the dominance of "invisible gold" as ions or submicron-sized particles in iron sulfide. The deposits are generally but not always hosted by Paleozoic carbonate rocks, and it has been proposed that they are largely controlled by deep-seated, ancient structures. Recent research indicates formation from relatively low temperature (150-250(C), low pH, and low- to moderately-saline fluids of mixed meteoric and magmatic or metamorphic origin. The age of ore deposition has been a matter of some speculation, but new data constrains most Carlin-type mineralization in north-central Nevada, site of more than 98% of Carlin-type ore, to the late Eocene, suggesting a genetic relationship with coeval regional magmatism. This has provided ammunition for the magmatist crowd; however, some researchers continue to advocate an amagmatic origin.

Archean rocks

Gold in Canada

Gold in greenstone belt – the case of Australia

The case In China

Gold in conglomerate – The Wits

Gold in River Sand

Cu-Ni- (PGE) sulfide