northwest Metamorphic fluids and gold
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australian electronic gold prospecting forum.com  |  Geology and earth sciences  |  Earth sciences and related topics  |  Hydrothermal Mineral Deposits  |  Topic: Metamorphic fluids and gold 0 Members and 1 Guest are viewing this topic. « previous next »
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Doug
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« on: Sunday March 16 2014 15:50:19 AEDT PM »

Metamorphic fluids and gold
G. NEIL PHILLIPS
Abstract
Low-salinity fluids (T > 200 ~ reduced S, modest CO2) and high geothermal gradients are common to many gold deposits and provinces. In contrast, host rocks, hosting structures, depth of formation (in the crust during deposition), subsequent metamorphic overprint, alteration mineralogy and isotopic signatures can vary dramatically within single deposits or provinces. Gold deposits with co-product base metals are an exception to the above comments, and probably relate to saline fluids.
The low salinity fluids inferred for major gold-only deposits are not easily explained by seawater,basinal brines, meteoric fluid or common magmatic processes. In contrast, metamorphic devolatilisation of mafic/greywacke rocks is one effective way to produce low-salinity metamorphic fluids with characteristics matching the gold fluids. Such an origin also explains the link to geothermal gradients
  
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australian electronic gold prospecting forum.com  |  Geology and earth sciences  |  Earth sciences and related topics  |  Hydrothermal Mineral Deposits  |  Topic: Metamorphic fluids and gold « previous next »
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