Precambrian orogens and their hypozonal orogenic gold ores

J. Kolb, A. Dziggel, L. Bagas

Publikation: Bidrag til tidsskriftAbstract i tidsskrift

Resumé

High-temperature (hypozonal) orogenic gold deposits formed at conditions of 500 − 700ºC and 2-7 kbar in syn- to post-peak metamorphic shear zones, and appear to be restricted to the Precambrian. Their formation occurred between ca. 3030 Ma (New Consort, South Africa) and ca. 550 Ma (Navachab, Namibia), at an apparent geothermal gradient of 40−80◦C/km, which is similar to mesozonal orogenic gold deposits. The PT conditions of orogenic gold formation define a linear trend resembling terrane exhumation, largely below the granite wet solidus and in the 1-phase stability field for aqueous-carbonic ore fluid compositions (Kolb et al., 2015).
OriginalsprogEngelsk
Sider (fra-til)124
Antal sider1
TidsskriftBulletin of the Geological Society of Finland
Vol/bindSpecial Volume
StatusUdgivet - 2016
Begivenhed32nd Nordic Geological Winter Meeting - Helsinki, Finland
Varighed: 13 jan. 201615 jan. 2016
Konferencens nummer: 32

Programområde

  • Programområde 4: Mineralske råstoffer

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