Metallogeny of gold deposits
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6196911
The metallogeny of various gold deposits, particularly their broad temporal and spatial relations, and their relations to other metallic ores, is significant to genetic understanding and also useful in exploration. Archean gold deposits co-exist, both regionally and locally, with certain iron formations, massive base metal and nickel sulfide ores, but these occur generally in differing parts of the host stratigraphic sequences. Gold deposits in marine-eugeosynclinal environments are most important and numerous in Archean rocks. They become increasingly rare in successively younger strata where epithermal deposits in subaerial-continental rocks become important. The hydrothermal systems that formed both were apparently similar; one active in submarine tectonic settings, the other in sub-volcanic continental ones. Gold was apparently first introduced extensively into supracrustal rocks by sub-sea floor hydrothermal processes in Archean time, forming gold-enriched exhalites. These were reworked by metamorphic processes forming epithermal veins in many lode districts, and by sedimentary processes in the Witwatersrand. Epithermal gold deposits were generated where these older, auriferous basement source rocks were affected by younger, plutonic-volcanic-hydrothermal activity.
- Research Organization:
- Colorado School of Mines, Golden (USA)
- OSTI ID:
- 6196911
- Report Number(s):
- CONF-8510489-
- Conference Information:
- Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ENERGY SYSTEMS
EXPLORATION
GEOLOGIC AGES
GEOLOGY
GEOTHERMAL SYSTEMS
GOLD ORES
HYDROTHERMAL ALTERATION
HYDROTHERMAL SYNTHESIS
HYDROTHERMAL SYSTEMS
MINERALIZATION
MINERALOGY
ORES
ORIGIN
PETROGENESIS
PETROLOGY
PLATE TECTONICS
PRECAMBRIAN ERA
STRATIGRAPHY
SYNTHESIS
TECTONICS
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ENERGY SYSTEMS
EXPLORATION
GEOLOGIC AGES
GEOLOGY
GEOTHERMAL SYSTEMS
GOLD ORES
HYDROTHERMAL ALTERATION
HYDROTHERMAL SYNTHESIS
HYDROTHERMAL SYSTEMS
MINERALIZATION
MINERALOGY
ORES
ORIGIN
PETROGENESIS
PETROLOGY
PLATE TECTONICS
PRECAMBRIAN ERA
STRATIGRAPHY
SYNTHESIS
TECTONICS