Hydrothermal alteration facies within the intrusive-hosted Salave gold prospect, NW Spain
Conference
·
· Geol. Soc. Am., Abstr. Programs; (United States)
OSTI ID:6593661
The Salave gold prospect occurs within an Hercynian granodioritic complex intruding Cambro-Ordovician metasediments and a heterogeneous gabbroic body. Mineralization consists mostly of disseminated and veinlet pyrite, arsenopyrite, molybdenite, stibnite, and lesser sphalerite associated with a zoned sequence of hydrothermal alteration. Gold occurs as free particles and/or intergrown with the sulfides. Mathematical appraisal of analytical data suggests that the hydrothermal alteration resulted from largely isochemical redistribution processes imposed on the mineralogy of the host granodiorite by influxes of sporadically boiling fluids rich in CO/sub 2/. Hydrothermal alteration is described in terms of a zonal sequence inward from unaltered host rock through (1) chlorite-sericite alteration-(2) propylitic to advanced propylitic alterations-(3)albitites-(4) an auriferous (greater than or equal to 1g/t Au) sericite-carbonate-albite-(+/-)quartz-sulfide cataclastic facies. The zonation corresponds to increasing carbonatization, sericitization, albitization, desilification, and destruction of the original igneous texture. Aventurine alteration is common and is thought to be the product of late stage hydrothermal oxidizing conditions. Potassic alteration in the form of K-feldspar or biotite was occasionally observed.
- Research Organization:
- BP Minerals Ltd., Edinburgh (England)
- OSTI ID:
- 6593661
- 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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Gold deposits in the late Archaean Nzega-Igunga greenstone belt, central plateau of tanzania
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Mon Dec 31 23:00:00 EST 1984
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Uranium-titanium-phosphorus hydrothermal mineralization in sedimentary rocks
Journal Article
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Mon Nov 30 23:00:00 EST 1981
· Int. Geol. Rev.; (United States)
·
OSTI ID:5777778
Gold deposits in the late Archaean Nzega-Igunga greenstone belt, central plateau of tanzania
Conference
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Mon Dec 31 23:00:00 EST 1984
· Geol. Soc. Am., Abstr. Programs; (United States)
·
OSTI ID:6611339
Related Subjects
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
CAMBRIAN PERIOD
CHLORITE MINERALS
DEVELOPING COUNTRIES
EUROPE
GABBROS
GEOLOGIC AGES
GOLD ORES
GRANITES
GRANODIORITES
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
MINERALIZATION
MINERALOGY
MINERALS
ORDOVICIAN PERIOD
ORES
PALEOZOIC ERA
PLUTONIC ROCKS
ROCK-FLUID INTERACTIONS
ROCKS
SILICATE MINERALS
SPAIN
SULFIDE MINERALS
WESTERN EUROPE
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
CAMBRIAN PERIOD
CHLORITE MINERALS
DEVELOPING COUNTRIES
EUROPE
GABBROS
GEOLOGIC AGES
GOLD ORES
GRANITES
GRANODIORITES
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
MINERALIZATION
MINERALOGY
MINERALS
ORDOVICIAN PERIOD
ORES
PALEOZOIC ERA
PLUTONIC ROCKS
ROCK-FLUID INTERACTIONS
ROCKS
SILICATE MINERALS
SPAIN
SULFIDE MINERALS
WESTERN EUROPE