Mineralogy and sulphur isotope characteristics of a massive sulphide boulder, Galapagos Rift, 85°55′W

Knott, Richard, Fallick, Anthony E., Rickard, David ORCID: https://orcid.org/0000-0002-4632-5711 and Backer, Harald 1995. Mineralogy and sulphur isotope characteristics of a massive sulphide boulder, Galapagos Rift, 85°55′W. Parson, L.M., Walker, C.L. and Dixon, D.R., eds. Hydrothermal Vents and Processes, Special Publications, London: Geological Society, pp. 207-222. (10.1144/GSL.SP.1995.087.01.17)

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Abstract

The submarine hydrothermal sulphide deposits of the Galapagos Rift are characterized by being exceptionally Cu-rich. Fe- and Cu-Fe sulphides are extremely heterogeneous, display granular textures and evidence of open space growth. Core was examined from a 1.5 m diameter massive sulphide boulder collected by TV grab on the GARIMAS II cruise. The main growth stage is dominated by pyrite and chalcopyrite, forming granular aggregates from <1 mm to >5 cm. These sulphides have δ34S from +2.7 to + 5.5‰. The Fe-Cu sulphides are modified by minor seawater oxidation and a late stage marcasite-sphalerite-galena-barite assemblage. δ34S varies along the core in a systematic manner and there appears to be an isotopically heavy deviation from the modal +3.9‰. This is related to particular zones and suggests a second, isotopically distinct S source, which is interpreted to be a hydrothermal diagenetic solution derived from a shallow seawater-hydrothermal circulation system.

Item Type:	Book Section
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	Geological Society
Last Modified:	25 Oct 2022 13:30
URI:	https://orca.cardiff.ac.uk/id/eprint/120016

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