Mineralogy, sulphur isotope geochemistry and the development of sulphide structures at the Broken Spur hydrothermal vent site, 29 degrees 10'N, Mid-Atlantic Ridge

From: Journal of the Geological Society | Date: September 1, 1998| Author: | Copyright information

I. B. BUTLER1*, A. E. FALLICK2 & R. W. NESBITT1

Abstract: A large collection of hydrothermal sulphides from the Broken Spur hydrothermal vent site, including representative samples of mound sulphide materials, has been characterized using optical mineralogy and sulphur isotope analysis. Young mound sulphides from Broken Spur have a pyrrhotite-- dominated mineralogy unusual for bare ridge vent systems. However, pyrrhotite is metastable and is ultimately converted to iron disulphides. Mature sulphides are indurated, recrystallized and contain abundant quartz. Sulphide mound materials are ...

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