When one tectonic plate sinks beneath another, it generates magmas rich in volatiles such as water, sulphur and chlorine. As these magmas ascend, they release magmatic fluids, in which sulphur and chlorine bind to metals such as gold and copper, and transport these metals towards the surface of the Earth.
As the extreme conditions relevant to natural magmas are very difficult to reproduce in the laboratory, the precise role of the different forms of sulphur in metal transport remains highly debated. However, an innovative approach has demonstrated that sulphur, in its bisulphide form, is crucial for the transport of gold in magmatic fluids.
''By carefully choosing our laser wavelengths, we also showed that in previous studies, the amount of sulphur radicals in geologic fluids was severely overestimated and that the results of the 2011 study were in fact based on a measurement artefact, putting an end to this debate,'' says Stefan Farsang. The conditions leading to the formation of important precious metal ore deposits have now been clarified.
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