Sb–Au-bearing chalcedonies in hot geothermal systems: insights from the jasperoids of Poggio Peloso (southern Tuscany, Italy)

Detailed characterization was performed on the chalcedonies from the jasperoids of the Pietratonda–Poggio PelosoSb–Au deposit (southern Tuscany, Italy). The main purpose was to retrieve information on the geothermal fluids that formed the chalcedonies and the source of antimony concentrations. Investigations were performed using optical microscopy, laser ablation inductively coupled plasma mass spectroscopy and X-ray diffraction on both the chalcedonies and the lithotypes cropping out in the area. The results obtained allow the chalcedonies of Pietratonda–Poggio Peloso to be described as a unicum, basedontheveryhighcontents of Sbthatdonotfindacomparisonintheliterature.Thetexturesshowedmultiplegenerations of silicathatagreewellwithanenvironmentcharacterizedbymultipleinjectionsofmineralizing solutions, bearing variable physico chemical characteristics. The transport likely took place in an alkaline environment, while the acidification of the water may have favoured the precipitation at varying temperatures but not higher than 225°C. The rocks from which the constituents may have been leached are the hosting carbonates and the surrounding metamorphic rocks. Among the examined rocks, the metamorphic rocks showed the most numerous and significant correspondences with the chalcedonies and were the only ones which discrete amounts of gold contents were found.