Position of the Au deposit Hodrusa in the geologic and metallogenic evolution of the Stiavnica stratovolcano (Slovakia)

摘要

The low sulphidation epithermal Au-mineralization took place in the caldera stage of a large andesite stratovolcano. It was preceded by porphyry, skarn and disseminated mineralizations related to sub-volcanic intrusions and postdated by an extensive system of base- and precious-metal epithermal veins related to a late stage resurgent horst in the centre of the caldera and rhyolite magmatism. The early intrusion related mineralizations and younger low sulfidation epithermal mineralizations are related in space by a high-level magma chamber that was evolving towards rhyolitic composition by an extensive anatexis. The caldera collapse has caused the change in fluid flow pattern and mineralization style.