T16. The remarkable sulfur properties


Congressi SGI-SIMP

Sulfur is widely distributed on Earth, participating in a variety of geo- and biochemical processes. Elemental sulfur (S0) occurs in evaporite formations and in volcanic settings. In the past, climate disruption followed massive SO2 injection into the atmosphere, trough eruptive plumes. Due to its complex polymerization behavior, pure S0 viscosity is highly temperature dependent, experiencing a 10,000 fold -increase at ~160_C, until a maximum around 186-188oC. This viscosity pattern is not respected in the presence of organics, H2S(x), ammonia, halogens. This behavior remains poorly investigated, despite the high impurity of volcanic sulfur. S-layers accumulated at depth within volcanoes could explain contrasting geochemical signals at the surface following the scrubbing of critical species. In the ultimate case, S-viscosity variations could seal the volcanic system, leading to its overpressurization, and unheralded failure. Several eruptions were attributed to a system sealing at depth. Our knowledge of these processes is poor. Implications for hazard assessment are envisaged.
This session invites all studies that can improve the knowledge on S-properties in any state. Quantitative results, in situ sampling, mapping, continuous direct monitoring, remote sensing analyses. Experimental findings on S-viscosity at different pressure (mostly low) and temperatures (typical for hydrothermal systems) are particularly welcome
CONVENERS: Teresa Scolamacchia (A.S.S.E.T.- Regione Puglia), Jacopo Cabassi (CNR Firenze)
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