Source of excess sulfur in volcanic eruptions
The amounts of sulfur released in explosive volcanic eruptions
are often orders of magnitude larger than those expected from
the degassing of the erupted SiO2-rich magma. Hans Keppler (Bayreuth University, DE) reports a
study to test whether small amounts of hydrous fluid in the magma
chamber could extract most of the sulfur out of the entire reservoir,
the test involving measurement of the partition coefficient of
sulfur between hydrous fluids and water-saturated SiO2-rich silicate melts.