Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - A model for large-scale volcanic plumes on Io: Implications for eruption rates and interactions between magmas and near-surface volatiles.
AU - Cataldo, Enzo
AU - Wilson, Lionel
AU - Lane, Steve
AU - Gilbert, Jennie
N1 - Copyright (2002) American Geophysical Union.
PY - 2002
Y1 - 2002
N2 - Volcanic plumes deposit magmatic pyroclasts and SO2 frost on the surface of Io. We model the plume activity detected by Galileo at the Pillan and Pele sites from 1996 to 1997 assuming that magmatic eruptions incorporate liquid SO2 from near-surface aquifers intersecting the conduit system and that the SO2 eventually forms a solid condensate on the ground. The temperature and pressure at which deposition of solid SO2 commences in the Ionian environment and the radial distance from the volcanic vent at which this process appears to occur on the surface are used together with observed vertical heights of plumes to constrain eruption conditions. The temperature, pressure, and density of the gas–magma mixtures are related to distance from the vent using continuity and conservation of energy. Similar eruption mass fluxes of order 5x10^7 kg s^1 are found for both the Pillan and the Pele plumes. The Pele plume requires a larger amount of incorporated SO2 (29–34 mass %) than the Pillan plume (up to 6 mass%). Implied vent diameters range from c. 90m at Pillan to c. 500 m at Pele. The radial extents of the optically dense, isothermal, incandescent parts of the eruption plumes immediately above the vents are 100 m at Pillan and 1300 m at Pele. Gas pressures in the vents are 20 kPa at Pillan and 2 kPa at Pele and the eruption conditions appear to be supersonic in both cases, though only just so at Pele.
AB - Volcanic plumes deposit magmatic pyroclasts and SO2 frost on the surface of Io. We model the plume activity detected by Galileo at the Pillan and Pele sites from 1996 to 1997 assuming that magmatic eruptions incorporate liquid SO2 from near-surface aquifers intersecting the conduit system and that the SO2 eventually forms a solid condensate on the ground. The temperature and pressure at which deposition of solid SO2 commences in the Ionian environment and the radial distance from the volcanic vent at which this process appears to occur on the surface are used together with observed vertical heights of plumes to constrain eruption conditions. The temperature, pressure, and density of the gas–magma mixtures are related to distance from the vent using continuity and conservation of energy. Similar eruption mass fluxes of order 5x10^7 kg s^1 are found for both the Pillan and the Pele plumes. The Pele plume requires a larger amount of incorporated SO2 (29–34 mass %) than the Pillan plume (up to 6 mass%). Implied vent diameters range from c. 90m at Pillan to c. 500 m at Pele. The radial extents of the optically dense, isothermal, incandescent parts of the eruption plumes immediately above the vents are 100 m at Pillan and 1300 m at Pele. Gas pressures in the vents are 20 kPa at Pillan and 2 kPa at Pele and the eruption conditions appear to be supersonic in both cases, though only just so at Pele.
U2 - 10.1029/2001JE001513
DO - 10.1029/2001JE001513
M3 - Journal article
VL - 107
SP - 5109
JO - Journal of Geophysical Research: Planets
JF - Journal of Geophysical Research: Planets
SN - 2169-9100
IS - E11
ER -