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Record 11 of 8701
Vapor Pressure, Vapor Composition and Fractional Vaporization of High Temperature Lavas on Io
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Author and Affiliation:
Fegley, B., Jr.(Washington Univ., Planetary Chemistry Lab., Saint Louis, MO, United States)
Schaefer, L.(Washington Univ., Planetary Chemistry Lab., Saint Louis, MO, United States)
Kargel, J. S.(Geological Survey, Flagstaff, AZ, United States)
Abstract: Observations show that Io's atmosphere is dominated by SO2 and other sulfur and sulfur oxide species, with minor amounts of Na, K, and Cl gases. Theoretical modeling and recent observations show that NaCl, which is produced volcanically, is a constituent of the atmosphere. Recent Galileo, HST and ground-based observations show that some volcanic hot spots on Io have extremely high temperatures, in the range 1400-1900 K. At similar temperatures in laboratory experiments, molten silicates and oxides have significant vapor pressures of Na, K, SiO, Fe, Mg, and other gases. Thus vaporization of these species from high temperature lavas on Io seems likely. We therefore modeled the vaporization of silicate and oxide lavas suggested for Io. Our results for vapor chemistry are reported here. The effects of fractional vaporization on lava chemistry are given in a companion abstract by Kargel et al.
Publication Date: Jan 01, 2003
Document ID:
20030110606
(Acquired Dec 13, 2003)
Subject Category: INORGANIC, ORGANIC AND PHYSICAL CHEMISTRY
Document Type: Conference Paper
Publication Information: Lunar and Planetary Science XXXIV; (LPI-Contrib-1156); (SEE 20030110578)
Contract/Grant/Task Num: NAG5-11958
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: Washington Univ.; Planetary Chemistry Lab.; Saint Louis, MO, United States
Description: 2p; In English; Original contains black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution under U.S. Government purpose rights; under cooperative agreement NCC5-679
NASA Terms: IO; LAVA; VAPOR PRESSURE; VAPORIZING; COMPOSITION (PROPERTY); HIGH TEMPERATURE; GALILEO SPACECRAFT; BASALT; EQUILIBRIUM; VOLCANOES; OXIDES; SILICATES; SULFUR DIOXIDES
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