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Complete Global Geologic Map of Io: Insights from Galileo and Voyager Data

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The first comprehensive global geologic map of Io has been produced using data from the Galileo and Voyager missions. It reveals 19 geologic units classified into five categories: Plains (65.8%), Lava flow fields (28.5%), Mountains (3.2%), and Patera floors (2.5%). Hotspots, indicative of volcanic activity, are correlated with various geologic features. The map also notes that superposed diffuse deposits cover ~18% of the surface in multiple colors. This significant work is published by USGS and provides valuable insights into the nature of volcanism on Io.

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Complete Global Geologic Map of Io: Insights from Galileo and Voyager Data

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  1. Global Geologic Map of Io • First complete global geologic map of Io, produced using Galileo and Voyager data • Hotspots (sites of volcanic activity) correlated with types of geologic features • Io has 19 geologic units in 5 classes: Plains (65.8%), Lava flow fields (28.5%), Mountains (3.2%), Patera floors (2.5%). Five types of superposed diffuse deposits cover ~18% of surface: Red (8.6%), White (6.9%), Yellow (2.1%), Black (0.6%), Green (~0.01%) • 425 paterae cover 2.5% of surface, but correlate with 64% of hot spots => Dominance of silicate volcanism, in the form of lava lakes in volcanic craters • Only 2% of hot spots correlate with Bright Flows => Minimal active sulfur volcanism Published by USGS, available from: http://pubs.usgs.gov/sim/3168/ • Primary results from mapping published in 2011 Icarus paper: Williams, D.A., L.P. Keszthelyi, D.A. Crown, J.A. Yff, W.L. Jaeger, P.M. Schenk, P.E. Geissler, T.L. Becker, 2011, Volcanism on Io: Insights from global geologic mapping, Icarus, v. 214, p. 91-112.

  2. Global Geologic Map of Io Published by USGS, available from: http://pubs.usgs.gov/sim/3168/ • First complete global geologic map of Io, produced using Galileo and Voyager data • Hotspots (sites of volcanic activity) correlated with types of geologic features • Io has 19 geologic units in 5 classes: Plains (65.8%), Lava flow fields (28.5%), Mountains (3.2%), Patera floors (2.5%). Five types of superposed diffuse deposits cover ~18% of surface: Red (8.6%), White (6.9%), Yellow (2.1%), Black (0.6%), Green (~0.01%) • 425 paterae cover 2.5% of surface, but correlate with 64% of hot spots => Dominance of silicate volcanism, in the form of lava lakes in volcanic craters • Only 2% of hot spots correlate with Bright Flows => Minimal active sulfur volcanism • Primary results from mapping published in 2011 Icarus paper: Williams, D.A., L.P. Keszthelyi, D.A. Crown, J.A. Yff, W.L. Jaeger, P.M. Schenk, P.E. Geissler, T.L. Becker, 2011, Volcanism on Io: Insights from global geologic mapping, Icarus, v. 214, p. 91-112.

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