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Steep-Sided Dome (Io)

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Definition

Circular, relatively flat mesa with a central depression and basal scarp.

Category

A type of volcanic mountain, Io

A type of shield volcano, Io

Synonyms

Dome (Io); Discoid shield; Unusual shield volcano (Schaber 1980)

Morphometry

The more pristine dome (Inachus) is ~150 km wide and ~1.5 km high (Schenk et al. 2001, 2004) with a central pit 2.5–3 km deep (Wilson and Schenk 2002).

Interpretation

Possible shield volcano (Wilson and Schenk 2002) or volcanic dome (Williams et al. 2011).

Formation

Formation models (Schenk et al. 2004):

  1. (1)

    High viscosity flows

  2. (2)

    Erosional remnants of armored circular, radially emplaced lava flows or ash deposits that prevented sublimation or devolatilizing of the underlying material.

Prominent Examples

Inachus and Apis Tholi (Fig. 1).

Fig. 1
figure 1

Inachus (lower) and Apis (upper) Tholi. False color SSI VGR i1639034 Color Merge at 13°S, 348°W. Scale bar 200 km (NASA/JPL)

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References

  • Schaber GG (1980) The surface of Io: geologic units, morphology, and tectonics. Icarus 43:302–333

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  • Schenk PM, Hargitai H, Wilson R, McEwen A, Thomas P (2001) The mountains of Io: global and geological perspectives from Voyager and Galileo. J Geophys Res 106:33201–33222

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  • Schenk PM, Wilson RR, Davies AG (2004) Shield volcano topography and the rheology of lava flows on Io. Icarus 169:98–110

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  • Turtle EP, Keszthelyi LP, McEwen AS et al (2004) The final Galileo SSI observations of Io: orbits G28-I33. Icarus 169:3–28

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  • Williams DA, Keszthelyi LP, Crown DA, Yff JA, Jaeger WL, Schenk PM, Geissler PE, Becker TL (2011) Geologic map of Io. U.S. geological survey scientific investigations map 3168, scale 1:15,000,000

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  • Wilson RR, Schenk PM (2002) From Tohil to Inachus: an Ionian topography progress report. Lunar Planet Sci XXXIII, abstract 1995, Houston

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Authors and Affiliations

  1. Planetary Science Research Group, Institute of Geography and Earth Sciences, Eötvös Loránd University, Budapest, Hungary

    Henrik Hargitai

Authors
  1. Henrik Hargitai
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Correspondence to Henrik Hargitai .

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Hargitai, H. (2014). Steep-Sided Dome (Io). In: Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9213-9_544-1

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  • DOI: https://doi.org/10.1007/978-1-4614-9213-9_544-1

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  • Publisher Name: Springer, New York, NY

  • Online ISBN: 978-1-4614-9213-9

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