Geologic mapping of the Zal region of Io

Melissa K. Bunte, David Williams, Ronald Greeley

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We produced a regional geologic map of the Zal region of Io's antijovian hemisphere using Galileo mission data. We discuss the geologic features, summarize the map units and structures that are present, discuss the nature of volcanic activity, and present an analysis of the volcanic, tectonic, and gradational processes that affect the region. The Zal region consists of five primary types of geologic materials: plains, mountains, paterae floors, flows, and diffuse deposits. The flows and patera floors are similar, but are subdivided based on uncertainties regarding emplacement environments and mechanisms. The Zal region includes two hotspots detected by Galileo: one along the western scarp of the Zal Patera volcano and one at the Rustam Patera volcano (name submitted to IAU). A third hotspot at the nearby At'am Patera volcano (name submitted to IAU) is the source of diffuse and pyroclastic materials that blanket north Zal Mons. The western bounding scarp of Zal Patera is the location of a fissure vent that is the source of multiple silicate lava flows. The floor of Zal Patera has been partially resurfaced by dark lava flows, although portions of the patera floor appear bright and unchanged during the Galileo mission. This suggests that the floor did not undergo complete resurfacing as a flooding lava lake but does contain a compound flow field. Mountain materials exhibit stages of degradation; lineated material degrades into mottled material. We have explored the possibility that north and south Zal Mons were originally one structure. We propose that strike-slip faulting and subsequent rifting separated the mountain units, opened a fissure which serves as a vent for lava flow, and created a depression which, by further extension during the rifting event, became Zal Patera. With comparison to other regional maps of Io, this work provides insight into the general geologic evolution of Io.

Original languageEnglish (US)
Pages (from-to)354-367
Number of pages14
JournalIcarus
Volume197
Issue number1
DOIs
StatePublished - Sep 2008

Fingerprint

Io
lava
Galileo project
lava flow
mountains
volcanoes
volcano
vents
fissure
rifting
mountain
hot spot
volcanology
blankets
hemispheres
plains
lakes
flow field
tectonics
silicates

Keywords

  • Geologic processes
  • Io
  • Volcanism

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Bunte, M. K., Williams, D., & Greeley, R. (2008). Geologic mapping of the Zal region of Io. Icarus, 197(1), 354-367. https://doi.org/10.1016/j.icarus.2008.04.013

Geologic mapping of the Zal region of Io. / Bunte, Melissa K.; Williams, David; Greeley, Ronald.

In: Icarus, Vol. 197, No. 1, 09.2008, p. 354-367.

Research output: Contribution to journalArticle

Bunte, MK, Williams, D & Greeley, R 2008, 'Geologic mapping of the Zal region of Io', Icarus, vol. 197, no. 1, pp. 354-367. https://doi.org/10.1016/j.icarus.2008.04.013
Bunte MK, Williams D, Greeley R. Geologic mapping of the Zal region of Io. Icarus. 2008 Sep;197(1):354-367. https://doi.org/10.1016/j.icarus.2008.04.013
Bunte, Melissa K. ; Williams, David ; Greeley, Ronald. / Geologic mapping of the Zal region of Io. In: Icarus. 2008 ; Vol. 197, No. 1. pp. 354-367.
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