Evolution of the Olympus Mons Caldera, Mars

Peter J. Mouginis-Mark, Mark Robinson

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Synoptic images of the Martian volcano Olympus Mons are of a quality and quantity that are unique for mars and, somewhat surprisingly, are appreciably better than image data that exist for many volcanoes on Earth. Useful information about the evolution of shield volcanoes on Earth can thus be derived from the investigation of this extraterrestrial example. We have used shadow-length measurements and photoclinometrically derived profiles to supplement and refine the topographic map of the Olympus Mons caldera. As much as 2.5 km of collapse took place within the 80×65 km diameter caldera and the elevation of the caldera rim varies by almost 2.0 km (low around the oldest collapse events, high around the youngest). An eight-stage evolutionary sequence for the caldera of Olympus Mons is identified which shows that caldera subsidence was a longterm process rather than the near-instantaneous event that has been interpreted from comparable terrestrial examples. Tectonic features on the caldera floor indicate a transition from an extensional environment (graben formation) around the perimeter of the caldera to compression (ridge formation) towards the caldera center. This transition from a compressional to extensional environment is surprisingly sudden, occurs at a radial distance of ∼17 km from the caldera center, and is import because it can be used to infer that the magma chamber was relatively shallow (thought to be at a depth of <∼16 km beneath the caldera floor; Zuber and Mouginis-Mark 1990). Ample evidence is also found within the Olympus Mons caldera for solidified lava lakes more than 30 km in width, and for the localzed overturning and/or withdrawal of lava within these lakes.

Original languageEnglish (US)
Pages (from-to)347-360
Number of pages14
JournalBulletin of Volcanology
Volume54
Issue number5
DOIs
StatePublished - Jul 1992
Externally publishedYes

Fingerprint

Volcanoes
caldera
Mars
Lakes
Earth (planet)
Subsidence
Tectonics
lava
volcano
shield volcano
tectonic feature
lake
magma chamber
graben
import
subsidence
compression

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Evolution of the Olympus Mons Caldera, Mars. / Mouginis-Mark, Peter J.; Robinson, Mark.

In: Bulletin of Volcanology, Vol. 54, No. 5, 07.1992, p. 347-360.

Research output: Contribution to journalArticle

Mouginis-Mark, Peter J. ; Robinson, Mark. / Evolution of the Olympus Mons Caldera, Mars. In: Bulletin of Volcanology. 1992 ; Vol. 54, No. 5. pp. 347-360.
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