Geologic and mineralogic mapping of Aram Chaos: Evidence for a water-rich history

Timothy D. Glotch, Philip Christensen

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

The Aram Chaos crater on Mars contains gray, crystalline hematite within a stack of layered sediments. The Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES) and Odyssey Thermal Emission Imaging System (THEMIS) were used in conjunction with data from the MGS Mars Orbital Laser Altimeter (MOLA) and the MGS Mars Orbital Camera (MOC) instruments to investigate the nature of the hematite deposits in Aram Chaos. Superposition relationships indicate that the layered sediments in Aram Chaos were deposited subsequent to the formation of the chaotic terrain. This observation, along with the possible detection of sulfates and relatively high abundance of phyllosilicates associated with the layered units in Aram Chaos, provides evidence for the formation of the hematite-bearing units in Aram Chaos in a water-rich environment. Although there are several similarities between the hematite-bearing units in Aram Chaos and Meridiani Planum, an estimated age difference of 0.7-1.0 Gyr exists between them. This indicates that either a stable, thick atmosphere was present well into the Hesperian, or, more likely, that episodic catastrophic release of water provided a temporary environment for deposition of the Aram Chaos hematite unit similar to what existed for the deposition of the Meridiani Planum hematite unit close to 1 Gyr earlier.

Original languageEnglish (US)
Article numberE09006
Pages (from-to)1-21
Number of pages21
JournalJournal of Geophysical Research E: Planets
Volume110
Issue number9
DOIs
StatePublished - Sep 20 2005

Fingerprint

chaotic dynamics
Chaos theory
hematite
chaos
histories
Water
Mars Global Surveyor
history
Mars
water
Bearings (structural)
mars
Temazepam
thermal emission
Sediments
sediments
laser altimeters
orbitals
Aneroid altimeters
phyllosilicate

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Geologic and mineralogic mapping of Aram Chaos : Evidence for a water-rich history. / Glotch, Timothy D.; Christensen, Philip.

In: Journal of Geophysical Research E: Planets, Vol. 110, No. 9, E09006, 20.09.2005, p. 1-21.

Research output: Contribution to journalArticle

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