Global mapping of Martian hematite mineral deposits: Remnants of water-driven processes on early Mars

Philip Christensen, R. V. Morris, M. D. Lane, J. L. Bandfield, M. C. Malin

Research output: Contribution to journalArticle

249 Citations (Scopus)

Abstract

Near-global (60° S to 60° N) thermal infrared mapping by the Thermal Emission Spectrometer (TES) on Mars Global Surveyor has revealed unique deposits of crystalline gray hematite (α-Fe2O3) exposed at the Martian surface in Sinus Meridiani, Aram Chaos, and in numerous scattered locations throughout Valles Marineris. The Sinus Meridiani material is an in-place, rock stratigraphic sedimentary unit characterized by smooth, friable layers composed primarily of basaltic sediments with ∼10-15% crystalline gray hematite. This unit has outliers to the north that appear to have formed by stripping and removal. The hematite within Aram Chaos occurs in a sedimentary layer within a closed basin that was likely formed during the basin infilling and predates the formation of nearby chaos and outflow terrains. This unit appears to be exposed by erosion and may be more extensive beneath the surface. The Valles Marineris occurrences are closely associated with the interior layered deposits and may be in place within the layers or eroded sediments. Overall, crystalline gray hematite is extremely uncommon at the surface, yet in all observed locations it is closely associated with layered, sedimentary units. Here we argue that these hematite deposits have formed by a process involving chemical precipitation from aqueous fluids, under either ambient or hydrothermal conditions. Thus the TES mineralogic data provide evidence that liquid water has been stable at or near the surface, probably for millions of years by analogy with terrestrial iron formations, in specific locations on early Mars.

Original languageEnglish (US)
Pages (from-to)23873-23885
Number of pages13
JournalJournal of Geophysical Research E: Planets
Volume106
Issue numberE10
StatePublished - Oct 25 2001

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mineral deposits
Mineral resources
mineral deposit
hematite
mars
Mars
chaotic dynamics
Water
Chaos theory
chaos
sinuses
Deposits
water
deposits
thermal emission
Crystalline materials
Spectrometers
Sediments
sediments
spectrometer

ASJC Scopus subject areas

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

Cite this

Global mapping of Martian hematite mineral deposits : Remnants of water-driven processes on early Mars. / Christensen, Philip; Morris, R. V.; Lane, M. D.; Bandfield, J. L.; Malin, M. C.

In: Journal of Geophysical Research E: Planets, Vol. 106, No. E10, 25.10.2001, p. 23873-23885.

Research output: Contribution to journalArticle

Christensen, Philip ; Morris, R. V. ; Lane, M. D. ; Bandfield, J. L. ; Malin, M. C. / Global mapping of Martian hematite mineral deposits : Remnants of water-driven processes on early Mars. In: Journal of Geophysical Research E: Planets. 2001 ; Vol. 106, No. E10. pp. 23873-23885.
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