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Updated: May 6, 2026

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Recent ice ages on Mars.

James W Head1, John F Mustard, Mikhail A Kreslavsky

  • 1Department of Geological Sciences, Brown University, Providence, Rhode Island 02912, USA. James_Head@brown.edu

Nature
|December 20, 2003
PubMed
Summary
This summary is machine-generated.

Mars experienced a recent ice age between 2.1 and 0.4 million years ago, evidenced by widespread dusty ice deposits. This Martian ice age featured warmer poles and equatorward dust transport, unlike Earth's ice ages.

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Area of Science:

  • Planetary Science
  • Climate Science
  • Geology

Background:

  • Earth's ice ages are driven by orbital variations.
  • Mars exhibits layered, dusty, water-ice-rich deposits across hemispheres.
  • These deposits are latitude-dependent and metres thick.

Purpose of the Study:

  • To investigate the formation and timing of Martian ice-rich deposits.
  • To understand the role of orbital variations in Martian climate history.
  • To compare Martian ice ages with those on Earth.

Main Methods:

  • Analysis of Mars exploration data on mantling deposits.
  • Modeling of water ice and dust stability under varying obliquity.
  • Geological dating of deposit formation periods.

Main Results:

  • Evidence suggests Martian ice age occurred from 2.1 to 0.4 million years ago.
  • Deposits emplaced symmetrically down to ~30 degrees latitude in response to obliquity changes (30-35 degrees).
  • Mars is currently in an interglacial period with retreating ice deposits.

Conclusions:

  • Martian ice ages are characterized by warmer polar climates.
  • Enhanced equatorward transport of water and dust occurred during Martian ice ages.
  • Unlike Earth, Mars shows widespread mid-latitude deposits from ice ages.