New! Sign up for our free email newsletter.
Science News
from research organizations

Mars didn't dry up in one go

Date:
April 8, 2021
Source:
CNRS
Summary:
A research team has discovered that the Martian climate alternated between dry and wetter periods, before drying up completely about 3 billion years ago.
Share:
FULL STORY

The Perseverance rover has just landed on Mars. Meanwhile, its precursor Curiosity continues to explore the base of Mount Sharp (officially Aeolis Mons), a mountain several kilometres high at the centre of the Gale crater. Using the telescope on the ChemCam instrument to make detailed observations of the steep terrain of Mount Sharp at a distance, a French-US team headed by William Rapin, CNRS researcher at the Institut de Recherche en Astrophysique et Planétologie (CNRS/Université Toulouse III/CNES), has discovered that the Martian climate recorded there alternated between dry and wetter periods, before drying up completely about 3 billion years ago.

Spacecraft in orbit around Mars had already provided clues about the mineral composition of the slopes of Mount Sharp. But now, ChemCam has successfully made detailed observations of the sedimentary beds from the planet's surface, revealing the conditions under which they formed. Moving up through the terrain observed, which is several hundred metres thick, the types of bed change radically. Lying above the lake-deposited clays that form the base of Mount Sharp, wide, tall, cross-bedded structures are a sign of the migration of wind-formed dunes during a long, dry climate episode.

Higher up still, thin alternating brittle and resistant beds are typical of river floodplain deposits, marking the return of wetter conditions. The climate of Mars therefore likely underwent several large-scale fluctuations between dry conditions and river and lake environments, until the generally arid conditions observed today took hold. During its extended mission, Curiosity is scheduled to climb the foothills of Mount Sharp and drill into its various beds. It will test this model, characterise in more details how the ancient climate evolved, and possibly understand the origin of these major fluctuations.

Note: The other team members work at the Laboratoire de géologie de Lyon : Terre, Planètes, Environnement (CNRS/ENS de Lyon/Université Claude Bernard Lyon 1) and the Laboratoire de Planétologie et Géodynamique (CNRS/Université de Nantes/Université d'Angers) in France; at UC Santa Cruz, US Geological Survey, California Insitute of Technoloy and Los Alamos National Laboratory in the USA.


Story Source:

Materials provided by CNRS. Note: Content may be edited for style and length.


Journal Reference:

  1. W. Rapin, G. Dromart, D. Rubin, L. Le Deit, N. Mangold, L.A. Edgar, O. Gasnault, K. Herkenhoff, S. Le Mouélic, R.B. Anderson, S. Maurice, V. Fox, B.L. Ehlmann, J.L. Dickson, R.C. Wiens. Alternating wet and dry depositional environments recorded in the stratigraphy of Mount Sharp at Gale crater, Mars. Geology, 2021; DOI: 10.1130/G48519.1

Cite This Page:

CNRS. "Mars didn't dry up in one go." ScienceDaily. ScienceDaily, 8 April 2021. <www.sciencedaily.com/releases/2021/04/210408131457.htm>.
CNRS. (2021, April 8). Mars didn't dry up in one go. ScienceDaily. Retrieved June 16, 2024 from www.sciencedaily.com/releases/2021/04/210408131457.htm
CNRS. "Mars didn't dry up in one go." ScienceDaily. www.sciencedaily.com/releases/2021/04/210408131457.htm (accessed June 16, 2024).

Explore More

from ScienceDaily

MORE COVERAGE

RELATED STORIES