Dry Valleys (Mars)
This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Dry Valleys (Mars) | |
|---|---|
.png) | |
| Name | Dry Valleys (Mars) |
| Feature type | Valley system |
| Coordinate region | Mars |
| Discovered by | Various missions |
Dry Valleys (Mars) Dry Valleys (Mars) are a class of martian valley networks and trench-like depressions located across the Valles Marineris quadrangle, Tharsis quadrangle, Amazonis Planitia, and other regions on Mars. Characterized by largely desiccated channels, patterned troughs, and exposed bedrock, these features have been mapped and interpreted by missions from Mariner 9 through Mars Reconnaissance Orbiter and Mars Express. They inform investigations by teams at institutions such as the Jet Propulsion Laboratory, European Space Agency, and NASA centers.
Overview and Definition
Dry Valleys on Mars denote valley systems lacking persistent surface water and often exhibiting aeolian reworking, integrative incision, and erosion products. Studies by research groups at California Institute of Technology, Massachusetts Institute of Technology, Arizona State University, and the University of Arizona classify these features alongside valley networks, outflow channels, and katabatic troughs mapped by United States Geological Survey and international collaborators. Terminology is used in publications in journals such as Science (journal), Nature (journal), Journal of Geophysical Research: Planets, and Icarus (journal).
Geology and Morphology
Morphologies include dendritic valley networks, linear troughs, amphitheater-headed gullies, and inverted channels preserved in sedimentary layers. Remote sensing instruments like HiRISE, CTX, THEMIS, and CRISM have revealed stratigraphy, sedimentary facies, and mineralogies including phyllosilicates and sulfates comparable to analog sites studied by teams at Smithsonian Institution, Imperial College London, and Caltech. Structural controls from tectonic provinces such as Valles Marineris, Noachis Terra, and Hellas Planitia influence valley orientation, while volcanic provinces including Olympus Mons and the Tharsis Montes contribute material and heat flow affecting morphology.
Formation Mechanisms
Hypotheses for Dry Valley formation include catastrophic outflow floods tied to cryospheric release during episodes associated with Late Heavy Bombardment, glaciofluvial incision during Amazonian climate excursions, groundwater sapping driven by aquifers linked to Ares Vallis-scale discharge, and progressive aeolian erosion documented by teams from Brown University and University College London. Numerical models developed by researchers at California Institute of Technology and ETH Zurich simulate fluvial erosion, periglacial processes observed on Earth, and volcanic-tectonic interactions akin to those in Iceland and Antarctica analogue studies led by British Antarctic Survey scientists.
Distribution and Notable Examples
Dry Valleys occur globally on Mars with concentrations in the southern highlands, Valles Marineris, and the Cerberus Fossae region. Notable examples include the valley systems adjacent to Valles Marineris, the inverted channels in Eberswalde Crater and Jezero Crater, the gullied slopes of Gorgonum Chaos, the erosional features near Ariadnes Colles, and the linear troughs of Kasei Valles and Mawrth Vallis. Investigations of layered deposits in Meridiani Planum and sedimentary fans studied by teams from Cornell University and Purdue University provide context for depositional histories. Mapping campaigns by USGS, European Space Agency, and researchers at University of Oxford and University of Nantes catalog morphological variants.
Climate and Environmental Conditions
The climatic context for Dry Valley development spans Noachian fluvial episodes, Hesperian volcanism and groundwater activity, and Amazonian cold-arid conditions preserved in the stratigraphic record. Atmospheric interactions with regolith documented by Mars Global Surveyor, Mars Odyssey, and MAVEN have influenced oxidation states and mineralogy measured by the Curiosity rover and Perseverance rover science teams from NASA Jet Propulsion Laboratory and collaborating institutions such as California Institute of Technology and Massachusetts Institute of Technology. Contemporary microclimates analogous to terrestrial analogs in McMurdo Dry Valleys, Atacama Desert, and Antarctic Dry Valleys inform hypotheses tested by groups at ENEA, University of Colorado Boulder, and University of Canterbury.
Scientific Investigations and Missions
Dry Valleys have been focal targets for orbital spectroscopy and landed investigations. Orbital platforms including Mariner 9, Mars Global Surveyor, Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, and MAVEN provided imagery and compositional mapping. Landed missions such as Viking program, Pathfinder, Spirit, Opportunity, Curiosity, and Perseverance have characterized sedimentology, geochemistry, and habitability proxies. Investigators from institutions including Jet Propulsion Laboratory, NASA Ames Research Center, CNES, DLR, and universities worldwide continue field analog campaigns tied to sample-caching strategies and proposed sample-return plans coordinated with Mars Sample Return architecture.
Astrobiological and Planetary Science Implications
Dry Valleys hold implications for past habitability, preservation of biosignatures, and the martian hydrologic cycle. Mineral assemblages detected by CRISM and in situ laboratories like SAM and CheMin on Curiosity suggest past aqueous alteration potentials analogous to terrestrial biosignature-bearing settings studied by USGS and Woods Hole Oceanographic Institution. The search for organics and microfossil proxies involves cross-disciplinary teams from Smithsonian Institution, Max Planck Institute for Solar System Research, California Institute of Technology, and European Space Agency investigators. Understanding Dry Valley evolution refines models of martian climate transition, influences selection of future landing sites considered by NASA, ESA, Roscosmos, ISRO, and other space agencies, and informs planetary protection policies developed by COSPAR and Committee on Space Research.
Category:Mars geography