Dark Dune Spots: Possible Biomarkers on Mars?

  title={Dark Dune Spots: Possible Biomarkers on Mars?},
  author={Tibor G{\'a}nti and Andr{\'a}s Jr. Horv{\'a}th and Sz. B{\'e}rczi and A. Gesztesi and E{\"o}rs Szathm{\'a}ry},
  journal={Origins of life and evolution of the biosphere},
Dark Dune Spots (DDSs) are transitional geomorphologic formations in the frost-covered polar regions of Mars. Our analysis of the transformations and arrangements of subsequent stages of DDSs into time sequence revealed their: (i) hole-like characteristics,(ii) development and formation from the bottom of the frosted layer till the disapperance of the latter, (iii) repeated (seasonal and annual) appearance in a pattern of multiple DDSs on the surface, and (iv) probable origin. We focused our… 
Seepage Phenomena Originating from Dark Dune Spots at Southern and Northern Polar Region of Mars
Important direction in Martian surface investigations is to find recent activity and effect of water on the atmospheric and soil conditions. Our Mars Astrobiology Group (in Budapest Collegium,
Water ice in the dark dune spots of Richardson crater on Mars
Analysis of dark albedo features on a southern polar dune field of Mars.
With better knowledge of sub-ice temperatures that result from extended polar solar insolation and the heat insulator capacity of water vapor and water ice, future models and measurements may show that ephemeral water could appear and flow under the surface ice layer on the dunes today.
Evidence for Water by Mars Odyssey is Compatible with a Biogenic DDS-Formation Process
The neutron measurements of the Mars Odyssey spacecraft provided evidence for some form of water in the upper layer of the surface of the Southern Polar Region of Mars. This is compatible with the
Plate tectonics and the detection of land-based biosignatures on Mars and extrasolar planets
  • J. Parnell
  • Geology
    International Journal of Astrobiology
  • 2005
On Earth, surface detritus has a quartz-rich mineralogy as a consequence of plate tectonics. Rocky planets without plate tectonics, like Mars, have surface detritus derived from volcanic rocks. There
Hypothetical Time Sequence of the Morphological Changes in Global and Local Levels of the Dark Dune Spots in Polar Region of Mars
LOCAL LEVELS OF THE DARK DUNE SPOTS IN POLAR REGION OF MARS. Gánti T.(1), Sz. Bérczi (1,2), A. Horváth (1,3), A. Kereszturi (1,4), T. Pócs (1), A. Sik (1,4), E. Szathmáry (1,6); (1) Collegium


Morphological Analysis of the Dark Dune Spots on Mars: New Aspects in Biological Interpretation
The Dark Dune Spots of the southern polar region of Mars are analyzed on MGS MOC images to show that the formation of DDS begins from the bottom of the frost layer, at the frost/soil boundary.
Probable Evidences of Recent Biological Activity on Mars: Appearance and Growing of Dark Dune Spots in the South Polar Region
Morphological analysis of dark dune spots (DDSs) on the intracrater dark sand sheets in the southern polar region of Mars has led to a surprising conclusion. The most recently suggested process of
Spider-Ravine Models and Plant-like Features on Mars - Possible Geophysical and Biogeophysical Modes of Origin
1. Introduction MGS imaging has revealed that the South Polar region of Mars is littered with structures that exhibit the convincing characteristic appearance of trees and plants (Fig. 1a-i; Fig.
The Role of Eolian Processes in Forming Surface Features of the Martian Polar Layered Deposits
Abstract The major topographic features of the martian polar layered deposits include the conspicuous spiral troughs, subtle undulations, broad reentrants (chasma), steep, arcuate scarps, and dune
Narrow Gullies over High Sand Dunes on Mars: Evidence for Flows Triggered by Liquid Water Near Surface
Background: The observation of recent gullies on Mars was one of the more unexpected discoveries of the Mars Observer Camera (MOC) aboard Mars Global Surveyor [1]. The characteristics of these
The ``Inca City'' Region of Mars: Test Field for Dark Dune Spots Origin
We analyzed the Dark Dune Spots (DDSs) in the “Inca City” Region from more than 60 MGS MOC images. On high-resolution MOC images we followed the shape, pattern changes, fading and reappearance of
Eolian deposits and dunes on Mars
A complex of coalescing ridges and diverse marginal features observed in Mariner 9 pictures of the Hellespontus region of Mars is identified as a dune mass. Many other possible dune features are
Questioning the evidence for Earth's oldest fossils
The purported microfossil-like structure is reinterpreted as secondary artefacts formed from amorphous graphite within multiple generations of metalliferous hydrothermal vein chert and volcanic glass, and a Fischer–Tropsch-type synthesis of carbon compounds and carbon isotopic fractionation is inferred for one of the oldest known hydroThermal systems on Earth.
Spring defrosting in the Russel crater dune field - recent surface runoff within the last martian year?
Rill erosion on a dune slope in the Russell Crater dune field was detected on a high resolution Mars Orbiter Camera (MOC)-NA image from the latest public release of MOC-data (October, 2001). The