Deltas and valley networks on Mars: implications for a global hydrosphere
نویسندگان
چکیده
institution, for non-commercial research, and educational use. This includes without limitation use in instruction at your institution, distribution to specific colleagues, and providing a copy to your institution's administrator. All other uses, reproduction and distribution, including without limitation commercial reprints, selling or licensing copies or access, or posting on open internet sites, your personal or institution's website or repository, are prohibited. For exceptions, permission may be sought for such use through Elsevier's permissions site at: Deltas and valley networks on Mars: implications for a global hydrosphere.
منابع مشابه
Possible Primordial Oceans on Mars: Evidence from the Global Distribution of Ancient Deltas?
Introduction: Marine deltas are among the most typical coastal landforms on Earth. They exhibit a large diversity of morphology as a result of the combination of several factors, including climate, geology, river characteristics, and basin bathymetry and waves regime. Nonetheless, they share the characteristic of being formed approximately at the same elevation all over the planet, the mean glo...
متن کاملValley network-fed, open-basin lakes on Mars: Distribution and implications for Noachian surface and subsurface hydrology
a r t i c l e i n f o a b s t r a c t A new catalog of 210 open-basin lakes (lakes with outlet valleys) fed by valley networks shows that they are widely distributed in the Noachian uplands of Mars. In order for an outlet valley to form, water must have ponded in the basin to at least the level of the outlet. We use this relationship and the present topography to directly estimate the minimum a...
متن کاملFluvial sedimentary deposits on Mars: Ancient deltas in a crater lake in the Nili Fossae region
[1] New spacecraft observations in the Nili Fossae region of Mars reveal two valley networks (!80 and !200 km long) that each formed distributary fans as they entered an ancient 40-km diameter impact crater. An outlet channel on the eastern crater rim, lying at an elevation above the fans, suggests these fans formed as subaqueous deltas in a crater lake. Water flowing in the valley networks ent...
متن کاملGLOBAL DISTRIBUTION OF PUTATIVE MARTIAN DELTAS IN THE LIGHT OF HRSC AND HiRISE INSTRUMENTS
Introduction: Several lines of evidence (e.g. drainage networks, outflow channels, evaporites), including the well-documented record of several and diverse delta-like deposits [1-11], imply the occurrence on ancient Mars of environmental conditions supportive of relatively persistent hydrological activity. However, it is still unclear whether the water history of the planet was predominantly ch...
متن کاملAn intense terminal epoch of widespread fluvial activity on early Mars: 2. Increased runoff and paleolake development
[1] To explain the much higher denudation rates and valley network development on early Mars (> 3.6 Gyr ago), most investigators have invoked either steady state warm/wet (Earthlike) or cold/dry (modern Mars) end-member paleoclimates. Here we discuss evidence that highland gradation was prolonged, but generally slow and possibly ephemeral during the Noachian Period, and that the immature valley...
متن کامل