Venusian Channel Formation As A Subsurface Process |
Venusian Channel Formation As A Subsurface Process |
Guest_AlexBlackwell_* |
Jan 27 2006, 04:38 PM
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#1
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Guests |
There's a new and interesting preprint at JGR-Planets in Press:
Lang, Nicholas P.; Hansen, Vicki L. — January 2006 Venusian channel formation as a subsurface process (2005JE002629) PDF [8.7 Mb] |
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Guest_BruceMoomaw_* |
Jan 29 2006, 04:59 PM
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#2
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Guests |
Actually, Mars scientists seem to have always preferred groundwater sapping to surface runoff as a formation mechanism for the valley networks -- although some of them in turn believe that precipitation (either rain or snowmelt) in high regions may have trickled locally underground to start the sapping in the first place, and some believe that there is evidence for BOTH mechanisms, perhaps at different times in Martian history.
The thing about sapping is that it can work using a much smaller total amount of liquid water. It's very easy to visualize an ancient Mars which gradually chilled down and developed a steadily thickening surface layer of permafrost, replacing surface runoff with underground liquid-water sapping at greater and greater depths until the process shut off completely save in the few remaining regions of geothermal activity. |
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