Mid-latitude Glaciers On Mars Discovered, MGS and MO |
Mid-latitude Glaciers On Mars Discovered, MGS and MO |
Oct 17 2005, 10:10 PM
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Member Group: Members Posts: 531 Joined: 24-August 05 Member No.: 471 |
--- New high-resolution images of mid-latitude Mars are revealing glacier-formed landscapes far from the Martian poles, says a leading Mars researcher. ---
http://www.geosociety.org/news/pr/05-37.htm http://www.universetoday.com/am/publish/mi...s.html?17102005 -------------------- - blue_scape / Nico -
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Oct 19 2005, 03:36 AM
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
Interesting idea... How much overburden would be required to provide enough pressure to depress the melting point of buried ice and create mud flows? Could you post a link to inverted crater images?
-------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Guest_Richard Trigaux_* |
Oct 19 2005, 07:39 AM
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Guests |
QUOTE (CosmicRocker @ Oct 19 2005, 03:36 AM) This one known as the "Inca city" is really astonishing. My explanation is that this very ancient impact filled with molten lava some faults into a sandy terrain. There are many other such features. QUOTE (CosmicRocker @ Oct 19 2005, 03:36 AM) Interesting idea... How much overburden would be required to provide enough pressure to depress the melting point of buried ice and create mud flows? 1000 bars, or about 10kms deep on Mars, makes water freeze at -10°C, the lowest possible temp for pure liquid water. So this alone cannot explain the massive mud flows observed into many places. To explain this we must invoke geothermal heating, or liquid carbon dioxid, the later can turn to liquid at only 4 bars, some tens of metres deep on Mars. The most common hypothesis is that there are huge layers of sand/dust on Mars, soaked with a mixture of water and carbon dioxid, the whole think frozen and solid like rock. But the undermost parts can turn liquid, from geothermal heating, pressure, or eutectic mixing, resulting into large outbursts of mud or liquids. For instance a volcanic emanation of carbon dioxid could pervade water ice and turn it liquid, much like salt does. |
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Guest_RGClark_* |
Oct 22 2005, 06:23 AM
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QUOTE (Richard Trigaux @ Oct 19 2005, 07:39 AM) This one known as the "Inca city" is really astonishing. My explanation is that this very ancient impact filled with molten lava some faults into a sandy terrain. There are many other such features. 1000 bars, or about 10kms deep on Mars, makes water freeze at -10°C, the lowest possible temp for pure liquid water. So this alone cannot explain the massive mud flows observed into many places. To explain this we must invoke geothermal heating, or liquid carbon dioxid, the later can turn to liquid at only 4 bars, some tens of metres deep on Mars... The latitude of some features are at around 40°N. Surface temperatures can approach 0°C here. Then you only have to worry about having sufficient over pressure for liquid water. Only a few centimeters of soil is required for this. Bob Clark |
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