Aram Chaos
| Marskrater | |
|---|---|
| Aram Chaos | |
.jpg) En översiktsbild av Aram Chaos | |
| Egenskaper | |
| Koordinater | 2.52˚ N, 21.5˚ V |
| Medeldiameter | 283.81 km |
| Djup | 3.0 km |
| Mars - ( ) | |
Aram Chaos är en nedslagskrater på planeten Mars som har sitt centrum strax norr om Mars ekvator, runt 2,6° N och 21,5° V. Eftersom kratern är gammal så har den under årens lopp påverkats av erosion och olika geologiska förändringsprocesser. Från början hade kratern en diameter på runt 280 kilometer, men är numera en mindre och grundare nedsänkning i det marsianska landskapet. "Chaos" i namnet kommer av den kaotiska röran av platta stenblock, rundade kullar och breda dalar som finns i området. Det kaotiska landskapet beror sannolikt på en dramatisk erodering.
Erosionen har förmodligen skett inifrån planeten, snarare än som ett resultat av t.ex. en störtflod. Kraterns botten tycks ha sjunkit ihop och kollapsat, vilket forskarna tror beror på att is eller vatten under ytan har försvunnit. Förmodligen har vattnet sipprat upp ur marken och blivit kvar i kratern. Vattnet har sedan genom sin kontakt med damm och sten som blåst till Aram Chaos skapat sedimentära bergarter. I takt med att Mars klimat förändrades så tror forskarna att vattnet frös först, för att sedan smälta på ett dramatiskt sätt och på så sätt skapade en djup sjö i kratern. Sedan dränerades sjön genom Aram Vallis, en smal kanal i kraterns östra del. Runt 2,7 miljarder år sedan skedde ytterligare en sedimenteringsfas. Eftersom man har hittat mineralet hematit i kratern så kan man dra slutsatsen att sedimenteringen skett i en blöt miljö.[1]
Galleri
(c) NASA/JPL/UA, CC BY-SA 2.0Klippor i Aram Chaos
Kraterns s.k. "badlands"
Stenblock i Aram Chaos
Aram Chaos östra del
Referenser
- ^ Sparrow, Giles (2015). Mars : the ultimate guide to the Red Planet. ISBN 1-62365-856-X. OCLC 911095728. https://www.worldcat.org/oclc/911095728
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Media som används på denna webbplats
NASA's Hubble Space Telescope took the picture of Mars on June 26, 2001, when Mars was approximately 68 million kilometers (43 million miles) from Earth — the closest Mars has ever been to Earth since 1988. Hubble can see details as small as 16 kilometers (10 miles) across. The colors have been carefully balanced to give a realistic view of Mars' hues as they might appear through a telescope. Especially striking is the large amount of seasonal dust storm activity seen in this image. One large storm system is churning high above the northern polar cap (top of image), and a smaller dust storm cloud can be seen nearby. Another large dust storm is spilling out of the giant Hellas impact basin in the Southern Hemisphere (lower right).
.jpg)
(c) NASA/JPL/UA, CC BY-SA 2.0
Minerals that form in water have been detected in the cliffs of the Aram Chaos region of Mars, suggesting these rocks may have formed in an ancient lake
Sent by: Mars Reconnaissance Orbiter | From: Mars | Credit: NASA/JPL/UA
Added to www.ridingwithrobots.org June 23, 2008.
Blocks in Aram, as seen by themis at location 2.8 degrees north latitude and 21.1 degrees west longitude. Picture taken with Mars Odyssey's THEMIS. Photo credit NASA/JPL/ASU.
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image mosaic was constructed from data acquired by the MOC red wide angle camera. The large, circular feature in the upper left is Aram Chaos, an ancient impact crater filled with layered sedimentary rock that was later disrupted and eroded to form a blocky, "chaotic" appearance. To the southeast of Aram Chaos, in the lower right of this picture, is Iani Chaos. The light-toned patches amid the large blocks of Iani Chaos are known from higher-resolution MOC images to be layered, sedimentary rock outcrops. The picture center is near 0.5°N, 20°W. Sunlight illuminates the scene from the left/upper left.
Badlands of Aram Chaos This observation shows erosional features on light-toned rocks in Aram Chaos, a crater near the equator of Mars that has been nearly filled with sedimentary rocks. In enhanced color, the sediments are very distinctive. The rocks show a sharp change in color partway down the slope, indicating a change in the properties of the rock, probably to a different composition.
The erosional features have alcoves with aprons downslope, and in some cases have hints of channels, potentially due to abrasion by falling debris. These morphologies bear some resemblance to gullies commonly found in the mid-latitudes, which are often thought to have formed due to erosion by liquid water from melting snow. Near the equator, however, snowmelt in Mars' recent climate is less likely.
Eastern Floor of Aram Chaos