Victoria Annulus, Discusions about Victoria's Apron |
Victoria Annulus, Discusions about Victoria's Apron |
Aug 9 2006, 01:41 AM
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
From today, Oppy will start to head toward the Victoria Crater which is about 500 meters away. The drive would take about one month (that is 15 soles of driven with an average of 33 meters/sol, the other 15 soles would be for other purposes or restrictive soles).
The surface around Victoria Annulus, I seems it won't be as smooth as the way between Eagle and Endurance craters but the surface would have no uniform or parallel wave of sand and dust in small size of ripple. See Phil's Victoria Annulus partial map, Tesheiner's one Victoria Crater picture Otherwise, the surface might have ripples smaller and alike to the ones of El Dorado, on the skirt south side of Columbia Hill. Besides, the Anuulus has no outcrops except to around of few small mini-craters. This is a change of morphology of surface around the Victoria Annulus. What does it explain about this developing kind of surface of sand? Its extension is just around the inside of Victoria's ray of ejection. That is coincidence. Around that has no bigger ripples as the outside of Annulus. The explanation would be that around annulus has smoother rock or outcrop surface, no blocks which had not helped to build ripples by the winds. Other factor, I am not sure, is that the slope from the border of Annulus to crater is positive (going up by few meters), then this might be another factor not to build ripples. I have seen that anywhere in the desert that have a slopes does not have any ripples but only flat surface. Any debate about why the Victoria Annulus does not look like ripples as the outside of Annulus. Rodolfo |
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Sep 5 2006, 06:28 AM
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
I keep wondering if the specific forms we see in the soil right now (the granule size ranges, the organization of the granules into three basic sizes and shapes, color and hardness) can tell us something about the conditions of the impact target at the time of the impact.
Does any of the soil material suggest that the impact target was wet or otherwised volatile-enriched? I'm assuming that at least some of the granules we see are pieces of impact melt, and I suspect the conical "drops" that some have labeled tecktitic are the most likely candidate for being impact melts. Does their shape and size, and the nearly ubiquitous hole in the center, suggest anything about volatiles content of the target? Or about its composition? Do we have to assume that their present shape and distribution is the result of erosional processes, or is there anything of their formation still evident in what we can see? Unfortunately, the three granule types seem so thoroughly mixed that it will be impossible for Oppy to get a good specific composition of just one of the types... so we'll have to infer composition of the various types from the aggregate Mossbauer and APXS readings we get from it. But I think that, if we could answer some questions about the constituents of this soil, we'd have some further insight into the chemical and climatic history of the region. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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