Scratch N Sniff The 'other' Rocks Time |
Scratch N Sniff The 'other' Rocks Time |
Aug 12 2005, 12:59 PM
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#1
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Member Group: Members Posts: 252 Joined: 27-April 05 Member No.: 365 |
http://marsrovers.jpl.nasa.gov/gallery/all...4P1131L0M1.HTML
I'm betting those dark crumbling rocks are the remnants of ejecta hurled from a crater (Victoria perhaps) made long after the lakebed dried up. |
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Aug 12 2005, 03:02 PM
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#2
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Senior Member Group: Members Posts: 1636 Joined: 9-May 05 From: Lima, Peru Member No.: 385 |
I think so. The outcrop stone and dark stone cannot be mixed. Let the IDD zoom on it in order to confirm.
Rodolfo |
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Guest_Myran_* |
Aug 12 2005, 03:28 PM
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#3
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Guests |
Im not so certain about that, Erberus do show dark patches too at the rim suggesting the dark material was there when the crater was created. And its one very old and eroded crater. So I keep an open mind about where these darker rocks/material originated.
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Aug 13 2005, 01:39 AM
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#4
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Senior Member Group: Members Posts: 2998 Joined: 30-October 04 Member No.: 105 |
There is no telling about the dark angular fragments at this point. We've been seeing them in increasing numbers the further south we drive and I think I'm starting to see larger pieces on the evaporite bedrock. We'll see what it is soon enough.
We need a marker horizon! --Bill -------------------- |
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Aug 13 2005, 04:59 AM
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#5
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
Finally, an MI. http://marsrovers.jpl.nasa.gov/gallery/all...4P2936M2M1.HTML
But it's hard to say much about it, other than it's fine grained and fractured. The ubiquitous Martian basalt? -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Aug 13 2005, 08:25 AM
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#6
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
Maybe these dark rocks are fragments of what lies beneath the evaporite layer? Erebus is the largest impact structure we've come close to, we ought to be traveling right now over the degraded remains of its ejecta blanket. The soft mostly-salt evaporite rocks that probably made up most of the ejecta blanket have weathered down to a flat plain, but if small, very shocked pieces of whatever underlied the evaporite layer were mixed in with the evaporite in the ejecta blanket, I would expect to see such chunks lying out on the ground, the softer evaporite having eroded away around it.
-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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Aug 15 2005, 12:36 PM
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#7
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Member Group: Members Posts: 252 Joined: 27-April 05 Member No.: 365 |
In his latest update, Steve Squyres says they have 2 principal theories - ejecta or meteors.
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Aug 16 2005, 12:51 PM
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#8
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Member Group: Members Posts: 252 Joined: 27-April 05 Member No.: 365 |
http://marsrovers.jpl.nasa.gov/gallery/all...D4P2957M2M1.JPG
I don't think the MI is going to make much out of this and the clump of rocks is likely too small to get an accurate reading on with the other instruments. Maybe they should 'stomp' on them with the rover and try to shatter some or at least scrape them off. |
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