Crossing the Dunes at Murray Buttes, Sites 54-62, Sols 1353-1659, May 28 2016-Apr 6 2017 |
Crossing the Dunes at Murray Buttes, Sites 54-62, Sols 1353-1659, May 28 2016-Apr 6 2017 |
Jan 3 2017, 02:08 PM
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#841
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Member Group: Members Posts: 684 Joined: 24-July 15 Member No.: 7619 |
we also appear to have a thin layer of material over the veins. Hopefully someone can enlighten me on how this may have occurred The "thin layer" strongly resembles reflections from crystal faces in the veins that have been polished by the wind. If you ever walk along a crushed shale road or driveway at dawn, you see a similar glint from the crystal faces of shale layers and any inclusions. The general "sheen" you see on the mudstone polygons is consistent with "pipestone" fine grained, slightly metamorphosed mudstone/argillite aka (clays, silica, alumina-silicates) aka Catlinite. It polishes up to a nice glossy finish, you see it in carved stone art from Maori, Haida and US plains Indians. Generally found as lenses and defined layers within large mudstone outcrops. |
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Jan 3 2017, 09:02 PM
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#842
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Member Group: Members Posts: 384 Joined: 4-January 07 Member No.: 1555 |
To avoid confusion: Are you talking about grains like these? (rotated 90 degrees to reduce risk of optical illusion)... If so, those don't look like embedded to me, and may be wind-transported. Could be e.g. olivine, glass, impactite, or SiO2. We've seen (likely) olivine grains before in the dunes. Are there obviously embedded well-rounded bright translucent grains, hence evidently clasts or concretions of the rock? I agree, the ones you show appear to be sitting on or protruding from the rock, and where translucent and greenish, could be wind-transported olivine grains. For embedded, I was thinking of some of the less obvious ones, mainly in the shadowed region, that seem to fade into the rock, depending on how deeply embedded or small they are. If not spherules or mineral clasts, these could be some form of light-colored concretion. Still greater resolution would be nice, in this regard. dburt |
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Jan 4 2017, 02:11 AM
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#843
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
Crop of the 1526-52 rlb series. This shows more travelling ripples and how the wheel track and debris from a moved rock are erased and overrun by the ripples: [attachment=40603:1526_52_rlb.gif] Wow!! what have perhaps inadvertently become time lapse frames in Fredk's hands provide a rare and really quite astonishing glimpse into how the airflow and sand movement is actually behaving! .. now if they could purposefully set up some sequences like this using mastcam pairs, i suspect the result could be quite instructive.. also throwing in an unrelated color crosseye of the mudcrackers from sol1566. |
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Jan 4 2017, 09:44 AM
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#844
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Senior Member Group: Members Posts: 2428 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
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Jan 4 2017, 10:45 AM
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#845
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
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Jan 4 2017, 11:03 AM
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#846
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Senior Member Group: Members Posts: 2428 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
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Jan 4 2017, 12:47 PM
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#847
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
Thanks Paul, very little to improve on PDS images...
Here is another view of the approach, this time stitching two image sequences together... Sol 1384 ML 002 Minor foreground patches. -------------------- |
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Jan 4 2017, 03:55 PM
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#848
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Member Group: Members Posts: 684 Joined: 24-July 15 Member No.: 7619 |
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Jan 5 2017, 12:16 AM
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#849
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
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Jan 5 2017, 01:33 PM
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#850
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Senior Member Group: Members Posts: 2428 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
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Jan 6 2017, 03:43 PM
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#851
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Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
Stunning Sean
Best wishes for 2017, and I'm starting with some routine Navcam pan taken on Sol 1571 : -------------------- |
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Jan 6 2017, 05:38 PM
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#852
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Solar System Cartographer Group: Members Posts: 10150 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 6 2017, 11:51 PM
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#853
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Member Group: Members Posts: 866 Joined: 15-March 05 From: Santa Cruz, CA Member No.: 196 |
this sol1571 image stands out, looks as if the dust is pushed out from the central area, it looks as if it has received laser hits that cold be responsible for this.. the same area is covered pre-laser in this sol1570 Mahli at lower right, rotated a bit.
Nice closeup of other laser damage in this sol1570 shot Here is a beautifully exposed sol1570 MAHLI of the previously mentioned rmi target Also, this sol1570 MAHLI shows at near top what looks to be a somewhat significant crystal complete with facets? ..or a reflection/refraction trick? if only this image showed a bit higher up it would serve as a closeup. fwiw i made a crosseye of the pair retaining the 'crystal' in the left image. edit: found another pair from sol1569 that doesn't have much parallax but it shows up in both, here's a stereo excerpt. |
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Jan 8 2017, 03:51 PM
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#854
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Senior Member Group: Members Posts: 2819 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Jan 8 2017, 11:19 PM
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#855
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
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