YellowKnife Bay - Page 15

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MPJ


Posts: 250

Reply: 281



PostPosted: March 22, 2013 8:21 AM 

At last some results which I was hoping for regarding ChemCam:
"Los Alamos science sleuth on the trail of a Martian mystery"
[link]

Therefore, if the first blast is dusting off the rocks, the remaining four blasts could be showing that Martian rocks are coated by a substance, similar in structure if not composition, to the dark rock varnish appearing on Earth rocks in arid locations like the desert Southwest.

"The thing about rock varnishes is the mechanism behind why they form is not clearly understood," Lanza said. "Some people believe that rock varnish results from an interaction of small amounts of water from humidity in the air with the surface of rocks-a chemical reaction that forms a coating. Others think there could be a biological component to the formation of rock varnishes, such as bacteria or fungi that interact with dust on the rocks and excrete varnish components onto the surface."

So they picked up some changes in composition while "lasering" down into the rocks? Smile
I wonder if that "5-shot mystery" is also apparent on the "bubble mats" of YkB...

newboy


Posts: 1

Reply: 282



PostPosted: March 22, 2013 11:22 AM 

A very nice up to date summary of the geological thinking from both rovers.

[link]

LWS


Posts: 3062

Reply: 283



PostPosted: March 22, 2013 2:17 PM 

MPJ;

Nice find. Looks like a distinct possibility that Lanza has found the ubiquitous rock varnish.

Nice!

Winston

MPJ


Posts: 250

Reply: 284



PostPosted: March 22, 2013 3:32 PM 

Winston, the dark rock varnish she mentioned would be the manganese enriched type which is strongly suspected to be biogenic in contrast to the iron enriched variants on Earth! On Earth this type too tends to be highly shiny like many observations suggest in Gale crater as well. Manganese - as I probably mentioned in earlier remarks - is a strong UV protector for microbial communities. Smile

Barsoomer


Posts: 344

Reply: 285



PostPosted: March 22, 2013 8:59 PM 

http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1785.pdf

Not from Lanza but about varnish coatings.

hortonheardawho


Posts: 3465

Reply: 286



PostPosted: March 23, 2013 11:32 AM 

sol 0200-0223 Right Front Hazcam animation:

Frost in cracks???

LWS


Posts: 3062

Reply: 287



PostPosted: March 23, 2013 1:40 PM 

Hort;

Nope. Frost that was and is and continues to be in cracks and developing into typical gypsum veins NOW! Not a few billion years ago. That is how the gypsum forms in the way it does on Mars.

Winston

Barsoomer


Posts: 344

Reply: 288



PostPosted: March 24, 2013 10:26 PM 

[link]

Another "Curious Mars" article.

hortonheardawho


Posts: 3465

Reply: 289



PostPosted: March 25, 2013 11:58 AM 

Sol 0098 - 0224 animation of rover deck near fiducial mark in Gale crater, Mars.

Note that the stuff holding the fiducial onto the deck is curling up and peeling away.I wonder how long before it falls off?

Also note that the stone in the upper left has not moved - and has darkened. What's holding it in place when all the other stones have moved? Is the darkening a lighting effect?

Barsoomer


Posts: 344

Reply: 290



PostPosted: March 25, 2013 11:53 PM 

Could the darkening be due to the stone getting dirty? There seems to be considerable deposition of dark material between the two sols.

On another topic:

[link]

Interview with John Grotzinger.

hortonheardawho


Posts: 3465

Reply: 291



PostPosted: March 26, 2013 2:16 PM 

Sol 0226 chemcam panorama of flaky rock:

The chemcam has returned to this curious area repeatedly.

And here are more curious veins associated with rock caves:

Sol 0192 3D of branching mineral veins:

newboy


Posts: 1

Reply: 292



PostPosted: March 26, 2013 4:33 PM 

Hort,

This image

looks like spheroids again, except much smaller. Can you find images to make a stereo? They also look like those 'burst bubbles' we saw earlier but the way they weather suggest they are spherical.

hortonheardawho


Posts: 3465

Reply: 293



PostPosted: March 26, 2013 8:04 PM 

Sol 0200 0215 animation of mineral vein uncovered by the wind:

My best guess now is that dust covering the white veins in the cracks was blown away between sol 0200 and sol 0215 and thus the white material is not frost.

newboy, if you can find a Right Mastcam view of a chemcam area then I can produce a 3D. It will be close ( less than seven meters ) to the rover.

MPJ


Posts: 250

Reply: 294



PostPosted: March 27, 2013 4:52 AM 

newboy, re292: Iam still waiting for an "official" take on that rather tiny features. They have been "lasered" a couple of times meanwhile - mostly near misses but certainly some direct hits on this little bubbles/pimples too. I would wish for them not being interpreted as stand alone features but strongly related to a (pale blue/green-) wrapping/covering of specific(?) rock/bedrock types with those white veins and other more root like features nearby. On the bedrock with bubbles that covering is hardly seen trough the dust but on more dust-free rock edges its really obvious.

My exemplary prime example still this (near filed sol192):

http://gigapan.com/gigapans/124324/snapshots/320434

hortonheardawho


Posts: 3465

Reply: 295



PostPosted: March 27, 2013 9:58 AM 

Sol 0194 0226 Bayer processed animation of changes to soil around broken rocks:

Lots of wind and slump changes.

I wonder when the original Bayer mastcam images will be posted to the Analyst's Notebook?

And here are changes to one of the drill holes:

kevin


Posts: xxx

Reply: 296



PostPosted: March 27, 2013 11:47 AM 

Thanks Hort there seems to be a bright vein like a lightening bolt going down the wall, calcium?

hortonheardawho


Posts: 3465

Reply: 297



PostPosted: March 27, 2013 12:55 PM 

Sol 0227 mastcam / chemcam 3D of drill hole:

Yes, there does seem to be some sort of vein in the hole. However, I can't see it in the sol 0182 MAHLI views of the hole - so I don't know if it is a "real" development since sol 0182 - or just an illusion. Hope they do another MAHLI sequence of the drill holes.

LWS


Posts: 3062

Reply: 298



PostPosted: March 27, 2013 7:50 PM 

Hort;

I'm with you re. that hope that they will do another MAHLI sequence of the drill holes. But if they do they will be breaking with the tradition set by the MER handlers who never followed up on situations like this that involved changes in RAT holes that were adduced to have been caused by wind movements.

The veins don't seem to be there in the sol 182 MAHLI views of the hole. They are there in the subsequent views. There was apparently no further drilling of the hole after sol 182. So the only rational presumption is that either the veins resulted from wind funnelling around in the hole and removing the dirt from around the vein or the vein somehow developed (grew) from the inner hole surface. i.e. a similar situation to the one you showed at the surface with the exposure / development of the veins in replies 286 and 293 above.

Bet they won't explore this one any further. But it would be so simple. Do some further holes in the area and use all the instruments to closely record all the changes over a 5 day or so period. Then tell us if wind or "growth" is the likely factor.

Winston

MPJ


Posts: 250

Reply: 299



PostPosted: March 28, 2013 4:15 AM 

One thing which really bothers me is the lack of night-time observations using the visual/uv illumination capabilities of the MAHLI system. The drill-hole and brocken off rocks would (have been)a really interesting application of MAHLI capabilities. Imagine having a swiss army knife only to use it to butter bread... Confused

kevin


Posts: xxx

Reply: 300



PostPosted: March 28, 2013 5:27 AM 

Composition of 227:

[link]

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