YellowKnife Bay - Page 22

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hortonheardawho


Posts: 3465

Reply: 421



PostPosted: May 26, 2013 11:11 AM 

Sol 0283 MAHLI 3D of drill dust on Cumberland rock:

It always pays to look in 3D if you can.

Try cruising this 3D at 200% using StereoPhoto Maker - the best free 3D viewer in the known universe.

Some of the curious straight lines turn out to be edges of small thin flat chips of material. Where did those come from? How did they survive the drilling process?

Er, is anyone else surprised how deep the LASER blasted holes are? I wonder how deep a thousand zaps could get? Deeper than the drill?

And again, SOD be everywhere.

hortonheardawho


Posts: 3465

Reply: 422



PostPosted: May 26, 2013 12:49 PM 

Sol 0283 enhanced difference false color panorama near Cumberland rock:

Haven't done one of these in a while.

Notice the "greenest" areas are patches of "bumpy" rocks. I have no idea what this means - but I believe that there is something "different" about these areas.

Here's hoping ( raising a glass ) that the "bumpy" area of Cumberland just sampled has some interesting chemical results.

hortonheardawho


Posts: 3465

Reply: 423



PostPosted: May 26, 2013 2:02 PM 

Sol 0285 Chemcam view of rock in Yellowknife Bay:

This and other Chemcam targets on this sol do not look nearby and have no "after zap" pictures.

This animation looks like a focus zoom on quite distant rocks:

Is this preparation for night time Chemcam operations? If not, then WHY can't the LASER be used on distant targets at night? Just curious.

Mark Wilson


Posts: xxx

Reply: 424



PostPosted: May 27, 2013 8:21 AM 

I really hope we move soon - even though there are some sites here that they still want to take a closer look at.. The one site I would like to get a better look at is "Hotta"

I think it's now pretty unlikely we are going to get to Mt Sharp before the end of the primary mission.

Mizar


Posts: 692

Reply: 425



PostPosted: May 27, 2013 11:08 AM 

Reply 423
The same rule on Mars as on Earth: Don't aim a gun to a distant target without to be sure you don't kill something...

LWS


Posts: 3062

Reply: 426



PostPosted: May 27, 2013 11:13 PM 

Mizar; Some very interesting images in the sol 286 Navcam thumbs. Too small to distinguish features but they look like some weird rocks but might possibly be related to the rover itself.

Winston

hortonheardawho


Posts: 3465

Reply: 427



PostPosted: May 28, 2013 12:31 AM 

Sol 0283 0274 3D Mastcam / Chemcam 3D enhanced difference false color of peculiar rock:

with location links.

These peculiar bumpy "green" rocks are of intense interest right now.

We will know what all the "green" is about "soon"...

MPJ


Posts: 250

Reply: 428



PostPosted: May 28, 2013 4:10 AM 

re427, I hope so too! For me them pale blue/green "bubble mats" is among the most interesting features of YkB and the most apparent as well due to its abundant appearances (nobody can miss them without total ignorance).

I stand by for chemical results of the latest drill - they seem to have drilled right into one occurrence of it this time. Yet I would say this is a rather superficial feature and may be better sorted out with detailed accompanying ChemCam data(!) which they seem to have collected as well meanwhile.

Kevin


Posts: xxx

Reply: 429



PostPosted: May 29, 2013 11:03 AM 

Interesting it does not seem to drop below 8.5 mb so water should remain in liquid state if any decided to pop up to the surface!

?st=cFM5fHRXQ6bR6ySeuJ9_kg&e=1369842050

MPJ


Posts: 250

Reply: 430



PostPosted: May 30, 2013 4:58 AM 

While waiting for "hard" chemical data here is another peculiarity of Martian "just rock" shapes.

Sol 273 MR:

Source:

Chance has it, Mars (Gale crater) continues to appears like a big paleontological museum. Very Happy

hortonheardawho


Posts: 3465

Reply: 431



PostPosted: May 31, 2013 3:23 PM 

Sol 0288 0290 Chemcam panorama of Cumberland rock:

with Laser Zap animation links.


Er, can anyone ( I'm looking at you Barsoomer ) locate this interesting area in a right Mastcam view?

It is difficult to see exactly what the Laser blast is doing without a close 3D view.

Some of the nearby areas darken - others lighten?

hortonheardawho


Posts: 3465

Reply: 432



PostPosted: June 1, 2013 2:55 PM 

Sol 0290 enhanced difference false color detail of "spaghetti network" on bumpy green rock:

with location link.

Just how stringy does a "fracture fill"have to be before it is no longer a fracture fill?

Sure wish that there were some "rock guys" around who were willing to discuss these features.

On a totally different, note does anyone have a clue about the 1000+ frame grossly overexposed movie made on sol 289?


Also, some of the frames look a lot like a new Bayer format for readout of the CCD.

lookin@mars


Posts: xxx

Reply: 433



PostPosted: June 2, 2013 12:44 AM 

Very Strange Lookin.

as for: "does anyone have a clue about the 1000+ frame grossly overexposed movie made on sol 289?"

Just this from the other blog "Unfortunately there is no public information I can point you to about all the video modes and options; this information will be in the PDS release which by the schedule should occur next month."

*** I fixed your Flickr posting. HHAH.

newboy


Posts: 1

Reply: 434



PostPosted: June 2, 2013 5:21 AM 

Hort, re your 432

It's fracture fill, but if you imagine the fracture fill material increasing so that it is more than say 50% , then it is a breccia.

There can be a continuum between the two states.

Still here regularly, mostly to enjoy your images (and others from your imagery class). Unfortunately don't have time to engage in defense of boring 'rock guy' arguments, as mostly they are ignored.

MPJ


Posts: 250

Reply: 435



PostPosted: June 2, 2013 7:51 AM 

Fair enough newboy but what is your take on those bumpy textures on certain rocks which I call blue/green bubble mats? Smile

Example (there are lots in Hortons collection as well):

or lots of zoom possibilities here: http://gigapan.com/gigapans/126968

After "exploring" this kinds of panos at maximum resolution, a certain relationship of those mats or coatings with bubbles/concretions(?) and the gypsum(?) veins or fracture fills becomes apparent. Is there a straight forward geologic explanation - maybe similar examples in Earth geology?

newboy


Posts: 1

Reply: 436



PostPosted: June 2, 2013 10:38 AM 

MPJ re 435:

The 'bumps' occur throughout the rock and not just as a surface coating nor sitting on discrete planes which were formerly surfaces in the sediments. In other words, they are an integral part of the rock composition and not mats. You can also see they weather out as discrete spheres, some lying around the rock outcrops, just like the blueberries of Opportunity images.

Re your question on a relationship between veined rock and the concretions, all we can say for now is, not necessarily. When we have seen other rock units different from these and look at the vein density, there might be a relationship. For example, these rocks may have had have a higher level of calcium sulphate so end up with a higher density of gypsum veins. The concretions (I haven't seen anything on their composition) may also be due to the high initial sulphate composition in the original sediment. However there could be many reasons still to be figured out.

What are they? Most likely some kind of concretion.

We did see some 'bubble' features earlier, I can't remember where. There it looked like de-gassing of sediment, with a shape like a micro-volcano. For an example of degassing, look at the sand on a beach just at the wash line. As a wave retreats, bubbles of air trapped in the water-saturated sand burst up on the surface, leaving little holes with concave sides.

lookin@Mars


Posts: xxx

Reply: 437



PostPosted: June 2, 2013 11:00 AM 

Thanks for your posts Newboy, it is nice to see two (or more) sides of what we are lookin at on Mars. Because at this point it is all just theories.

re 433 Thanks Hort! Very Happy

MPJ


Posts: 250

Reply: 438



PostPosted: June 2, 2013 4:59 PM 

newboy, I somewhat doubt that this "bumps" appears throughout the rocks as where is no photographic evidence of it (yet?). Any broken pieces imaged to date don't include "inner" concretions. As of yet I think its a superficial feature therefore some kind of rind/coating with those bumps/bubbles/concretions develope on its surface - sometimes even wrapping around rock sides.

As sad earlier here an elegant explanation (..and my favorite to date) could be some kind of microbial mats with those bumps being manifestations of bubbled up respiratory gases of bacteria colonies beneath (eg chemoautrophic microbes - methanogens perhaps) during its active times which would result in those small degassing features you describe as well.

In any case a detailed chemical analysis may shed some light on those features for sure but how much would fossil microbial induced sedimentation features differ from purely geologic sedimentation features in a SAM etc. analysis...

hortonheardawho


Posts: 3465

Reply: 439



PostPosted: June 3, 2013 12:42 PM 

Sol 0291 MAHLI animation of brush of Cumberland rock:

You must view the original size to see the animation.

LWS


Posts: xxx

Reply: 440



PostPosted: June 3, 2013 6:52 PM 

Hort;

Nice gif as usual. Noted the surface cracks with nary a white vein (gypsum?) growth in them as contrasted with the nearby white surficial veins. Very interesting!

Winston

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