Exploration of Cape York - Vol 5 - Page 7

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Author Message
Barsoomer


Posts: 344

Reply: 121



PostPosted: November 29, 2012 11:12 AM 

Glossy. To my eye, the complex ridging looks dendritic.

John Henry Dough


Posts: xxx

Reply: 122



PostPosted: November 29, 2012 3:00 PM 

Glossy ,,yes.
Dendritic,,,,,I can't see that.

If indeed glossy and not a product of camera
or other unknown properties,,but if indeed glossy,,then what on Mars could allow/cause this?

Wind?
I don't see how.

Moisture?
We are told Mars is very dry.

Dew?
As in melting frost of an early morning sunrise? So what time of the day was picture taken?

Desert Varnish?
Taken from Wikipedia: Very Happy esert varnish forms only on physically stable rock surfaces that are no longer subject to frequent precipitation, fracturing or wind abrasion. The varnish is primarily composed of particles of clay along with iron and manganese oxides.[2] There is also a host of trace elements and almost always some organic matter. The colour of the varnish varies from shades of brown to black.[3]
----------OK then,,,but the above mentions clay and almost always some organic matter.
Sooooo,,glossy definition would get my vote as being Dew...but again this would depend on time of day of photograph.
John

hortonheardawho


Posts: xxx

Reply: 123



PostPosted: November 29, 2012 7:31 PM 

sol 3144 ( Nov 27, 2012 ) colorized MI pan of Sandcherry rock:

Looks whitish under the blue patina. Could be what Oppy has been looking for.

Wildcat


Posts: xxx

Reply: 124



PostPosted: November 30, 2012 2:36 AM 

It is benitoile.

John Henry Dough


Posts: xxx

Reply: 125



PostPosted: November 30, 2012 8:58 AM 

Yes,,,,Here we see at least two distinctly different minerals formed in the same rock.

If this rock is native to mars (and it looks to be) then here is our proof of ''long standing water''

How else could this rock have come to be
otherwise?
JD

Barsoomer


Posts: 344

Reply: 126



PostPosted: November 30, 2012 11:11 AM 

After grinding. The glossy blue layer seems to be quite thin, if I am interpreting the result correctly.

hortonheardawho


Posts: xxx

Reply: 127



PostPosted: November 30, 2012 3:02 PM 

sol 3137 ( Nov 29, 2012 )after RAT grind:

with 3D links.

Mizar


Posts: 692

Reply: 128



PostPosted: November 30, 2012 3:38 PM 

Horton's 3D link raised my eyebrows. Dotted lines, how?


newboy


Posts: 1

Reply: 129



PostPosted: November 30, 2012 6:52 PM 

Hi Kye, Re 101, 112 and 115:
I rushed to print - you're right, they are bedding planes that are weathering separately from the interbed material. Good observations.

I couldn't say what the nature of these beds are, other than flat laminar sediments, perhaps cyclical. I haven't done any homework so won't challenge you on your model, despite the fact that you prefer to invoke two rare events to explain them. Please don't take that badly, it's just there are many more boring explanations that might work and are therefore more likely.

Is that an unfair comment?

Barsoomer


Posts: 344

Reply: 130



PostPosted: November 30, 2012 9:13 PM 

There is an exciting explanation that might work too: microbial mats.

Kye Goodwin


Posts: 1166

Reply: 131



PostPosted: December 1, 2012 1:53 AM 

newboy, Re your 129, Wow. It is great to hear that we agree about something based on similar observations. This is much too rare an event. Thanks.

I'm not quite sure what the "mainstream" is saying lately about Cape York, but their initial explanation was that the bedrock of CY is an impact breccia created during the Endeavour impact event. We've seen a variety of outcrops subsequently that appear to differ significantly from the material at Odyssey Crater. This "jam and bread" material, being so uniformly fine-grained, seems especially to differ from the "breccia" at the south end, for example:

I think that the Athena team will have to invoke a few different processes to explain the variety of materials at Cape York. So far I see just one process and imagine just one event to explain all the bedrock of CY and the entire Meridiani traverse.

Sometime after the Borealis Impact created the Northern Lowlands and buried this region in it's ejecta, the Endeavour impact took place. Later, other big impacts created basins within the Borealis Basin, for example Chryse, Acidalia and Utopia. One of these, I'm guessing Acidalia because it's the nearest compared to diameter about 0.7 D away, covered this region in another thick layer of fluidized ejecta, filling Endeavour Crater and eroding it's rim. Looking at the asymmetrical remains of the rim, a surge from the NNW offers a good explanation of why the raised rim is missing mostly to the north, less to the south and still present to the east and west where the rim was the "thickest" obstacle across the direction of surge movement.

Cape York because of it's location and shape must be related to the rim of Endeavour Crater in some way. I think that the surge that filled the crater eroded the rim at Cape York to a level below the present surface. All the material we see is surge sediment, not earlier Endeavour rim material as expected. Somewhere not far below the present surface of Cape York there is a remaining obstacle of uneroded rim that interfered dynamically with the surge flow during the event much like a rock sticking up from the bottom of a stream. There is no "contact", no distinct boundary to Cape York because all the material we see on the Cape and surrounding the Cape was in motion together and has been mechanically blended together locally.

That's it. It's a really simple story that explains a lot. That big impacts buried this locale is close to uncontestable but no one wants to find that material. I think that impact is actually the LEAST INTERESTING explanation for anything on Mars and that's the real reason why its a tough sell.

Barsoomer


Posts: 344

Reply: 132



PostPosted: December 3, 2012 11:05 AM 

Upper right --- rock with an "X"-shaped hollow in it. If I was lottery-minded, I would go and take a look.

Barsoomer


Posts: 344

Reply: 133



PostPosted: December 3, 2012 11:10 AM 

Some small rocks that are very bright in the L7 filter (UV).

hortonheardawho


Posts: xxx

Reply: 134



PostPosted: December 4, 2012 9:27 AM 

sol 3128 ( Nov 11, 2012 ) infrared / visible enhanced difference false color of rock "Nippissing" in Oppy's track:

Glad this rock was looked at using all the filters. Maybe back up over it again and look again?

hortonheardawho


Posts: xxx

Reply: 135



PostPosted: December 5, 2012 8:22 AM 

Opportunity sol 3151 ( Dec 4, 2012 ) 3D infrared / visible enhanced difference false color after RAT grind of Sandcherry rock:

What I find fascinating is the "honey" ( bright yellow in both the infrared and visible ) on the toast and jam - lower left corner and a bit in the upper left .

It doesn't look like any of the surrounding rock.

Oppy has "bumped" a few cm to reposition the arm. Looks like there will be more IDD work so we will be here for a while.

Barsoomer


Posts: 344

Reply: 136



PostPosted: December 6, 2012 11:45 AM 

[link]

Monthly TPS review by A.J.Rayl.

hortonheardawho


Posts: xxx

Reply: 137



PostPosted: December 7, 2012 11:52 AM 

Opportunity sol 3153 ( Dec 6, 2012 ) 3D of peculiar area on "Copper Cliff" rock:

with location links.

Well. Oppy moved again towards a new science target.

There are some peculiar features on this rock - best seen in 3D.

Mizar


Posts: 692

Reply: 138



PostPosted: December 7, 2012 12:31 PM 

Ben said once something like that "look for repeating pattern to give us a clue to the surroundings". To me, this pattern is repeating, and in such a small area, this must be quite peculiar if this is isn't fossils of the same species...

Mizar


Posts: 692

Reply: 139



PostPosted: December 7, 2012 12:38 PM 

-- is before isn't was a typo --

hortonheardawho


Posts: xxx

Reply: 140



PostPosted: December 9, 2012 4:06 PM 

sol 3155 ( Dec 8, 2012) 3D closeup of more weirdness on Copper Cliff:

with location link.

Cruise the location link at 200% using StereoPhoto Maker to sample the weirdness.

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