Water on Mars - Page 13

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Barsoomer


Posts: 344

Reply: 241



PostPosted: May 25, 2012 12:39 AM 

link

Acidic icy weathering proposed for Valles Marineris and Mars in general.

Ben


Posts: 2270

Reply: 242



PostPosted: May 25, 2012 11:47 AM 

Barsoomer; A good explanation why ground water upwelling has not formed the widespread sulphate layers on Mars.

Barsoomer


Posts: 344

Reply: 243



PostPosted: May 25, 2012 3:59 PM 

Yeah, the proposed "Phyllosian" may have been an Ice Age. However, I think ground water upwelling would still be needed to explain the gypsum veins at Endeavour, which are thought to be related to the sulfate (American spelling) layers at Meridiani.

John Henry Dough


Posts: xxx

Reply: 244



PostPosted: May 25, 2012 4:04 PM 

http://geology.gsapubs.org/content/early/2012/03/23/G32971.1.abstract

Fascinating stuff.
j.

Barsoomer


Posts: 344

Reply: 245



PostPosted: May 30, 2012 11:56 AM 

[link]

Proposes that a 200 MYr warm wet period on Mars may have been caused by long-lasting effects of major impacts.

Paper in Icarus journal:

An impact-induced, stable, runaway climate on Mars

Teresa L. Segura, Christopher P. McKay, Owen B. Toon


John Henry Dough


Posts: xxx

Reply: 246



PostPosted: May 30, 2012 11:12 PM 

Yes they make a very good case for it and it sounds to me as plausible as any other,,,

[link]

Here I tried to post a link that speaks again of carbon.
Our life is described as carbon based,,,,,I don't know it it is my imagination but it seems more and more carbon articles are popping up.

Barsoomer


Posts: 344

Reply: 247



PostPosted: June 8, 2012 4:22 PM 

[link]

Periodic climate fluctuations.

LWS


Posts: 3062

Reply: 248



PostPosted: June 13, 2012 7:48 AM 

Barsoomer / MPJ; I need some help here. I've been trying to locate a recent paper that described a spectrographic analysis by pancam and apxs of changes in the spectra of salts released to the surface by spirit in columbia hills using a band in the spectra that was concluded as indicating water and whose amplitude was correlated with the amount of water held loosely in or on the salts.

As far as I recall, the paper concluded that the analysis indicated that water was released from some hydrated iron salts over a few days or hours when they were exposed to the atmosphere. This might be taken to mean that the water on some of these salt species might be loosely bound and possibly available to putative microbes below the surface.

It was a very big deal.

But I can't find the paper anywhere.

Anyone, Please help if you can.

Winston

hortonheardawho


Posts: 3465

Reply: 249



PostPosted: June 13, 2012 8:18 AM 

Winston perhaps the droids you are looking for are here among the 284 cited references.

LWS


Posts: 3062

Reply: 250



PostPosted: June 13, 2012 8:55 AM 

Hort; Thanks! I'll check through the references.

and oops.

my email application indicated that the post above hadn't gone through so I pressed send again and then found that it had indeed done so.

Please delete the earlier post.

Winston

Barsoomer


Posts: 344

Reply: 251



PostPosted: June 14, 2012 12:02 AM 

http://www.lpi.usra.edu/meetings/lpsc2006/pdf/1673.pdf

Seasonal variation of bound water (BW).

http://adsabs.harvard.edu/abs/2011AGUFM.P22A..02R

Hydration signature.

http://meteorite.unm.edu/site_media/pdf/WateryPast.pdf

General Interest.

Barsoomer


Posts: 344

Reply: 252



PostPosted: June 14, 2012 12:37 AM 

http://sese.asu.edu/content/spring-2011-colloquium-abstracts-alian-wang

This may be closer to what Winston requested. Dehydration at Tyrone in Gusev after a salty area was exposed, suggesting potential habitability.

Barsoomer


Posts: 344

Reply: 253



PostPosted: June 14, 2012 12:57 AM 

Sorry for the multiple postings but I think these papers are more relevant to Winston's request and also more recent:

http://meteorites.wustl.edu/abstracts/lpsc43/a_l12l01.pdf

[link]

and a somewhat contrary view from MER team members:

[link]

hortonheardawho


Posts: 3465

Reply: 254



PostPosted: June 14, 2012 11:39 AM 

This HIRise GIF animation in Newton crater - from the article Seasonal flows on warm Martian slopes should settle the matter: There is liquid water on Mars - now. Period. Full Stop.

LWS


Posts: 3062

Reply: 255



PostPosted: June 14, 2012 4:20 PM 

Hort; I agree totally with your #254. However there are several who will only agree if and when they can personally taste the water.

Barsoomer; the links in your #253 came very close but the specific paper I think I saw is still elusive. I think it was from the 2012 LPSC papers however and that there was a discussion on MRB about it with Serpens using some abstruse geochemical logic about the removal of OH ions from ferricopatite to scuttle the argument. I think that I saw the paper around the time that I was looking for papers on VNIR spectroscopy on Mars and that one seemed to hit the nail on the head about the possibility of exposed salts releasing bound water and therefore the allied possibility that the water held by some of those ferrous salts might be available to putative microbes just below the surface.

Thanks very much for the papers linked above!

Perhaps I should explain what I'm doing. I'm putting together an html document on the MER imagery (Hazcam, Pancam and MI) that suggests that there might be water on the surface of mars and also the ones that, to me, seem to suggest signs of fossil or even extant life in the images.

I'm about 3 weeks or so from finishing the first draft and that paper would have been a fairly important link in the water story accompanying the images.

I think it might be a useful reference and, when I finish the first draft, I intend to post a pdf here for any comments.

I may have to request permission from you, Hort, Mann and perhaps dx, for including a few of your composites or 3Ds in the document.

Winston

hortonheardawho


Posts: 3465

Reply: 256



PostPosted: June 14, 2012 4:44 PM 

Winston, you may use any images that I have done with my blessing.

If the image is before sol 2790 and you want the best I can do then I will redo from the original data.

I look forward to your paper.

LWS


Posts: 3062

Reply: 257



PostPosted: June 14, 2012 6:53 PM 

Hort; Thanks very much. I'll try not to disappoint.

I'm thinking of the document as another phase of the MRB berry measurement contribution to knowledge. But this time a more "popular" rather than "science" type of presentation.

dx


Posts: 1661

Reply: 258



PostPosted: June 14, 2012 7:58 PM 

LWS...

Please use any image I have created and post on my flickr account and all the best with your paper.

Yt
dx

John Henry Dough


Posts: xxx

Reply: 259



PostPosted: June 25, 2012 12:18 PM 

Extensive Water in Mars Interior.

Barsoomer


Posts: 344

Reply: 260



PostPosted: June 29, 2012 11:11 AM 

[link]

Persistent underground water.

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