IPB

Welcome Guest ( Log In | Register )

104 Pages V  « < 31 32 33 34 35 > »   
Reply to this topicStart new topic
Post Conjunction: Santa Maria to Cape York, The Journey to 'Spirit Point'
jamescanvin
post May 30 2011, 07:20 PM
Post #481


Senior Member
****

Group: Moderator
Posts: 2161
Joined: 9-February 04
From: UK
Member No.: 16



Skylab crater




--------------------
Go to the top of the page
 
+Quote Post
Guest_Sunspot_*
post May 30 2011, 07:44 PM
Post #482





Guests






What would these crystals look like if they were still in place in the rock?
Go to the top of the page
 
+Quote Post
jamescanvin
post May 30 2011, 07:46 PM
Post #483


Senior Member
****

Group: Moderator
Posts: 2161
Joined: 9-February 04
From: UK
Member No.: 16



QUOTE (Stu @ May 30 2011, 02:47 PM) *
Oh, very funny, chopping the tops of the hills off like that when we're all panting to make new colour pics of them...


I believe that is what is referred to on 'teh internets' as FAIL! wink.gif

Anyway, it's still worth stitching:




--------------------
Go to the top of the page
 
+Quote Post
Stu
post May 30 2011, 08:19 PM
Post #484


The Poet Dude
****

Group: Moderator
Posts: 5548
Joined: 15-March 04
From: Kendal, Cumbria, UK
Member No.: 60



3D view of Valdivia's funky textured ( © E Lakdawalla 2011 ) surface...

http://twitpic.com/54r38v/full


--------------------
Go to the top of the page
 
+Quote Post
centsworth_II
post May 30 2011, 08:45 PM
Post #485


Senior Member
****

Group: Members
Posts: 2030
Joined: 28-December 04
Member No.: 132



QUOTE (Sunspot @ May 30 2011, 02:44 PM) *
What would these crystals look like if they were still in place in the rock?

I have no idea if the missing crystals were gypsum,
but these crystals with matrix removed do
look like they would fit nicely into the Meridiani specimen
of matrix with crystals removed.
Attached Image

Gypsum, without associated rock matrix.
Size: 5 1/4" wide, 3 3/4" high, 3" thick.
http://www.minresco.com/special/spec3.htm
Go to the top of the page
 
+Quote Post
Guest_Sunspot_*
post May 30 2011, 08:50 PM
Post #486





Guests






mmm interesting.

I thought they might have looked sparkly and gem like blink.gif
Go to the top of the page
 
+Quote Post
centsworth_II
post May 30 2011, 09:40 PM
Post #487


Senior Member
****

Group: Members
Posts: 2030
Joined: 28-December 04
Member No.: 132



More examples of gypsum crystals that look like they would fit nicely into the Meridiani vugs.
Attached Image
Go to the top of the page
 
+Quote Post
ngunn
post May 30 2011, 10:07 PM
Post #488


Senior Member
****

Group: Members
Posts: 3093
Joined: 4-November 05
From: North Wales
Member No.: 542



That's very good centsworth. I don't know if it pins down the mineral because I don't know if there are other minerals that do similar things in sandy environments with who-knows-what chemistry, but I think you've highlighted a very plausible general explanation.
Go to the top of the page
 
+Quote Post
Stu
post May 30 2011, 10:17 PM
Post #489


The Poet Dude
****

Group: Moderator
Posts: 5548
Joined: 15-March 04
From: Kendal, Cumbria, UK
Member No.: 60



Can I just say how much I love this place? A picture gets posted, people look at it, suggest explanations and theories, hunt down pics of their own, post them, the discussion moves on...

biggrin.gif



--------------------
Go to the top of the page
 
+Quote Post
centsworth_II
post May 30 2011, 10:33 PM
Post #490


Senior Member
****

Group: Members
Posts: 2030
Joined: 28-December 04
Member No.: 132



An alternative hypothesis:
MERIDIANI PLANUM VUGS AS A CONSEQUENCE OF ICE CRYSTAL FORMATION FOLLOWED BY THAW AND DESICCATION
Attached Image

Go to the top of the page
 
+Quote Post
CosmicRocker
post May 31 2011, 06:04 AM
Post #491


Senior Member
****

Group: Members
Posts: 2215
Joined: 1-December 04
From: Marble Falls, Texas, USA
Member No.: 116



Every time I see these vugs I am struck by how similar they appear compared to the ice crystals in mud I often saw in the winter in the midwest. From what I have read, sulphate crystals seem to be the top contender for the formation of these vugs, though. By the way, there is a free electronic book about fossil ice crystals that contains some photos and sketches that look very much like the vug patterns in these rocks.

I can't help but wonder how the team targeted this outcrop. There is no way they could have seen the vugs from any distance, but it seems that they knew exactly what they were going for before Opportunity got there.

When we first saw these vugs I was hoping that the MIs would show them filled with some hydrated sulfate mineral. That would have been an interesting way to discover the polyhydrated sulfates that are supposed to appear as we approach Endeavour.


--------------------
...Tom
Go to the top of the page
 
+Quote Post
ElkGroveDan
post May 31 2011, 02:45 PM
Post #492


Senior Member
****

Group: Admin
Posts: 4657
Joined: 15-March 05
From: Sloughhouse, CA
Member No.: 197



As a former beach bum they remind me of seagull footprints in the sand.
Attached thumbnail(s)
Attached Image
 


--------------------
If Occam had heard my theory, things would be very different now.
Go to the top of the page
 
+Quote Post
djellison
post May 31 2011, 03:29 PM
Post #493


Administrator
****

Group: Chairman
Posts: 13702
Joined: 8-February 04
Member No.: 1



QUOTE (CosmicRocker @ May 30 2011, 10:04 PM) *
I can't help but wonder how the team targeted this outcrop.


Easy - use the last two drives before the Memorial Day weekend to arrive at the 'next' piece of outcrop. Stop. Do science for 3 days.

Go to the top of the page
 
+Quote Post
fredk
post May 31 2011, 06:59 PM
Post #494


Senior Member
****

Group: Members
Posts: 3112
Joined: 17-January 05
Member No.: 152



I'm guessing this means that all (or most) of the outcrops around here have similar vugs. I don't think they somehow honed in on the only one that had vugs.
Go to the top of the page
 
+Quote Post
jamescanvin
post May 31 2011, 07:45 PM
Post #495


Senior Member
****

Group: Moderator
Posts: 2161
Joined: 9-February 04
From: UK
Member No.: 16



Gumdrop Crater


James


--------------------
Go to the top of the page
 
+Quote Post

104 Pages V  « < 31 32 33 34 35 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 24th July 2014 - 12:16 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is a project of the Planetary Society and is funded by donations from visitors and members. Help keep this forum up and running by contributing here.