"Carsten Troelsgaard" wrote in message k...
"sean" skrev i en meddelelse
om...

snip

Doesnt solder tend to bead up on flux? Maybe there is a comparison
there. Or as the martian atmosphere is different then here on earth
maybe certain chemical reactions from heat-caused situations like
crater exposions from incoming particles rocks etc would cause some of
the elements melted in the explosion to `bead up` on the colder
martian surface in a different atmosphere? Then wind distribution
withsand could give it the mix as an earlier post suggests above.
Sean

I don't know - it could, I guess. My current problem is, that the outcrop
judge by structure, is laid out in water: 1) the precipitation (being it
biogen or not, of some sulfate-compound) in water would be very Earth-like ,
2) The lowangle bedding with onlap is an inherent fluid-structure but could
be interpretated from wind-action. 3) The 'fused' or diagenetic appearance
as an outcrop is very 'wet' and Earth-like. 4) Some of the spheres seems
very fragile as probably could be expected for precipitations (gypsum
CaSO4*2H2O wither to waterfree, possibly powdery anhydrite).
I consider the biogen origin a possibility, but ascribe it to express but a
subtle or vague 'livelihood' that may tilt a geochemical balance that under
'almost any circumstance' will be calculated from spontaneous geochemical
equilibriums. Unfortunately we will probably not be exposed to very detailed
mineralogical data, so our speculations will stay speculations. - Looking at
an essentially dry Mars and argue 'wet' leaves a lot to be desired.

Not all observations of spheres conforms well to this 'wet' origin. Some
backbone-geology on what traces flowing water and an accompanying
hydrosphere would leave doesn't fit the picture. - So has Earth-bound
geology come to a halt? Looking at the Mars-desert that could be any desert
on Earth: No .... But most geological Earth-constants does not apply. What
consequences for surface-geology follow from a crust that does not move
continents around and does not renew itself and no longer disappears into
the deep? That could very well make a lot of difference, along with all the
other factors - especially including the perspective that these
Earth-different processes has worked for a long time.... but that's obvious

The 'stabile' crust may after all also make some of the geology easier.
Things are where they always have been: eroded sediments are put into the
holes, - and stay there. A deep sea or lake does not stay deep for a very
long time. And no orogens re-expose the sediment. What would this mean for
the traces we expect to be left by water?
The large-scale morphologic traces of water all conforms to one thing: There
is an overwhelmingly lot more sediment to be carried, than water to carry
it. - maybe a natural consequence of a retreating hydrosphere.

I wish that I right away could account for the wave-climate in a shallow
lake under the given circumstances, but I cannot - but I have reason not to
expect a very choppy and energetic seasurf. If the sediment-sink is off and
'too much' is standard, - what would be the consequence? Evaporites, but
also heterolites, that is an inter-layering of sand and clay - or straight
out laminated strata. Such an occurrence - and that's not much to ask -
could definitely point to a 'wet' origin.

If a hydrosphere 'on the edge' has been a standard, and a shower an ultimate
climatic anomaly - then I could see the raindrops in turbulence aggregate
dust to form spherulites - or raindrops preferentially nucleate around
dust-particles.

Carsten


I am an interested amateur only, so some of your terminology terms
elude me here. But your post is interesting an informative
thanks.Regarding your last idea of raindrops maybe from a severe and
infrequent storm rather than persistent earth like rainfall ? Although
one problem I thought was if it was rainfall it would have to be a
warm environment and the current climate is way to cold for a liquid
water to fall as rain. Anyways ifthe climate was warm enough and if
the nodules are composed of a material that fuses like a fast drying
cement one could possibly recreate soemthing similar here in a lab. Is
there a gas that liquifies at the present mars temp that could fall as
rain to replace the water part of this precipitate theory?

Otherwise in a dry scenario If the nodules are on the surface maybe
they were created more recently rather than be sediments from wind
action that have since been disturbed. Going back to the explosion
idea I suggested before,..
I dont know if there are enough craters to allow the statistical
chance of finding these all over Mars and at the lander site but I was
thinking a bit more on maybe how they were created, if by an impact
crater event.
If lets say at impact either water or another gas either present as
liquid or solid in the projectile or in the sediment ,were to be
instantly heated to extreme high tempratures. The material that the
nodules is made of could also mix in that instance with that breif
extremely hot gas cloud above the explosion site sort of like a soupy
particulate mix of gas and liquid droplets mixed with the nodule
element. As it is forced out and away from the site at great speeds by
the explosion the mixture is cooled rapidly as it spreads out into
the presumabley extreme cold of the martian atmosphere. This would
cause the cloud to precipitate out in a sense into droplets , all
small , and very rapidly `freeze` into shape in seconds as they are
speeding through the extreme sub zero martian atmosphere and then
presumably are hard all consistently sized small frozen droplets when
they land around the impact site. They then over time `freeze dry`
out the liquid water (or whatever liquid it is) in the sun and climate
to the present state of a nodule consisting of just the original
material which could have initialy pre impact have been a powder or
granular material like glass once was sand?
One idea would be to look for similar phenomena at old nuclear test
sites as in essense I am suggesting they a sandy or powdery medium
mixed in with a liquid and as baked `nodules in extreme rapid heating
, cooling and speeding `event` through a cold atmosphere to get the
small sized droplet shape. Maybe the thinner matian atmospher would
aerodynamically produce a rounder projectile rather than the heavier
earth atmosphere which would have elongated the droplets .As I
mentioned this phenomena may also occur similarly at nuclear test
sites.
They then erode by wind into the observed sandy mixture
Sean