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Message from discussion New pictures of enceladus
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George  
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 More options Apr 9 2008, 3:38 am
Newsgroups: sci.geo.geology
From: "George" <Geo...@george.net>
Date: Tue, 8 Apr 2008 13:38:46 -0400
Local: Wed, Apr 9 2008 3:38 am
Subject: Re: New pictures of enceladus
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"Florian" <auxotectonics_deletethis@nachon_andthis.net> wrote in message

news:1if2mga.oacams7yayo0N%auxotectonics_deletethis@nachon_andthis.net...

> George <Geo...@george.net> wrote:

>> Umm, your words, Floppy:

>> "Sounds like you deny the existence of ridges extruding ice".

> That must be why everybody use the expression "spreading ridges".

> Anyway. Let's check your brand new position on the matter.

> Do you agree that there is ice extruded by rifts (to make you more
> confortable) on Enceladus? Do you understand that this ice is fresh
> because it is crystalline? So where is that ice going?

> --
> Florian

No.The ice isn't extruded BY rifts.  The ice is extruded AT the
rifts/fracture zones.  Since we know almost nothing about the tectonic
system at Enceladus, it would be premature to make a definitive statement
about why the ice extrudes AT the rifts.  But we can look at what we know
about physics and tectonic systems overall and make some generalizations.
For instance, given the nature of the extrusions there, in the form of ice
geyser activity, and given the presence of hotspots along the tiger stripes,
it is a pretty good bet that hotspot ice volcanism (yes, I realize that term
may appear to be an oxymoron) is involved.  You claimed that the ridges are
extruding ice, which is an inaccurate statement.  The ridges aren't
extruding anything.  Neither are the rifts.  The ice is extruding AT the
rifts.  The rifts aren't doing the extruding.  The rifts likely exist
BECAUSE of the extruding ice, and the ice is likely extruding because of the
presence of hotspots.  That was my point.

George


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