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Gully formation by dry debris?, Pelletier:"Recent bright gully deposits on Mars: Wet or dry flow?&
imipak
post Mar 1 2008, 05:18 PM
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New work (Pelletier, McEwen, Kolb and Kirk; 'Geology', March 2008) apparently suggests dry debris is a more likely candidate for producing gullies of the sort observed by HiRISE.

This seems to me a more naturally "Occam-friendly" explanation than convoluted scenarios involving frozen aquifers with ice plugs that burst from time to time. What do the experts make of it?


(Edit: sorry for the mangled topic title, BTW; I'd blame the software tools, but I know what that'd make me smile.gif )


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marsbug
post Aug 26 2008, 08:19 PM
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Personally ( and probably this is a bit weasel of me but even so..) I think conditions on mars have varied enough for both wet, damp, ever so slightly damp, and totally dry flows to have happened, although perhaps with a strong bias to the dry end of things. It just nags me that the issue keeps coming back up and being chewed over and none of us ever seem convinced enough by evidence one way or the other to reach a general consensus.


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Posts in this topic
- imipak   Gully formation by dry debris?   Mar 1 2008, 05:18 PM
- - nprev   Sounds plausible, but the trigger mechanism for su...   Mar 1 2008, 05:35 PM
- - JonClarke   QUOTE (imipak @ Mar 1 2008, 05:18 PM) New...   Mar 2 2008, 06:03 AM
|- - djellison   QUOTE (JonClarke @ Mar 2 2008, 06:03 AM) ...   Mar 2 2008, 08:33 AM
|- - JonClarke   QUOTE (djellison @ Mar 2 2008, 09:33 AM) ...   Mar 2 2008, 09:57 AM
- - djellison   So 'it looks like' then - and to be fair, ...   Mar 2 2008, 10:39 AM
|- - mcaplinger   QUOTE (djellison @ Mar 2 2008, 02:39 AM) ...   Mar 2 2008, 03:48 PM
|- - JonClarke   QUOTE (djellison @ Mar 2 2008, 10:39 AM) ...   Mar 2 2008, 09:07 PM
|- - djellison   QUOTE (JonClarke @ Mar 2 2008, 09:07 PM) ...   Mar 2 2008, 10:16 PM
|- - mcaplinger   QUOTE (djellison @ Mar 2 2008, 02:16 PM) ...   Mar 3 2008, 04:33 AM
|- - ElkGroveDan   QUOTE (mcaplinger @ Mar 2 2008, 08:33 PM)...   Mar 3 2008, 04:58 AM
- - nprev   If there is in fact water involved here; I would t...   Mar 3 2008, 02:57 AM
- - Stephen   Realistically, barring some serendipitious snapsho...   Mar 3 2008, 08:04 AM
- - dburt   QUOTE (imipak @ Mar 1 2008, 10:18 AM) New...   Mar 3 2008, 09:14 PM
|- - centsworth_II   QUOTE (dburt @ Mar 3 2008, 04:14 PM) Good...   Mar 4 2008, 07:41 AM
- - imipak   Thanks everyone, I thought there'd be some int...   Mar 4 2008, 11:36 AM
|- - jamescanvin   QUOTE (imipak @ Mar 4 2008, 11:36 AM) On ...   Mar 4 2008, 01:09 PM
||- - imipak   QUOTE (jamescanvin @ Mar 4 2008, 01:09 PM...   Mar 4 2008, 09:03 PM
|- - SickNick   QUOTE (imipak @ Mar 4 2008, 09:36 PM) Tha...   Jun 8 2008, 10:02 AM
- - Juramike   space.com article references recent PNAS article. ...   Aug 26 2008, 03:51 AM
- - marsbug   As important as the question of water on present d...   Aug 26 2008, 09:41 AM
|- - Juramike   (no offense taken...) I'm sure the pendulum o...   Aug 26 2008, 12:10 PM
|- - stevesliva   QUOTE (Juramike @ Aug 26 2008, 08:10 AM) ...   Aug 26 2008, 05:23 PM
- - marsbug   Personally ( and probably this is a bit weasel of ...   Aug 26 2008, 08:19 PM
- - Juramike   Head et al. PNAS (2008) Early edition (August 25, ...   Aug 26 2008, 09:58 PM

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