[meteorite-list] Mars Odyssey THEMIS Images: October 4-8, 2010

[Jerry Flaherty]

Thank you Elton. I'll study on it.
Jerry

--------------------------------------------------
From: "MEM" <mstreman53 at yahoo.com>
Sent: Saturday, October 09, 2010 1:28 PM
To: "Jerry Flaherty" <grf2 at comcast.net>; "Meteorite Mailing List" 
<meteorite-list at meteoritecentral.com>
Subject: Re: [meteorite-list] Mars Odyssey THEMIS Images: October 4-8, 2010

> The term" rift valley/rift" is somewhat subjective as a rift proper is 
> normally
> associated with plate movement but this example in not from the "tectonic 
> plate
> movement" we are familiar with on earth. This valley resulted from a 
> "tectonic
> process". Specifically a branch of tectonic study called 
> thrust/contraction
> tectonics <http://en.wikipedia.org/wiki/Thrust_tectonics>
>
> The feature is a graben . A graben <http://en.wikipedia.org/wiki/Graben> 
> is type
> of fault feature where contraction( vs compression) pulls perpendicular to 
> to
> the linear features and a block of landscape drops in relation to the
> surrounding.  On each side of the graben will be steep sloped escarpments. 
> A
> horst is the highland between two grabens that remained at the same 
> elevation of
> may have been up-thrusted.
>
> In the example you posted the movement was a few inches/feet left and 
> right of
> the escarpments( parallel lines) as well as a downward movement of the 
> valley
> floor a distance I am unable to determine from the photo but could have 
> been
> tens to hundreds of feet.  This is not a slip strike fault where the 
> opposite
> sides are displaced laterally.
>
> I've read recently about contraction of the lunar crust owing to overall
> cooling producing these features.  On a lunar-wide basis when the formerly
> liquid mantle transitioned to a solid the sum total of all the nanometer 
> sized
> compression of the space between molecules is seen on the surface as these
> grabens.  The link above shows a substantial graben on the moon.
>
>
> To read about recent graben formation on earth you might google the 
> 1811-1812
> New Madrid Earthquare 
> or<http://en.wikipedia.org/wiki/New_Madrid_Seismic_Zone>
> and the formation of the ReelFoot lake in western Tennessee. That area 
> lies on a
> failed rift where North America almost split.  I think the Reelfoot Lake 
> basin
> came from a graben drop of only about 6 ft but left a lake of 30 square 
> miles
> and about 3 ft /1meter deep.
>
> Elton
>
>
>
> ----- Original Message ----
>> From: Jerry Flaherty <grf2 at comcast.net>
>> To: Ron Baalke <baalke at zagami.jpl.nasa.gov>; Meteorite Mailing List
>><meteorite-list at meteoritecentral.com>
>> Sent: Fri, October 8, 2010 8:22:25 PM
>> Subject: Re: [meteorite-list] Mars Odyssey THEMIS Images: October 4-8, 
>> 2010
>>
>> A little geologic help please.
>> In the image "Alba Mons Tectonics" could  someone elucidate and elaborate 
>> on
>> the tectonic features shown.
>> Are we  looking at a rift at one or both parallel "lines" depicted and if 
>> so:
>> are the  lines related
>> what is the direction of the movement
>> what specific features  demonstrate this movement
>> any other features which demonstrate tectonic  activity that I'm not 
>> seeing
>> Thanks to any respondents in advance
>> Jerry  Flaherty
>> --------------------------------------------------
>> From: "Ron Baalke" <baalke at zagami.jpl.nasa.gov>
>> Sent:  Friday, October 08, 2010 5:55 PM
>> To: "Meteorite Mailing List" <meteorite-list at meteoritecentral.com>
>> Subject:  [meteorite-list] Mars Odyssey THEMIS Images: October 4-8,  2010
>>
>> >
>> > MARS ODYSSEY THEMIS IMAGES
>> > October 4-8,  2010
>> >
>> > o Wind Erosion (04 October 2010)
>> >   http://themis.asu.edu/zoom-20101004a
>> >
>> > o Pavonis Mons (05 October  2010)
>> >  http://themis.asu.edu/zoom-20101005a
>> >
>> > o Wind  Texture (06 October 2010)
>> >   http://themis.asu.edu/zoom-20101006a
>> >
>> > o Central Peak Crater (07  October 2010)
>> >  http://themis.asu.edu/zoom-20101007a
>> >
>> >  o Alba Mons Tectonics (08 October 2010)
>> >   http://themis.asu.edu/zoom-20101008a
>> >
>> >
>> > All of the THEMIS  images are archived here:
>> >
>> >  http://themis.asu.edu/latest.html
>> >
>> > NASA's Jet Propulsion  Laboratory manages the 2001 Mars Odyssey mission
>> > for NASA's Office of  Space Science, Washington, D.C. The Thermal 
>> > Emission
>> > Imaging System  (THEMIS) was developed by Arizona State University,
>> > Tempe, in co.oration  with Raytheon Santa Barbara Remote Sensing.
>> > The THEMIS investigation is  led by Dr. Philip Christensen at Arizona 
>> > State
>> > University. Lockheed  Martin Astronautics, Denver, is the prime 
>> > contractor
>> > for the Odyssey  project, and developed and built the orbiter. Mission
>> > operations are  conducted jointly from Lockheed Martin and from JPL, a
>> > division of the  California Institute of Technology in Pasadena.
>> >
>> >
>> >
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