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

From: Jerry Flaherty <grf2_at_meteoritecentral.com>
Date: Sat, 9 Oct 2010 14:53:54 -0400
Message-ID: <C4EE86F07B7D4B8997074B7E83175DFE_at_JerryPCBamboo>

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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Received on Sat 09 Oct 2010 02:53:54 PM PDT