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Sandstone #2


Sandstone #2
Photo Information
Copyright: Ioannis Logiotatidis (logios) Silver Star Critiquer/Gold Note Writer [C: 18 W: 3 N: 76] (258)
Genre: Landscapes
Medium: Color
Date Taken: 2005-05-14
Categories: Mountain
Camera: Nikon D70, Nikon 18-70mm, HOYA 67.0 mm SCYLIGHT 1B
Exposure: f/8, 1/250 seconds
Photo Version: Original Version
Theme(s): Sandstone Petra, Jordan [view contributor(s)]
Date Submitted: 2005-11-10 8:56
Viewed: 2140
Points: 8
[Note Guidelines] Photographer's Note
An other very beautiful sandstone in the same place of Petra The previus picture

Petra is one of the world's most beautiful architectural sites carved from some of the oldest exposed sandstone on Earth (Cambrian and Ordovician sanstone that is 450-550 million years old). However, the sandstone in Petra is typical in that it is comprised of colorless quartz clasts (the particles in sandstone) attached by a matrix binding that is composed of silica (Si), calcium (Ca), iron (Fe), aluminum (Al), manganese (Mn) and minor amounts of others (sodium (Na), lithium (Li), etc.). So the colors are only a function of colorants present in the matrix: browns from iron, yellows from Na and Fe, pinks from Na and Li, etc.

These minor matrix elements (ie. Ca, Mg, Mn, Fe, etc.) have mobilized and separated into what is commonly called 'Liesegang Banding' (banding in color and composition of ores caused by diffusion). However, the banding has been erroneously (and commonly) attributed to its deposition, but in fact when examined (and often simply observed) the original bedding (from coastal fluvial and dunal deposition) is unrelated to these spectacular colors that are not to be seen in the same way anywhere else on Earth.

In fact the colors are covered by a sort of 'drapery' given by recent and secondary deposition of simple calcium carbonates that are relased from the matrix and then redeposited atop and below the sandstone. This drapery is not very durable and is easily broken-off or eroded.
Source http://www.pa-chouvy.org/Photos/Jordanie/JordaniePetraRoches.htm.
You can see the theme of Jordan.
Janice, taba, taba has marked this note useful
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Critiques [Translate]

  • Great 
  • Janice Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3315 W: 148 N: 6113] (18648)
  • [2005-11-10 14:15]

Ioannis this is another super capture. The sandstone has so many beautiful colours and shapes. Heavy reading the notes, but it all means that the creation of this sandstone was an amazing job! Well shown, thank you...

  • Great 
  • taba Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 480 W: 128 N: 300] (1691)
  • [2005-11-10 18:37]

HI Ioannis
Fantastic capture.
The colours are unbelieveble...
Your composition and DOF are very good
great job.
Taba

  • Great 
  • samos Gold Star Critiquer [C: 81 W: 4 N: 2] (39)
  • [2005-11-25 5:32]

GIA SOU GIANNI EFHOME NA EISAI KALLA. POLI OMORFI OI FOTO FOVERA OMORFA HROMATA DIASPARTA STON VRAHO POLLI KATHARI FOTO EXIPNO KAI ORAIO KORNIZARISMA ME SEVASMO STAVROS

very nice and unique, thanks, Ori

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