Dear Hakima, 

It's kinda dreamy! I think these features constituted when a sea or a large saline lake dry up. In fact these photos contains salt deposits with gradually drying up and may be with a various composition that arise from chemical composition of sea water.

Best Regards,

Nima

Dear Nima,

Thank you so much for you explication for this geological fenomena.

so all pictures contains the salt deposits (or evaporite) native from chemical composition of sea water.

many thanks for your reactivity, time and interest.

Best regards,

Hakima

Dear Hakima,

as explained in the facebook account these are salt deposits were formed during the “Messinian Salinity Crisis”. Those deposits seams to have been deformed either by diapirism or tectonics, however the "eyes" of the first and third pictures is more an optical illusion due to a "dome shape" digging through the tilted layers.

The layers are mainly made of salt, but the darker ones are probaly enriched in clay , silt, and organic material.

Cheers

Dear Jérôme,

Thank you so much for your explication it was very interesting to me.

many thanks for your reactivity, time and interest.

Best regards,

Hakima

I agree completely with Jerome (I once saw similar things underground in a halite mine in Europe). Spectacular!

Hakima, Jerome's explanation covers the ground excellently. 

This type of pictures once was displayed as being from Russian mines. Amazing beauty! Genesis waits for comments from experts.

regards

ijaz

Ijaz, I think the phenomena are well enough known and Jeromes explanation clear and accurate enough that there is no need for further discussion from experts - such features are not all that uncommon, although these are superb examples.

I had no explanation but a great thanks to have made this geological impressive pictures available to many of us

Sincerely

Yes, thank you, I enjoyed them

Is it tunnel in deformed deep sea chert deposit. Because such a big tunnel standing without any  support in a soft rock is unlikely

Without knowing anything other than these pictures, it looks like sedimentary layering with soft-sediment deformation in salt deposits.

Hi Hakima,

Such patterns were admired even 100 years ago of visitors and miners underground of the salt mine Marosujvar in Romania (see images attached). The original alternation of flat layers of pure rock salt (light) and clay impurities (dark) was bent and erected steep by salt tectonics. The photographs are printed on historic picture postcards (out of my collection).

Best regards,

Guenter

Dear Devojit: Those pictures are of famous and spectacular salt mines of Realmonte, near Racalmuto (Agrigento Province), in southern Sicily, Italy. It is a diapiric salt dome which shows intense folding due to its plastic behaviour during intrusion. The layers alternate between white halite rock-salt and reddish sylvite with clay, making the wonderful pattern shown. In other parts of this same dome Ca-sulphates have been reduced by bacteria to form wonderful sulphur crystals associated with celestite, aragonite and rare hauerite octahedra. I have samples of all of these minerals in my collection, as my parents were born in Sicily! Regards, Sebastian. 

Dear Martin, John

Thank you so much for your confirmation to the Jerome's explanation. Now it is clear for me.

Liaz, Jacques, Devojit, Kevin and Sebastián:

Many thanks for your reactivity, time and interest.

Guenter,

Thank you so much for your response and for the attached files, i enjoy it.

Regards,

Hakima

Thanks for your explanation

If any one knows this geological phenomenon. -ResearchGate. Available from: https://www.researchgate.net/post/Does_any_one_knows_about_this_geological_phenomena#view=58073d03cbd5c22fa2117733 [accessed 19 Oct 2016].

Dear, every geologist and miner must know this. Of course not all details but this phenomenon of salt mines with inclusions of other minerals color in nature, are given a different color-very nice and cheerful.

Respect, Mirko