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Paper Information

Title: 

A 3D IMAGE OF ILJAQ POTASH RESERVE AND SALT STRUCTURE, SOUTH OF ALBORZ BELT

Type: PAPER
Author(s): FARHADI R.*
 
 *GENERAL EXPLORATION GROUP, GEOLOGICAL SURVEY OF IRAN
 
Name of Seminar: SYMPOSIUM OF EARTH SCIENCES
Type of Seminar:  SYMPOSIUM
Sponsor:  ORGANIZATION OF GEOLOGICAL OF IRAN
Date:  2006Volume 24
 
 
Abstract: 

Alborz belt extends for about 1000 kilometers from Aras Fault (west of the South Caspian Depression) to the south of Kopeh Dagh in north of Iran. Miocene sediments and evaporate deposits which called Upper Red Formation in foreland basins in the south of Alborz nappes are simply folded so strata are horizontal to vertical therefore rounded hills upon plains or walls of sandstone and cliffs over hanging valleys with numerous obvious or hidden salt structures are the most common morphs. Iljaq salt structure is formed by gypsum, salt and potash plays which are covered by marls, sandstone and conglomerates.
Iljaq is a swollen circular salt structure which its topography in rims is higher than the center, dip of the strata near the rim is almost 90 degrees and a vertical gypsum layer around the structure in the top of ring shows the border of salt. The origin of pure secondary picromerite and halite in the southern rim is the primary potash layers or lenses, therefore an intersecting radial core drilling plan designed and
was done. Underground data show the conical structure is built by intrusion of salt into the crest of a double plunge incline anticline as the stratigraphic column is stay without any change but flow folds are distinguishable in potash zone. After structural analysis and according to the roll of nearest the potash reserve is more than 2,000,000 tons and the average grade of potash minerals is 57.3%.

 
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