Record details

    Salt Plugs in the eastern Zagros, Iran: Results of Regional Geological Reconnaissance
Statement of responsibility
    Pavel Bosák, Josef Jaroš, Jiří Spudil, Petr Sulovský, Vladimír Václavek
    Bosák, Pavel, 1951-
    Jaroš, Josef
    Spudil, Jiří
    Sulovský, Petr
    Václavek, Vladimír
Source title - serial
    Vol. 7
    p. 178
    105 obr., 18 tab., 8 s.bibl.
Subject group
    chemismus hornin
    geologie strukturní
    sedimenty karbonátové
    tektonika solná
    zvodnělý kolektor
Geographical name
Abstract (in english)
   Regional reconnaissance study of salt plugs covered the area of about 50,000 square kilometers (coordinates 53°50' to 56°30'E and 26°30' to 28°15'N). Altogether 68 salt plugs were characterized from the viewpoint of their position in the structure of area, morphological and evolution stages rock content and mineralization. Prevailing amount of plugs lies in the flanks of anticline folds and is bounded to fold plunges and sigmoidal bends, where the most favorable conditions are established for the salt plug intrusion. The position of plug is highly influenced by basement tectonics, too. Hydrogeological works proved the existence of regional and local aquifers. Upper regional aquifers are situated in the Baktyari Formation filling most of synclines, the lower is connected with Paleogene limestone units. The weathered zone of salt plugs shows its own hydrogeological regime and aquifers. Groundwater is highly mineralized, sometimes even in the upper aquifer.
   Waters can be classified as brackish to brines. Numerous are warm springs accompanied with hydrogen sulfide. Salt plugs were classified into three structural-morphological groups (circular, linear and combined). According to size, plugs are distinguished as small (below 4 km in diameter) and large. Activity of plugs was divided into three traditional groups, i.e. active, passive and ruins, each of groups being subdivided into three subgroups. Completely new criteria were adopted to estimate the activity in the most objective manner. Salt glaciers originated in surficial conditions by increasing creep caused by the hydration of salts. Movement of glaciers can be very fast if supplied in salt from plug vent. No anomalously increased temperature is needed to start the glacier flow. Unbreached salt plugs were discussed. Their occurrence is highly limited. It is shown, that "collapse structures" are connected rather with other processes than solution collapse after leached salt.
   Tectonic effects, erosion and pedimentation took part substantially in the formation of cauldrons. Linear cauldrons are connected with tension regime in the apical zone of anticlines. Primary and secondary rim synclines have not been yet detected. The origin of salt plugs was multicyclic process active at least since Paleogene. The distribution of exotic blocks in plugs was reintepreted from satellite images and air photos, indicating that the delineation, and deciphering of their lithologies is sometimes possible when the field knowledge is available. The soliferous Hormoz Complex was deposited in Upper Precambrian (Riphean-Vendian) to Middle Cambrian on rifted continental margins of Arabian Plate in a rectangular basin limited by deep (crustal) faults. New fossils have not been found.
   The Hormoz Complex represents product of deposition in evaporitic basin with multicyclic nature and repeating horizons of salts and other evaporites within carbonate-clastic-volcanosedimentary accumulations. The percentage and
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    3. 11. 2008
Import date
    8. 8. 2012