Dolomitization models of Elika formatiOn in the Bolbol-Khan area , Amol

Category Sedimentology
Group GSI.IR
Location 20th symposium on geosciences
Holding Date 16 April 2008

     Dolomitization is one of the major processes of diagenesis in Elika formation.This formation is located in the north Alborz within Emarat anticlinoriumwith Permian rocks in the core of anticlinorium . According to the studies of staining thin section, polished handspacimens and SEM, processes of dolomitization distinguished Dolomites are three categories : I- fine crystal dolomites together with evaporitive mineral , mud cracks and stromatolites , 2 - planar euhedral shape dolomites with vados silt and 3 - saddle dolomites which have undulos extinction and also dolomites are associated with stylolite.
Dolomitization in Elika formation is consided with three models : sabkha , meteoric - marine mixing zone or Dorag and burial . Sources of the Mg for dolomitization are HMC and connat water within formation . On the other hand, the effect of shales of Shemshak formation can”t be ignored , because of dolomitization processes at top of Elika formation is more than other portion of it.