مدلهای دولومیتی شدن سازند الیکا در منطقه بلبل خوان آمل

Dolomitization is one of the major processes of diagenesis in Elika formation . This  formation  is  located  in  the north Alborz  within  Emarat anticlinorium  with 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 : ۱- fine crystal dolomites together with evaporitive mineral , mud cracks and stromatolites , ۲ - planar  euhedral  shape dolomites with vados silt and ۳ -  saddle dolomites which have undulos extinction and also dolomites are associated with

     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