Writers : Mirab Shabestary, Gh. R.; Riasi, M.
Refference : 28th Symposium on Geosciences and the 14th Symposium on Geological Society of Iran
Publishing Year : 1389

Abstract :

The aim of this research is the investigation of diagenetic processes and determination of microfacies and depositional environment of Badamu Formation (Middle Jurassic) which was achieved using detailed field observations supplemented by laboratory studies. The studied area is located in south-east of Sarayan city (Southern Khorasan province), east of lut Block/Iran. The total thickness of the formation in the studied section is 133 m and mainly is dominated by bioclastic grainstones, packstones and bioclastic wackestones. Petrographic studies reveal that the most important skeletal fragments in the studied section are bivalve, brachiopod, crinoidea, echinoderm, green algae, red algae and foraminifera. Furthermore, peloids and intraclasts are significant non-skeletal fragments and quartz grains are the main non-carbonate detrital fragments. The most important diagenetic processes which have had effects on this formation consist of cementation, aggrading neomorphism, replacement, dissolution, mechanical compaction and bioturbation. The study of diagenetic processes shows the influence of three diagenetic environments including meteoric, marine and burial conditions. In general, five microfacies within the barrier and open marine facies are recognized In this sequence, the barrier facies shows the maximum thickness. Finally, based on the microfacies characteristics, a rimmed-shelf is the suggested environment for deposition of Badamu Formation sequence in the studied area.

Subject List : sedimentary Environment