Mendeley
TY  _  JOUR
ID  -  13991127262233
TI  -  Foramniferal morphogroups of the Qom Formation in E Sirjan and SW Kashan: implication for paleoenvironmental and paleoecological interpretations
JO  -  Iranian Journal of  Petroleum Geology
JA  -  ES
LA  -  fa
SN  -  2251-8738
AU  -  Mohammadi Ebrahim 
AD  -  دانشگاه تحصيلات تکميلي صنعتي و فناوري پيشرفته، کرمان
Y1  -  2021
PY  -  2021
VL  -  20
IS  -  
SP  -  82
EP  -  94
KW  -  Qom Formation
KW  -   Oligo-Miocene
KW  -   epifaunal
KW  -   test morphology
KW  -   paleoecology
KW  -   feeding strategy
DO  -  
N2  -  The Qom Formation is the main reservoir and source rock of hydrocarbons in central Iran. Foraminifera are now central to our ability to date, correlate and analyse the sedimentary basins that are currently key to the economic wellbeing of the world. Morphogroup analysis, due to independence of  species  level taxonomy, as wel as permit to  comparison  of  assemblages  of  differing  ages, is a useful tool for  ecological  and palaeoecological interpretation.  It is  independent  of  species  level taxonomy  and  is thus  relatively elementary  to  translate  from  one worker  to  another.  Foramniferal study of the Qom Formation in the Bujan (eastern Sirjan; with Rupelin-Chattian in age and 156 m thickness) and Varkan (southwestern Kashan; with Rupelin in age and 190 m thickness) sections resulted in identification of seven morphogroups.
The morphogroups were distinguished according to test/shell morphology and architecture (general shape, mode of coiling, and arrangement and number of chambers), inferred life habitat either living on the surface of the sediments or within the sediments (epifaunal and infaunal), and feeding strategy (suspension-feeder, herbivore, etc.). Generaly, epifaunal morphogroups were dominated in both study sections. The morphogroup analyses showed variations in the percentage of the dominant morphotypes, suggesting fluctuations in the paleoecological conditions. In the Bujan section, the Rupelin deposits are dominated by calcareous porcelaneous morphogroups; while the Chattian deposits are dominated by hyaline morphogroups, which indicates the lower and upper parts were deposited in inner ramp (lagoonal environments) and middle ramps, respectively. This significant change through time reffers to gradual increasing of the basin depth, decreasing the light intensity, reducing the salinity and decreacing the nutrient level. De dominance of the hyaline morphogroups throughout of the Varkan section is indicative of the deposition in middle ramp environments with normal salinity under meso-photic to oligo-photic conditions.

UR  - rimag.ir/en/Article/33927
L1  - rimag.ir/en/Article/Download/33927
ER  -  
