FACIES ANALYSIS AND SEDIMENTARY ENVIRONMENTS OF CARBONATE ROCKS OF THE TARBUR FORMATION IN SEMIROM AREA

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SAFARI AMR ELAH; VAZIRI MOGHADAM H.; LASEMI Y.

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Journal Paper

Paper Information

Journal: RESEARCH JOURNAL OF UNIVERSITY OF ISFAHAN "SCIENCE" Year:2008 | Volume:29 | Issue:3 (GEOLOGY) Page(s): 169-188

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Information Journal Paper

Title

FACIES ANALYSIS AND SEDIMENTARY ENVIRONMENTS OF CARBONATE ROCKS OF THE TARBUR FORMATION IN SEMIROM AREA

Author(s)

SAFARI AMR ELAH | VAZIRI MOGHADAM H. | LASEMI Y. | Issue Writer Certificate

Keywords

FACIESQ3

MICROFACIESQ3

SEDIMENTARY ENVIRONMENTQ3

TARBUR FORMATIONQ3

Abstract

In order to determine the microFACIES and SEDIMENTARY ENVIRONMENT of the TARBUR FORMATION, one stratigraphic section in 15 Km SW of Semirom was sampled and studied.In the studied area the TARBUR FORMATION with 804 m thickness, composed of carbonate and terrigenous rocks, which deposited during Maastrichtian. The lower boundary with Amiran Formation is conformable and the upper boundary with Kashkan Formation is marked by an erosional surface.According to the lithological and petrographic characteristics of the TARBUR FORMATION five lithoFACIES units were recognized in Semirom area.Field studies and obtained data from microscopic thin sections led to recognition of 7 carbonate FACIES attributed to lagoon (L1, L2, L3), bar (B1, B2) and open marine (O1, O2) subenvironments and 4 terrigenous FACIES interpreted as shallow (Lsh) to deep marine (Osh) setting and meandring river (Fss, Fsh) system.The TARBUR FORMATION was formed in a carbonate platform (epicontinental sea) in a homoclinal ramp. presence of rudist debris indicates a photozone assemblage and suggests a tropical condition for deposition of the carbonate sediments.

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