Geochemistry and petrography of Garau Formation with Neocomian-Aptian age in type section (Kabir Kuh, Ilam province)

Authors

1 Ph.D student, Department of Geology, Shahid Beheshti University

2 Professor, Department of Geology, Shahid Beheshti University

3 Assistant Professor, Department of Geology, Shahid Beheshti University

4 Associate Professor, Department of Geology, Shahid Beheshti University

Abstract

 In order to understand facies belts, depositional environment, original carbonate mineralogy, paleotemperature and diagenetic environment, 624 m of the Garau Formation (Neocomian-Aptian) in type section (SW flank of Kabirkuh Anticline, in Lurestan province) was investigated by petrographic and geochemical analyses. Lower boundary of this formation is not exposed in the type section, but it overlies the Gotnia Formation in well no. 1 of Kabir Kuh and overlain by the Sarvak Formation. It is believed that the Garau Formation is a source rock in  the Zagros Basin. Facies studies led to the recognition of deep marine facies belt. Absence of turbidite deposits and reefal facies and existence of peloid facies indicate that the Garau Formation was deposited in a carbonate ramp environment. Major and minor elements and carbon and oxygen isotope values were used to determine the original carbonate mineralogy of the Garau Formation. Elemental evidences (such as high Sr value) and oxygen and carbon isotope values indicate that aragonite was the original carbonate mineralogy of this formation. Major and minor elements and carbon and oxygen isotope values (variations of Sr/Ca and 18O values versus Mn) suggest that diagenetic alteration occurred in an open diagenetic system. Temperature calculation based on the oxygen isotope value of the least-altered samples, using Anderson and Arthur (1983) equation, indicates that paleotemperature was 29.2° C.
 

Keywords

References

 
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Journal of Stratigraphy and Sedimentology Researches
Volume 27, Issue 2 - Serial Number 2
September 2011
Pages 1-26

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