RECONSTRUCTION OF PALEOENVIRONMENT OF ZIYARAT FORMATION, BASED ON LARGE BENTHIC FORAMINIFERA (UPPER PALAEOCENE - MIDDLE EOCENE), ALBORZ

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KHATIBIMEHR M.; ADABI M.H.; LOTFPOUR M.; MOALEMI A.

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Journal: Iranian Journal of Geology Year:2008 | Volume:2 | Issue:7 Page(s): 25-38

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Information Journal Paper

Title

RECONSTRUCTION OF PALEOENVIRONMENT OF ZIYARAT FORMATION, BASED ON LARGE BENTHIC FORAMINIFERA (UPPER PALAEOCENE - MIDDLE EOCENE), ALBORZ

Author(s)

KHATIBIMEHR M. | ADABI M.H. | LOTFPOUR M. | MOALEMI A. | Issue Writer Certificate

Keywords

ZIYARATQ3

FORMATIONQ3

BENTHIC FORAMINIFERAQ2

PALAEOENVIRONMENTQ2

PALAEOCENE - EOCENEQ2

ALBORZQ2

Abstract

The ZIYARAT FORMATION (Upper Paleocene to Middle Eocene) is a carbonate sequences, exposed north of Tochal Village (south-east of Tehran), near Emam Zadeh Abdollah. The ZIYARAT FORMATION with the total thickness of 2l2.5 m is conformably overlies the Fajan conglomerate and is overlain by greenish tufaceous siltstone of the Karj FORMATION. The age of Upper Paleocene to Middle Eocene was considered for the ZIYARAT FORMATION at the type section. Carbonate sequences of the Ziyart FORMATION consist mainly of large BENTHIC FORAMINIFERA (e.g., nummulites and discocyclina) along with other skeletal and non-skeletal components. The water depth during deposition of this FORMATION was determined based on the variation and type of different BENTHIC FORAMINIFERA, as well as other components in different facies. Microfacies analysis led to recognition of 11 microfacies that are related to 3 sub-environments such as inner ramp, middle ramp and outer ramp. Five microfacies such as evaporite, dolomudstone, ooid intraclast packstone to grainstone, miliolidae wackestone and alveolina nummulite packstone were recognized in the inner ramp. Four microfacies such as nummulite packstone, red algae nummulite packstone, discocycline nummulite wackestone and nummulite discocycline wackestone to packstone are belonging to middle ramp. Finally, two microfacies such as benthic foraminifers' packstone and radiolar sponge spicule wackestone were distinguished to have been deposited in outer ramp sub-environment. In this study, an absence of calciturbidite deposits, reefal facies, gradual facies changes and widespread tidal flat deposits, support that the Ziayart FORMATION was deposited in a (homocline) carbonate ramp environment. Due to the great diversity and abundance of larger BENTHIC FORAMINIFERA, this carbonate ramp is referred to as a "foramdominated carbonate ramp system".

Cites

DIAGENESIS AND GEOCHEMISTRY OF THE ZIYARAT FORMATION IN THE TYPE SECTION, TOCHAL, (ALBORZ)

References

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APA: Copy

KHATIBIMEHR, M., ADABI, M.H., LOTFPOUR, M., & MOALEMI, A.. (2008). RECONSTRUCTION OF PALEOENVIRONMENT OF ZIYARAT FORMATION, BASED ON LARGE BENTHIC FORAMINIFERA (UPPER PALAEOCENE - MIDDLE EOCENE), ALBORZ. IRANIAN JOURNAL OF GEOLOGY, 2(7), 25-38. SID. https://sid.ir/paper/129437/en

Vancouver: Copy

KHATIBIMEHR M., ADABI M.H., LOTFPOUR M., MOALEMI A.. RECONSTRUCTION OF PALEOENVIRONMENT OF ZIYARAT FORMATION, BASED ON LARGE BENTHIC FORAMINIFERA (UPPER PALAEOCENE - MIDDLE EOCENE), ALBORZ. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2008;2(7):25-38. Available from: https://sid.ir/paper/129437/en

IEEE: Copy

M. KHATIBIMEHR, M.H. ADABI, M. LOTFPOUR, and A. MOALEMI, “RECONSTRUCTION OF PALEOENVIRONMENT OF ZIYARAT FORMATION, BASED ON LARGE BENTHIC FORAMINIFERA (UPPER PALAEOCENE - MIDDLE EOCENE), ALBORZ,” IRANIAN JOURNAL OF GEOLOGY, vol. 2, no. 7, pp. 25–38, 2008, [Online]. Available: https://sid.ir/paper/129437/en

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