RECONSTRUCTION OF THE SEDIMENTARY ENVIRONMENT OF SILICICLASTIC-CARBONATE SEDIMENTS OF THE AMIRAN FORMATION (UPPER CRETACEOUS-PALEOCENE) IN SW LORESTAN

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NASIRI Y.; MAHBOUBI A.; MOUSSAVI HARAMI R.; KHAZAEI A.R.; YOUSEFI B.

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Journal: Iranian Journal of Geology Year:2013 | Volume:7 | Issue:27 Page(s): 55-74

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Title

RECONSTRUCTION OF THE SEDIMENTARY ENVIRONMENT OF SILICICLASTIC-CARBONATE SEDIMENTS OF THE AMIRAN FORMATION (UPPER CRETACEOUS-PALEOCENE) IN SW LORESTAN

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Keywords

AMIRAN FORMATIONQ2

SUBMARINE FANQ2

CARBONATE PLATFORMQ3

ZAGROS BASINQ1

Abstract

The AMIRAN FORMATION (Upper Cretaceous-Paleocene) has an excellent exposure in the Lurestan Province in the ZAGROS BASIN. In order to interpret depositional environment of this interval, two stratigraphic sections (type and Pirshamsedin section) were measured and sampled. The thicknesses are 890 and 920 in these two sections, respectively. The lower boundeary of the AMIRAN FORMATION at the type section is sharp with Gurpi Formation and Upper boundeary is gradual with the Talezang Formation. This formation is composed of lithofacies conglomerate, sandstone, mud rocks, and carbonates. The AMIRAN FORMATION in the study area is composed of two units, carbonate (in the basal and upper parts) and siliciclastic facies (in the middle and upper parts). Based on petrographic studies, 8 silisiclastic petrofacies and 18 carbonate microfacies have been identified. The carbonate microfacies are deposited in 3 facies belts including open marine, barrier and Lagoon in a carbonate ramp system. Most of the identified rudists in this formation are elevator, horizontal and individual types constratal fabric and are usually present in the lagoonal deposits. Based on dictyoptychus genera, especially luftusia general, Maastrichtian age is suggested for this unit. Siliciclastic rocks in this formation consist of shale, siltstone, calclithite, lithic graywacke, chert arenite and ortho-micro conglomerate petrofacies. Based on the petrography and present of the sedimentary structures such as gradded-beds, Bouma sequence etc. they are deposited by turbidity currents in the slope and sub marine fans.

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APA: Copy

NASIRI, Y., MAHBOUBI, A., MOUSSAVI HARAMI, R., KHAZAEI, A.R., & YOUSEFI, B.. (2013). RECONSTRUCTION OF THE SEDIMENTARY ENVIRONMENT OF SILICICLASTIC-CARBONATE SEDIMENTS OF THE AMIRAN FORMATION (UPPER CRETACEOUS-PALEOCENE) IN SW LORESTAN. IRANIAN JOURNAL OF GEOLOGY, 7(27), 55-74. SID. https://sid.ir/paper/129487/en

Vancouver: Copy

NASIRI Y., MAHBOUBI A., MOUSSAVI HARAMI R., KHAZAEI A.R., YOUSEFI B.. RECONSTRUCTION OF THE SEDIMENTARY ENVIRONMENT OF SILICICLASTIC-CARBONATE SEDIMENTS OF THE AMIRAN FORMATION (UPPER CRETACEOUS-PALEOCENE) IN SW LORESTAN. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2013;7(27):55-74. Available from: https://sid.ir/paper/129487/en

IEEE: Copy

Y. NASIRI, A. MAHBOUBI, R. MOUSSAVI HARAMI, A.R. KHAZAEI, and B. YOUSEFI, “RECONSTRUCTION OF THE SEDIMENTARY ENVIRONMENT OF SILICICLASTIC-CARBONATE SEDIMENTS OF THE AMIRAN FORMATION (UPPER CRETACEOUS-PALEOCENE) IN SW LORESTAN,” IRANIAN JOURNAL OF GEOLOGY, vol. 7, no. 27, pp. 55–74, 2013, [Online]. Available: https://sid.ir/paper/129487/en

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