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Hosseini Asgarabadi, Zahra, Khodabakhsh, Saeed, Mohseni, Hassan, Abbassi, Nasrollah, Halverson, Galen, Hao Bui, Thi. (1397). Microfacies, geochemical characters and possible mechanism of rhythmic deposition of the Pabdeh Formation in SE Ilam (SW Iran). , 9(1), 89-109. doi: 10.22059/geope.2018.257280.648387
Zahra Hosseini Asgarabadi; Saeed Khodabakhsh; Hassan Mohseni; Nasrollah Abbassi; Galen Halverson; Thi Hao Bui. "Microfacies, geochemical characters and possible mechanism of rhythmic deposition of the Pabdeh Formation in SE Ilam (SW Iran)". , 9, 1, 1397, 89-109. doi: 10.22059/geope.2018.257280.648387
Hosseini Asgarabadi, Zahra, Khodabakhsh, Saeed, Mohseni, Hassan, Abbassi, Nasrollah, Halverson, Galen, Hao Bui, Thi. (1397). 'Microfacies, geochemical characters and possible mechanism of rhythmic deposition of the Pabdeh Formation in SE Ilam (SW Iran)', , 9(1), pp. 89-109. doi: 10.22059/geope.2018.257280.648387
Hosseini Asgarabadi, Zahra, Khodabakhsh, Saeed, Mohseni, Hassan, Abbassi, Nasrollah, Halverson, Galen, Hao Bui, Thi. Microfacies, geochemical characters and possible mechanism of rhythmic deposition of the Pabdeh Formation in SE Ilam (SW Iran). , 1397; 9(1): 89-109. doi: 10.22059/geope.2018.257280.648387

Microfacies, geochemical characters and possible mechanism of rhythmic deposition of the Pabdeh Formation in SE Ilam (SW Iran)

Geopersia
مقاله 38، دوره 9، شماره 1 - شماره پیاپی 22287825، فروردین 2019، صفحه 89-109    اصل مقاله (1.99 M)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22059/geope.2018.257280.648387
نویسندگان
Zahra Hosseini Asgarabadi1؛ Saeed Khodabakhsh* 1؛ Hassan Mohseni2؛ Nasrollah Abbassi3؛ Galen Halverson4؛ Thi Hao Bui4
1Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamadan, Iran
2Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran
3Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, Iran
4Department of Earth and Planetary Sciences, McGill University, Montr ́eal, Canada, QC H3A0E8
چکیده
Rhythmical alternations between limestone and marls characterize the Pabdeh Formation, southwestern Iran. Three intervals of these rhythmites were studied using sedimentary, petrography and geochemical parameters analysis, to unravel the possible mechanisms responsible for the origin of these rhythmites. The microfacies analysis reflects calm deep-water sedimentation that were interrupted by sporadic traction currents from shallow-marine. The geochemical analysis indicates the primary difference between limestones and marls in interval 1. However, for the intervals 2 and 3, there is no significant difference in the geochemical results between intercalated lithologies. The isotope data (δ18O and δ13C) for limestones and marl rhythms compared with Eocene marine calcite show post depositional alteration. Limestone–marl alternations in the interval 1, therefore, originated from the cyclic changes in siliciclastic input by shallow-water derived currents (probably turbidity currents). However, for the intervals 2 and 3, although the field observations (such as extensive lateral continuity of individual beds and sharp contact between different lithologies) and some of the sedimentological parameters such as existence of the microfossils with similar preservation quality, suggest the primary rhythm as a major mechanism, the geochemical data do not strongly support this conclusion.
کلیدواژه‌ها
Pabdeh Formation؛ Stable oxygen and carbon isotope؛ Zagros basin؛ limestone–marl alternations
عنوان مقاله [English]
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