Microfacies Study of Asmari Formation in the Northwest and Southeast of Shiraz, Iran (original) (raw)
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In this study a stratigraphy section of Asmari Formation is selected from Bavan Mountain-in Fars province,Iran-and 401.5 meter of this Formation's sediment is studied in total. Its index microfacies are carefully determined through studying of 152 thinsections. This research shows that the index microfacies in the studied sections are Mudstone, Wackestone, Packstone, Grainstone and the amount of microfacies elements such as bioclast,pellet,extraclast and intraclast are varied in different parts of the studied section and totally the amount of bioclast in the section is more than other elements. quantitative study of the microfacies of the Asmari Formation Bavan Section in northwest Shiraz. Researcher. 2011: 3 (10): 36 -40] (ISSN: 1553-9865). http://www.sciencepub.net/researcher.
In this study a stratigraphy section of Asmari Formation is selected from Bavan Mountain-in Fars province,Iran-and 401.5 meter of this Formation's sediment is studied in total. Its index microfacies are carefully determined through studying of 152 thinsections. This research shows that the index microfacies in the studied sections are Mudstone, Wackestone, Packstone, Grainstone and the amount of microfacies elements such as bioclast,pellet,extraclast and intraclast are varied in different parts of the studied section and totally the amount of bioclast in the section is more than other elements. quantitative study of the microfacies of the Asmari Formation Bavan Section in northwest Shiraz. Researcher. 2011: 3 (10): 36 -40] (ISSN: 1553-9865). http://www.sciencepub.net/researcher.
Oligocene-Miocene Microfacies study of Asmari Formation (NW - SE of Shiraz, Iran)
Iranian Journal of Earth Sciences
In this research, totally 610.4 meters of the Asmari Formation are studied in two stratigraphic sections on Bavan Mountain and Sarvestan section in Fars province, Iran. The indexed microfacies are carefully determined through studying of 230 thin sections. This research shows that the indexed microfacies are mudstone, wackestone, packstone, prainstone and the amount of microfacies elements such as bioclasts, pellets, extraclasts and intraclasts. They are varied in different parts of the studied sections and the total amount of bioclasts in the section is more than other elements. The abundance of benthic bioclasts represents the regression of the basin from the open sea into the sub tidal and intertidal zone.
Iranian Journal of Earth Sciences, 2018
In the present research Kuh-e Siah Section in the Northeast of Shiraz in the Interior Fars, was investigated to study microfacies, sequence stratigraphy, facies analysis and sedimentary environment of Fahliyan Formation. Generally, 345 meters of these sediments were studied by investigating 240 thin sections. In this study, the indicator microfacies were accurately identified which include Mudstone, Wackestone, Packstone and Grainstone. Besides, skeletal and non-skeletal grains of these microfacies are Intraclast, Bioclast, Exteraclast and Peloid. According to lithostratigraphic study, underneath limit of Fahliyan Formation with the Surmeh Formation and its upper contact with Gadvan Formation were in the gradual form (SB2) and included (TST-LST-Early HST-Late HST) system tracts. In general, there were two second-degree sequences in this section., According to the analysis of the sedimentary environment, the The lowermost of the Fahliyan Formaion is comprised of the Inner shelf depos...
Open Journal of Geology, 2013
The Fahliyan Formation is a carbonate sequence of Lower Cretaceous (Berriasian-Hauterivian) in age and was deposited in the Zagros sedimentary basin. This formation is a part of Khami Group and is a reservoir rock in Zagros Basin. This formation was investigated by a detailed petrographic analysis in order to clarify the depositional facies and sedimentary environment in the Kuh-e-Gadvan in Fars Province. Petrographic studies led to the recognition of nine microfacies that were deposited in four facies belts: tidal flat, lagoon, and barrier and shallow open-marine. An absence of turbidite deposits, reefal facies, and gradual facies changes indicate that the Fahliyan Formation was deposited on a carbonate ramp.
Geopersia, 2011
The Asmari Formation was deposited in the foreland basin of southwest Iran (Zagros Basin). Carbonate sequences of the Asmari Formation consist mainly of large benthic foraminifera along with other skeletal and non-skeletal components. Three assemblage zones have been recognized by distribution of these large foraminifera in the study area that indicate Oligocene age (Rupelian-Chattian). Absence of turbidite deposits, reefal belt and gradual facies changes indicate that the Asmari Formation was deposited in a carbonate ramp environment. Based on analysis of large benthic foraminiferal assemblages and microfacies features nine different microfacies have been recognized, which can be grouped into three depositional environments: inner, middle and outer ramp. Based on the microfacies analysis and sequence stratigraphic studies, two third-order sequences in Firozabad section were identified.
Himalayan Geology
The Fahliyan and Gadvan formationsof Lower Cretaceous age (Neocomian-Early Aptian) exposed on Kuh-e-Surmeh section were studied in order to evaluate microfacies, depositional environment and sequence stratigraphy. Petrographic study led to recognition of 18 microfacies deposited in five subenvironment : pelagic, hemipelagic, middle shelf, inner shelf, coastal plain. Sequence stratigraphy assessment of these deposits revealed three depositional sequence of third order of which the two lower ones belong to the Fahliyan Formation and the third one related to the Gadvan Formation. Except for the lower boundary of the sequence, the other boundaries are type 2
Open Journal of Geology, 2016
The Sarvak Formation is the second major oil-bearing reservoir in the south and south west of Iran. The Middle Cretaceous Sarvak formation in the Zagros Mountains (Zagros Basin) is mainly composed of carbonate sequences. Based on facies studied, thirteen microfacies were recognized in the studied area, which were categorized in the three facies groups: including inner ramp, mid ramp and outer ramp. Evidences such as the gradual changes in the facies (basin slope), the absence of extensive uninterrupted barrier reef, the lack of calciturbidite and gravity sediments as well as the high proportion of grain-supported indicated that the Sarvak Formation was deposited in the ramp like depositional system, particularly on an inner ramp setting. Inner ramp facies group is the principal setting and subdivided to tidal flat, restricted and unrestricted lagoon as well as shoal sub-environments.
The Oligocene-Miocene Asmari Formation is a thick sequence of shallow water carbonates of the Zagros Basin. Khaviz Anticline outcrop [near Behbahan city/Iran] was studied in this research in order to interpret the facies, depositional environment and sequence stratigraphy of the Asmari Formation succession. In this study, twelve different microfacies types have been recognized, which can be grouped into five (micro) facies associations: peritidal, lagoon, shoal, semi restricted marine and open marine. The Asmari Formation represents sedimentation on a carbonate ramp. According to the fauna data, the Asmari Formation is Oligocene (Rupelian/Chattian) to Early Mi-ocene (Burdigalian) in age at the study area. Eight third-order depositional sequences are identified on the basis of deepening and shallowing patterns in the microfacies. The depositional sequences 0 and 1 (Rupelian-Chattian), 2, 3 and 4 (Chattian) were referred to the lower while sequences 5 and 6 (Aquitanian) were referred to the middle and sequence 7 (Burdigalian) was referred to the upper Asmari Formation. The relative sea-level curve of the Asmari basin and its matching with the global sea-level curves documented that Global eustatic phenomena affected this basin.
Iraqi Geological Journal, 2024
The present work involves the study of the Asmari Formation from the viewpoint of the stratigraphy, microfacies, and depositional environment. The Khorramabad area, Zagros basin, west Iran, has been investigated for the first time. For this purpose, seventy-three samples were taken from the Shurab section. Eight microfacies have been identified in the Asmari Formation: Sandy wackestone (MF1), Peloidal Mudstone (MF2), Bioclastic milina Wackestone-Packstone (MF3), Bioclastic imperforate foraminifera Wackestone-Packstone (MF4), Coral boundstone (MF5), Bioclastic packstone-grainstone (MF6), Bioclastic imperforate foraminifera grainstone (MF7), Mudstone microfacies (MF8). Two benthic foraminiferal biozones were recognized, which are Archaias asparagus-Archaias Henson Assemblage Zone, which is restricted to Chattian, and the Eulepidina-Miogypsina Assemblage Zone, which is restricted to Aquitanian. The biostratigraphic correlation with other studies in and outside Iran, executed across the studied section, enveloping the Chattian to Aquitanian, divulges a progression in the biozone thickness, indicating a migration of the depositional center towards the northwest of the basin. The Asmari Formation is deposited from an outer ramp and open shelf lagoon and is defined as a tropical environment.