Microfacies models and sequence stratigraphic architecture of the Oligocene–Miocene Qom Formation, south of Qom City, Iran

Amirshahkarami, Mahnaz; Karavan, M

doi:10.1016/j.gsf.2014.08.004

Cited by 18 publications

(5 citation statements)

References 29 publications

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“…The Late Oligocene–early Miocene marine deposits of the Qom fm (QF; Amirshahkarami & Karavan, ; Reuter et al, ), made of thin‐bedded fossiliferous marine limestone, light green marl with interlayers of tufaceous sandstone, and gypsiferous horizons, are discontinuously exposed in the northwestern sector of the study area (Figure ; Unconformity 4 in Figure ). The Qom Fm unconformably lies on top of the Palaeocene–Eocene strata in Mohammad Zurab and to the north of the Doruneh village (Ghaemi & Mussavi Herami, ), whereas the observed contacts with the LRF are characterised by a low‐angle angular unconformity (Figure d).…”

Section: Stratigraphy Of the Doruneh Fault Regionmentioning

confidence: 99%

“…The Late Oligocene-early Miocene marine deposits of the Qom fm (QF; Amirshahkarami & Karavan, 2015;Reuter et al, 2007), made of thin-bedded fossiliferous marine limestone, light green marl with interlayers of tufaceous sandstone, and gypsiferous horizons, are discontinuously exposed in the northwestern sector of the study area Figure 5e). In the southern sector of the study area, these deposits are discontinuous and are systematically observed in tectonic contact along faults with the previously described units (Behroozi et al, 1987;Farbod et al, 2011Farbod et al, , 2016Ghaemi & Mussavi Herami, 2008;Vahdati Daneshmand & Nadim, 1999) (Figures 2 and 3).…”

Section: Syn-breakup Units (Upper Cretaceous)mentioning

confidence: 99%

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The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

et al. 2018

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A better understanding of intraplate deformation requires the knowledge of the space–time scales involved in its development and to decipher possible links with the dynamic evolution of the plate boundaries. Central Iran provides an ideal test site to approach this scientific issue, since it is characterised by a prolonged history of Mesozoic–Cenozoic intraplate deformation that has been interfering with the spatio‐temporal re‐organization of the Zagros convergence zone along the Eurasia plate boundary. This study focus on the Doruneh Fault (DF) region that is considered as the northern mechanical boundary of the Central East Iranian Microcontinent. By combining field investigations with apatite low‐temperature thermochronology, we present a revised tectono‐stratigraphic scenario for the DF region, typified by a punctuated history of fault‐related exhumation, burial and cooling history back to the Upper Cretaceous. When framed at regional scale, these results attest that the Zagros convergence zone, and its hinterland domain were fully mechanically coupled since ca. 40–35 Ma, a time lapse that is here referred as to the onset of continental collision along the Arabia–Eurasia plate boundary. In this scenario, the DF region operated throughout the Cenozoic as a major zone of residual stress accommodation and transfer in the hinterland domain of the Zagros convergence zone. Results of this study also suggest that the tectonic evolution along the Arabia–Eurasia plate boundary was modulated by the plate‐boundary dynamics and by the modes of tectonic reactivation of the intracontinental weak zones of Central Iran and at its tectonic boundaries.

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Section: Stratigraphy Of the Doruneh Fault Regionmentioning

confidence: 99%

Section: Syn-breakup Units (Upper Cretaceous)mentioning

confidence: 99%

The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

et al. 2018

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“…According to faunal assemblage and microfacies characteristic, the paleoenvironment is referred to semi-restricted lagoon. This microfacies was recorded from Central Iran before by Amirshahkarami and Karavan (2016). There is significant evidence for the gradual continuation and intensity of tectonic movements and a gradual growth of chemical deposits in shallow depressions and development of conditions leading to the Sachun Formation.…”

Section: Paleoenvironment and Tectono-sedimentarymentioning

confidence: 63%

Biostratigraphy, facies analysis and sequence stratigraphy of the Sachun Formation (Interior Fars, Zagros, SW of Iran)

Karimi

Afghah

Ghetmiri

et al. 2020

Carbonates Evaporites

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Two sections of the Maastrichtian–Lower Eocene Sachun Formation, crossing Interior Fars zone, Zagros basin in SW Iran, were selected. To biostratigraphy, facies analysis, paleoenvironment and sequence stratigraphy, foraminifers and lithofacies were studied. Three foraminifer assemblage zones were observed in the studied areas. According to stratigraphic distribution of the identified foraminifers, the Sachun Formation is assigned to Upper Cretaceous (Maastrichtian)—Lower Eocene (Ypersian) age. The sedimentation of the Sachun Formation was controlled by the sea-level fluctuation. According to the sedimentary records, Sachun Formation has been deposited in a tectonically unstable basin. Microscopic investigation confirms the presence of seven microfacies, which can be grouped into four depositional environments: tidal flat, lagoon, shoal, and open marine. A carbonate shallow shelf is suggested for the depositional environment of the Sachun Formation, with the depth of sedimentary basin of the Sachun Formation decreasing from the study area to the south of Fars zone. Sachun Formation facies have been deposited in a shallow depositional basin characterized by permanent sea level changes. The vertical distribution of the investigated lithofacies supports two third-order cyclic sequences in the Sachun Formation, based on shallowing upward patterns in the determined lithofacies.

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“…Generally, the Oligocene and Miocene deposits of the Qom Formation in central Iran consist mainly of limestone, marl, gypsum, and subordinate siliciclastic sediments containing diverse fossil invertebrates represented by corals, gastropods, echinoids, bivalves (particularly pectinids), and coralline red algae (Seyrafian and Toraby, 2005;Reuter et al, 2009;Yazdi et al, 2012;Rahiminejad et al, 2020). These unconformably overlie the continental rocks of the Lower Red Formation (Oligocene) and are unconformably overlain by the Middle to Upper Miocene continental strata of the Upper Red Formation (Stöcklin and Setudehina, 1991;Yazdi-Moghadam, 2011;Amirshahkarami and Karavan, 2015;Rahiminejad et al, 2020). The depositional environments of the Qom Formation in the Esfahan-Sirjan Basin are consistent with mixed carbonate-siliciclastic homoclinal ramp (Reuter et al, 2009), open shelf (SE Chahriseh (Moradi, 2012)), and inner and middle ramps Vartun section (Rahiminejad et al, 2020).…”

Section: Geological Settingmentioning

confidence: 99%

Paleoecology of Lower Miocene coralline red algae-rich grainstone facies in the Qom Formation (Vartun section, central Iran)

Rahiminejad¹,

Yazdi²,

Ghosh³

2022

BSGM

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In this paleoecological study we focused on coralline red algae-rich shoal grainstone facies in the Lower Miocene (Aquitanian) carbonates of the Qom Formation in the Vartun section in central Iran. The identified coralline red algae are mainly non-geniculate, although very rare geniculate forms of corallines were also recognized in thin section analysis. The identified algae are represented by Melobesioideae (Lithothamnion cf. valens, Lithothamnion cf. rovereoti, Lithothamnion cf. peleense, and Lithothamnion spp.), Mastophoroideae (Neogoniolithon sp., Spongites spp., and Spongites cf. fruticulosus), Sporolithon spp. (Sporolithon spp. and Sporolithon cf. airoldii), and geniculate coralline (Corallina). The algal taxa mainly display fruticose and lumpy growth forms. The dominance of the former is consistent with high water energy in the identified shoal environment. The presence of Lower Miocene algae indicates that deposition of carbonates took place in warm tropical to subtropical waters in a euphotic marine environment during the Aquitanian. Likewise, high water energy and sediment agitation resulted in taphonomic features such as fragmentation, abrasion, and disarticulation.

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Microfacies models and sequence stratigraphic architecture of the Oligocene–Miocene Qom Formation, south of Qom City, Iran

Cited by 18 publications

References 29 publications

The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

The long‐term evolution of the Doruneh Fault region (Central Iran): A key to understanding the spatio‐temporal tectonic evolution in the hinterland of the Zagros convergence zone

Biostratigraphy, facies analysis and sequence stratigraphy of the Sachun Formation (Interior Fars, Zagros, SW of Iran)

Paleoecology of Lower Miocene coralline red algae-rich grainstone facies in the Qom Formation (Vartun section, central Iran)

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