Middle Jurassic palaeoenvironment and palaeobiogeography of the Tabas Block, Central Iran: palynological and palaeobotanical investigations

Badihagh, Mohammad Taghi; Sajjadi, Freshteh; Farmani, Taghi; Uhl, Dieter

doi:10.1007/s12549-018-0361-0

Cited by 6 publications

(6 citation statements)

References 52 publications

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“…1) on the Tabas Block was selected to investigate the palynology and palaeobotany of the Hojedk Formation. Previous studies have recorded that the formation was of Bathonian-Bajocian age, based on its stratigraphical characteristics and fossil content (Ameri et al, 2013;Ameri, 2018;Badihagh et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…The presence of minor marine palynomorphs, such as proximate dinoflagellate cysts, suggests a transgression in their studied interval. The palynological assemblages found in the Hojedk Formation indicated a diverse range of parent flora, with ferns, bryophytes and gymnosperms (including mainly conifers and ginkgophytes) being the most prevalent in descending quantitative order (Badihagh et al, 2019). By comparing these parent floras with modern plant ecology, those researchers concluded that these palynomorphs accumulated in a moist, warm climate during the Middle Jurassic.…”

Section: Comparison and Correlationmentioning

confidence: 99%

“…Both formations indicate a distinct shallowing of the depositional environments in northern and eastern central Iran prior to the Mid-Cimmerian tectonic event (Fürsich et al, 2009). Based on ammonite records for both underlying and overlying units (Badamu & Parvadeh formations, respectively) (Seyed-Emami et al, 2020) and plant macrofossils (Badihagh et al, 2019), the Hojedk Formation is generally dated as late Bajocian to early Bathonian (Badihagh et al, 2019).…”

Section: Geological Settingmentioning

confidence: 99%

“…In their study, Badihagh et al (2019) examined the palynological and palaeobotanical aspects of the Hojedk Formation. The presence of minor marine palynomorphs, such as proximate dinoflagellate cysts, suggests a transgression in their studied interval.…”

Section: Comparison and Correlationmentioning

confidence: 99%

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The Middle Jurassic (Bajocian–Bathonian) flora of the Tabas Block, central Iran

Maleki

2024

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The present study discusses the outcome of palynlogical and palaeobotanocal investigations of Middle Jurassic strata of the Tabas Block. The most commonly identified spore type is a trilete spore, Klukisporites, which accounts for 30 per cent, and the genus Ischyosporites which makes up 12 per cent of the spore collection. Plant fossils recovered from the borehole studied are indicative of a varied assemblage, starting with a diverse range of ferns and followed by Cycadophytes, Ginkgophytes and Coniferophytes. The predominance of the Lowland group in the Tabas Block during the Bajocian–Bathonian, as indicated by the Sporomorph EcoGroup (SEG) and Plant EcoGroup (PEG) models, suggests that the strata studied were laid down mainly in a lowland environment. Dinoflagellate cysts were found in locations that correspond to river and coastal ecogroups, hinting at marine influence.

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Section: Methodsmentioning

confidence: 99%

Section: Comparison and Correlationmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Comparison and Correlationmentioning

confidence: 99%

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The Middle Jurassic (Bajocian–Bathonian) flora of the Tabas Block, central Iran

Maleki

2024

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“…2014; Vaez-Javadi, 2016; Badihagh & Uhl, 2019; Badihagh et al . 2019; Khalilizadeh et al . 2019, 2022), providing important climatic and palaeoenvironmental information.…”

Section: Introductionmentioning

confidence: 99%

Depositional and thermal history of a continental, coal-bearing Middle Jurassic succession from Iran: Hojedk Formation, northern Tabas Block

SALEHI

Wilmsen²,

Zamanian³

et al. 2022

Geol. Mag.

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During the early Bajocian, a conspicuous coal-bearing siliciclastic succession was deposited in the northern Tabas Bock, which is important for understanding the regional geodynamics of the Central-East Iranian Microcontinent (CEIM) as well as for the Jurassic coal genesis in this part of Laurasia. Sedimentary facies analysis in a well-exposed section of the lower Bajocian Hojedk Formation (Kalshaneh area, northern Tabas Block) led to the recognition of ten characteristic sedimentary facies and three facies associations, representing channels with point bars and floodplains of a Bajocian meandering river system. Modal analysis indicates that the mature quartz arenites and quartzo-lithic sandstones of the Hojedk Formation originated from the erosion and recycling of older, supracrustal sedimentary rocks on the Yazd Block to the west. The coal petrography and maturity show an advanced maturation stage, whereas the great thickness of these continental strata points to a pronounced extension-related subsidence in the northern Tabas Block. The rapid rate of differential subsidence can be explained by accelerated normal block-faulting in the back-arc extensional basin of the CEIM, facing the Neotethys to the south. Compared to the thick Jurassic, the post-Jurassic strata are relatively thin and played a limited role in the thermal history of the coal in the northern Tabas Block. A relatively high geothermal gradient in the tectonically highly mobile area of the northern Tabas Block and/or heating by regionally widespread Palaeogene intrusions were most probably the key drivers of the thermal maturation of the Middle Jurassic coals.

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