Palynostratigraphy of Devonian sediments in the Zagros Basin, southern Iran

Ghavidel‐Syooki, Mohammad

doi:10.1016/s0034-6667(03)00122-2

Cited by 56 publications

(47 citation statements)

References 18 publications

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“…Some forms need further determination, best achieved by comparison of material from Australia. In this Ghavidel-syooki (1997) as Early Permian by palynological means.…”

Section: Biostratigraphic Gondwana Correlationmentioning

confidence: 92%

Recognition of southern Gondwanan palynomorphs at Gondwana's northern margin—and biostratigraphic correlation of Permian strata from SE Turkey and Australia

Stolle¹

2010

Geological Journal

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This study focuses on the palynology of Guadalupian (Middle Permian) strata of SE Turkey, especially on late Wordian and earliest Capitanian deposits, which are dated by foraminifers and can be chronostratigraphically related to the geological timescale. Herein, palynological species, such as Altitriletes densus, Cymatiosphaera gondwanensis and Praecolpatites sinuosus, previously characteristic for Pakistan, Australia and Antarctica are recorded. Therefore, the Permian biozones of marine fauna and the palynology of SE Turkey and the rest of the Arabian area and Australia are compared and correlated. This long-distance, eastern Gondwana-wide biostratigraphical correlation, conducted for the first time in the Guadalupian epoch in this study, showed that Corisaccites alutas has a similar Last Occurrence Datum in SE Turkey and in Australia. The correlation also showed that in the late Wordian a number of species were present throughout eastern Gondwana, whereas the distribution of other certain species was influenced by provincialism. Hence, it may be concluded that certain species of parent plants probably co-occurred Gondwana-wide, while the distribution of others was dependant on climate.

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“…Some forms need further determination, best achieved by comparison of material from Australia. In this Ghavidel-syooki (1997) as Early Permian by palynological means.…”

Section: Biostratigraphic Gondwana Correlationmentioning

confidence: 92%

Recognition of southern Gondwanan palynomorphs at Gondwana's northern margin—and biostratigraphic correlation of Permian strata from SE Turkey and Australia

Stolle¹

2010

Geological Journal

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“…1). The lower unconformity seems to be the result of Upper Silurian and Lower Devonian hiatuses produced by extensive erosion in the study area and exposures are produced by local folding and faulting (Ghavidel-Syooki 2003;Konert et al, 2001). The upper unconformity represents Upper Devonian hiatus which was generated by the Hercynian (Variscan) Orogeny and glaciation in Gondwana during the Carboniferous (McGillivary and Husseini, 1992;Konert et al, 2001).…”

Section: Geological Settingmentioning

confidence: 92%

“…The Zakeen Formation (the time-equivalent to the Jauf and Jubah formations in Saudi Arabia) is characterized by alternating layers of cross-stratified sandstone, conglomerate and thin lenses of mudstone in the study area. The Lower Permian (Ghavidel-Syooki 1997, 2003 Faraghan Formation (the time-equivalent to the Upper Unayzah Formation in Saudi Arabia) is dominated by cross-stratified sandstone and about 15 meters of stromatolitic dolomite near the base. The formation grades into Middle to Upper Permian Dalan carbonates (time equivalent of the Khuff Formation in Saudia Arabia).…”

Section: Geological Settingmentioning

confidence: 99%

“…Regardless of its importance in the Zagros stratigraphy, only minor information on the sedimentary petrology, depositional environment, and sequence stratigraphy of the Zakeen Formation is available. Nevertheless, detailed palynological studies have resulted in precise biozonation and age determination of the Zakeen Formation and identification of a significant hiatus (almost 80 million years) between the Zakeen and overlying Faraghan formations (Ghavidel-Syooki, 1986, 1997, 2003. This paper as part of a large project which investigates sedimentary petrology, depositional environment, and sequence stratigraphy of the Zakeen Formation in the South Zagros area (Zamanzadeh 2008), concentrates on the associations of sequence stratigraphy and major diagenetic features.…”

Section: Introductionmentioning

confidence: 99%

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Sequence stratigraphic controls on early-diagenetic carbonate cementation of shallow marine clastic sediments (the Devonian Zakeen Formation, southern Zagros, Iran)

2009

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Distribution pattern of carbonate cements of the Middle to Upper Devonian Zakeen Formation of southern Zagros, suggests a close relationship between relative sea-level changes and diagenetic processes. Ferroan dolomite cementation is closely linked to genetically related facies (parasequences, systems tracts, sequences) and/or major stratal surfaces (transgressive and maximum flooding surfaces and sequence boundaries). The cements are systematically distributed within the lowstand, transgressive and highstand systems tracts. Eogenetic ferroan dolomite cement (δ O from 1.06 to -6.00‰ VPDB and δ C from -1.23 to -4.94‰ VPDB) was developed in the form of: 1) ferroan dolomite cemented conglomerates in LST estuarine environments, 2) laterally extensive ferroan dolomite cemented sandstones in LST estuarine and TST foreshore-shoreface environments and along maximum flooding surfaces and 3) ferroan dolomite cemented nodules in LST, TST and HST foreshore-shoreface environments. Prolonged subaerial exposure of the strata, resulted from epeirogenetic movements of the Hercynian Orogeny, is considered to be responsible for cement and grains leaching and porosity development in sandstones underlying the major sequence boundary at the top of the Zakeen Formation.

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“…The High Zagros Zone (Berberian and King 1981) is characterized by the occurrence of major thrust faults and at both locations, Palaeozoic rocks are thrust over Mesozoic and Cenozoic rocks, resulting in the excellent surface exposure of the Lower Palaeozoic to Triassic succession. In terms of stratigraphy, the Faraghan Formation rests unconformably on the Zakeen Formation (Middle-Late Devonian), which in turn unconformably overlies the shaley Sarchahan Formation (Silurian) at both locations (Ghavidel-Syooki 2003). The Faraghan Formation grades up into the Middle-Upper Permian Dalan (Khuff) Formation and is dominated by cross-stratified sandstones along with minor siltstone and sandy shale beds at both sections (Figure 2).…”

Section: Geological Settingmentioning

confidence: 99%

Eogenetic dolomite cementation in lower Permian reservoir sandstones, southern Zagros, Iran

2009

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In spite of the increasing importance to hydrocarbon exploration of the Palaeozoic succession in southwest Iran (Zagros Belt), few comprehensive diagenetic studies of this interval have been carried out. This is the first study presented on the diagenetic characteristics of the Early Permian Faraghan Formation in its most representative exposures in the Zagros region. This formation is dominated by cross-stratified sandstones at outcrop, along with stromatolitic dolomite, dolomitized limestones and subordinate siltstone/sandy shales. The formation grades upward into the thick-bedded carbonates of the Late Permian Dalan Formation. Both formations are major hydrocarbon reservoirs in SW Iran and are time equivalents of the Unayzah and Khuff formations, respectively, in Saudi Arabia. The constituent facies of the Faraghan Formation represent sedimentation in a siliciclastic shallow-marine environment with foreshore (including tidal flat and numerous tidal channels), estuary, sabkha, shoreface and offshore sub-environments. In this study, the development of ferroan dolomite cements in the Faraghan Formation is investigated. Geometrically, ferroan dolomite cements occur in laterally extensive, cemented beds in conglomerates and sandstones, stratabound layers and as nodules in sandstones. Their various petrographic characteristics (such as microcrystalline nature, preservation of porosity, formation as the first diagenetic phase on the grains and their high volume) all indicate an eogenetic origin.y Oxygen isotopic signatures of the cement (À2.10 to À6.42%) are close to the proposed content for Lower Permian seawater. Development of this cement is attributed to the eogenetic environment y marked by fresh and seawater mixing. In this setting, sabkha-type dolomitic grains/lithics acted as nucleation sites facilitating dolomite cement precipitation.

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Palynostratigraphy of Devonian sediments in the Zagros Basin, southern Iran

Cited by 56 publications

References 18 publications

Recognition of southern Gondwanan palynomorphs at Gondwana's northern margin—and biostratigraphic correlation of Permian strata from SE Turkey and Australia

Recognition of southern Gondwanan palynomorphs at Gondwana's northern margin—and biostratigraphic correlation of Permian strata from SE Turkey and Australia

Sequence stratigraphic controls on early-diagenetic carbonate cementation of shallow marine clastic sediments (the Devonian Zakeen Formation, southern Zagros, Iran)

Eogenetic dolomite cementation in lower Permian reservoir sandstones, southern Zagros, Iran

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