Stratigraphic evidence for the Hirnantian (latest Ordovician) glaciation in the Zagros Mountains, Iran

Ghavidel‐Syooki, Mohammad; Álvaro, J. Javier; Popov, Leonid E.; Pour, Mansoureh Ghobadi; Ehsani, Mohammad H.; Suyarkova, Anna A.

doi:10.1016/j.palaeo.2011.04.011

Cited by 67 publications

(63 citation statements)

References 59 publications

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“…Their biostratigraphy and correlation were subsequently based on palynological studies (Ghavidel-Syooki 1998Ghavidel-Syooki & WinchesterSeeto 2002) and preliminary reports of graptolites (Rickards et al 2000). Recently, Ghavidel-Syooki et al (2011) have documented the presence of Hirnantian glaciogenic strata, which have been lithostratigraphically assigned to the Dargaz Formation.…”

Section: Geological Setting and Stratigraphymentioning

confidence: 99%

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Ghavidel‐Syooki¹,

Popov²,

Álvaro³

et al. 2014

Bull. Geosci.

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The Lower-Middle Ordovician sediments exposed in the Faraghan Mountains, south-eastern Zagros Ranges, represent a condensed succession of siliciclastic-dominated rocks rich in palynomorph assemblages (acritarchs and subsidiary chitinozoans) and sparse shelly concentrations bearing biostratigraphically significant brachiopods and conodonts. The Lower Ordovician Zard-Kuh Formation comprises coarse-grained siliciclastic deposits rich in Cruziana ichnofossils. The lower 80 m of the overlying Seyahou Formation, late Floian to Katian in age, form a heterolithic succession composed of black and green shales, subarkoses and silty limestones. Its lower part is punctuated by a centimetric phosphoarenite that contains lingulate brachiopods (Atansoria yaseri sp. nov.) and conodonts (Baltoniodus aff. B. triangularis Lindström and Drepanoistodus sp.) that suggest a latest Floian age. The top of the condensed phosphoarenite is marked by a considerable hiatus that ranges the Dapingian and early Darriwilian interval. Overlying the hiatus, the Seyahou Formation comprises two fossiliferous levels, the oldest dated as mid-Darriwilian with chitinozoans characteristic of the Siphonochitina formosa Zone, and the youngest of the Katian Acanthochitina barbata Zone. Mid Ordovician phosphogenesis associated with starvation, reworking, resedimentation, and the onset of distinct stratigraphic gaps was a complex process recorded throughout the Arabian margin of Gondwana. In the Zagros Ranges, maximum flooding and phosphate precipitation are suggested as the counterpart of the Helskjer Drowning Event of Baltoscandia and the third-order maximum flooding surface that punctuates the Siphonochitina formosa Zone in North Africa.•

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Section: Geological Setting and Stratigraphymentioning

confidence: 99%

Dapingian-lower Darriwilian (Ordovician) stratigraphic gap in the Faraghan Mountains, Zagros Ranges, south-eastern Iran

Ghavidel‐Syooki¹,

Popov²,

Álvaro³

et al. 2014

Bull. Geosci.

View full text Add to dashboard Cite

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“…1). Kuh-e Faraghan is the only place in Iran where a continuous transition from the Ordovician to the Silurian is documented in the lowermost part of the Sarchahan Formation (Ghavidel-Syooki et al 2011a). Biostratigraphy based on graptolites (Rickards et al 2000;Ghavidel-Syooki et al 2011a) Dagh (Popov and Cocks 2013) and in the Kerman Region (Brice 1999).…”

Section: Biostratigraphy and Correlationmentioning

confidence: 99%

“…Kuh-e Faraghan is the only place in Iran where a continuous transition from the Ordovician to the Silurian is documented in the lowermost part of the Sarchahan Formation (Ghavidel-Syooki et al 2011a). Biostratigraphy based on graptolites (Rickards et al 2000;Ghavidel-Syooki et al 2011a) Dagh (Popov and Cocks 2013) and in the Kerman Region (Brice 1999). The extensive occurrence of black graptolitic shales in the Zagros Basin, which occupied the outer margin of the Arabian sector of Gondwana through the Palaeozoic, is in sharp contrast with the Silurian successions documented elsewhere in Iran.…”

Section: Biostratigraphy and Correlationmentioning

confidence: 99%

“…1). Silurian deposits are widespread along the north-eastern margin of the Arabian Platform on the opposite side of the Main Zagros Thrust Zone, where they are represented mainly by black graptolitic shales assigned to the Sarchahan Formation of Iran (Ghavidel-Syooki et al 2011a). These black shales can be found in the subsurface through the Zagros Mountains and are the major hydrocarbon source rock for the Dalan and Kangan reservoirs (Saberi et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…These black shales can be found in the subsurface through the Zagros Mountains and are the major hydrocarbon source rock for the Dalan and Kangan reservoirs (Saberi et al 2016). The Silurian sedimentology and biostratigraphy of the Zagros Basin has been outlined in some detail by Ghavidel-Syooki et al (2011a) and Saberi et al (2016). The Alborz Mountains are often considered part of Central Iran in a broad sense, but most probably represent an isolated microplate in the early Palaeozoic (Popov et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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