Palynostratigraphy and palaeogeography of the Cambro-Ordovician strata in southwest of Shahrud City (Kuh-e-Kharbash, near Deh-Molla), Central Alborz Range, northern Iran

Ghavidel‐Syooki, Mohammad

doi:10.1016/j.revpalbo.2005.07.006

Cited by 40 publications

(30 citation statements)

References 22 publications

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“…Incomplete Silurian and Carboniferous sedimentary successions scattered across Iran suggest periods of non-deposition and erosion (Ghavidel-syooki, 2006;Wendt et al, 2005), the significance of which is not yet fully understood. Despite lithological and lithostratigraphic similarities, Paleozoic strata in northern Iran (Alborz and Kopet Dagh), central Iran, and Zagros have different names (Fig.…”

Section: Geological Backgroundmentioning

confidence: 99%

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Moghadam

Griffin

et al. 2017

Lithos

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In this study we use detrital zircons to probe the Early Paleozoic history of NE Iran and evaluate the link between sediment sources and Gondwanan pre-Cadomian, Cadomian and younger events. U-Pb zircon ages and Hf isotopic compositions are reported for detrital zircons from Ordovician and Early Devonian sedimentary rocks from NE Iran.These clastic rocks are dominated by zircons with major age populations at ~2.5 Ga, ~0.8-0.6 Ga, 0.5 Ga and ~0.5-0.4 Ga as well as a minor broad peak at ~1.0 Ga. The source of 2.5 Ga detrital zircons is enigmatic; they may have been supplied from the Saharan Metacraton (or West African Craton) to the southwest or Afghanistan-Tarim to the east. The detrital zircons with age populations at 0.8-0.6 Ga probably originated from Cryogenian-Ediacaran juvenile igneous rocks of the Arabian-Nubian Shield; this inference is supported by their juvenile Hf isotopes, although some negative εHf (t) values suggest that other sources (such as the West African Craton) were also involved.The age peak at ca 0.

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Section: Geological Backgroundmentioning

confidence: 99%

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Moghadam

Griffin

et al. 2017

Lithos

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“…Similarly, although the end of the Cambrian coincides with an extinction-led turnover of acritarch species, morphological innovations from the Cambrian, particularly among genera, might well have paved the way for the rapid diversification of acritarchs during the Ordovician that can be viewed as a part of the Great Base map produced with BugPlates (Torsvik, 2009). 1 Nova Scotia, Canada ; 2 Eastern Newfoundland, Canada ; 3 County Wexford, Ireland ; 4 Wales ; 5 Belgium ; 6 Sardinia, Italy ; 7 Sierra Morena, Spain ; 8 Cantabrian Mountains, Spain Albani et al, 2006;; 9 N Algeria (Vecoli, 1996;Vecoli et al, 1999); 10 Ghadames Basin, Libya/Tunisia ; 11 Barrandian area, Czech Republic (Fatka et al, 2004); 12 Upper Silesia (Bruno-Silesia), Poland (Jachowicz, 1994;; 13 Holy Cross Mountains (Małopolska High), Poland ; 14 Central Alborz Mountain Range, Iran (Ghavidel-syooki, 2006); 15 Zagros Basin, Iran (Ghavidel-syooki and ; 16 South Australia ; 17 baltic Poland Jankauskas and Lendzion, 1992;; 18…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton dynamics from the Cambrian Explosion to the onset of the Great Ordovician Biodiversification Event: A review of Cambrian acritarch diversity

Nowak

Servais

Monnet

et al. 2015

Earth-Science Reviews

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Most early Palaeozoic acritarchs are thought to represent a part of the marine phytoplankton and so constituted a significant element at the base of the marine trophic chain during the 'Cambrian Explosion' and the subsequent 'Great Ordovician Biodiversification Event.' Cambrian acritarch occurrences have been recorded in a great number of studies. In this paper, published data on Cambrian acritarchs are assembled in order to reconstruct taxonomic diversity trends that can be compared with the biodiversity of marine invertebrates. We compile a database and calculate various diversity indices at global and regional (i.e. Gondwana or Baltica) scales. The stratigraphic bins applied are at the level of the ten Cambrian stages, or of fourteen commonly used biozones in a somewhat higher resolved scheme. Our results show marked differences between palaeogeographical regions. They also indicate limitations of the data and a potential sampling bias, as the taxonomic diversity indices of species are significantly correlated with the number of studies per stratigraphic bin. The total and normalized diversities of genera are not affected in the same way. The normalized genus diversity curves show a slow but irregular rise over the course of the Cambrian. These also are the least biased. A radiation of species and to a lesser extent of genera in the 'lower' Cambrian Series 2 appears to mirror the 'Cambrian Explosion' of metazoans. This radiation, not evident on Gondwana, is followed by a prominent low in species diversity in the upper Series 3 and lower Furongian. Highest diversities are reached globally, and on both Baltica and Gondwana, in the uppermost Cambrian Stage 10, more precisely in the Peltura trilobite Zone, preceding a substantial phase of acritarch species extinction below and at the Cambrian/Ordovician boundary. Nearly all the genera present in Stage 10 survived into the Ordovician. The forms that emerged during the Cambrian therefore became the foundation for the more rapid radiation of acritarchs during the 'Great Ordovician Biodiversification Event'.

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“…1). The Lower to Middle Ordovician sequence in Simeh-Kuh was documented in a number of publications (Ghobadi Pour 2006;Ghobadi Pour et al 2007a;Popov et al 2008Popov et al , 2009, whereas the Ordovician sequence in Deh-Molla is mainly known from publications of Ghavidel-Syooki 2006and Ghobadi Pour et al 2011a, 2011b. The Lower to Middle Ordovician sediments in Eastern Alborz were assigned traditionally to the Lashkarak Formation, as it was revised by Glaus (1965).…”

Section: Eastern Alborz Regionmentioning

confidence: 99%

Review of the Early to Mid Ordovician orthoconic cephalopods from Iran

Evans¹,

Pour²,

Попов³

2012

Bull. Geosci.

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Palynostratigraphy and palaeogeography of the Cambro-Ordovician strata in southwest of Shahrud City (Kuh-e-Kharbash, near Deh-Molla), Central Alborz Range, northern Iran

Cited by 40 publications

References 22 publications

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Early Paleozoic tectonic reconstruction of Iran: Tales from detrital zircon geochronology

Phytoplankton dynamics from the Cambrian Explosion to the onset of the Great Ordovician Biodiversification Event: A review of Cambrian acritarch diversity

Review of the Early to Mid Ordovician orthoconic cephalopods from Iran

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