1000–580Ma crustal evolution in the northern Arabian-Nubian Shield revealed by U–Pb–Hf of detrital zircons from late Neoproterozoic sediments (Elat area, Israel)

Morag, Navot; Avigad, Dov; Gerdes, Axel; Harlavan, Yehudit

doi:10.1016/j.precamres.2012.04.009

Cited by 81 publications

(31 citation statements)

References 55 publications

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“…The 0.8-0.6 Ga age populations with juvenile Hf-isotope signatures provide evidence for transport of arraywas calculated using data from modern Mid-Oceanic Ridge basalts (Chauvel and Blichert-Toft, 2001). For comparison we plotted Hf isotope data on the magmatic and detrital zircons from other Cadomian fragments such as the Taurides (Abbo et al, 2015), Iberia-Avalonia-Armorica (Orejana et al, 2015) as well as Arabian-Nubian Shield (Morag et al, 2012). Data on the Iranian Cadomian magmatic zircons come from Moghadam et al (unpublished data) and (Balaghi Einalou et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…In recent years many attempts have focused on evaluating the relative abundance of zircon populations extracted from Late Neoproterozoic to Paleozoic sediments of northern Gondwana, including studies of Iberia (Balintoni et al, 2009;Fernandez et al, 2010;Fernandez-Suarez et al, 2014;Gutierrez-Alonso et al, 2003;Orejana et al, 2015) and the Arabian-Nubian Shield (Allen, 2007;Andresen et al, 2014;Avigad et al, 2003Avigad et al, , 2007Avigad et al, , 2012Morag et al, 2012) but rarely for Iran and the Taurides of Anatolia (Abbo et al, 2015;Horton et al, 2008;Ustaömer et al, 2012). Our results define a spectrum of detrital zircon populations that is quite similar to those already defined in other sedimentary sequences from Cadomian fragments of northern Gondwana, including SW Eurasia, N. Africa, and Arabia (Fig.…”

Section: Implications For An Early Paleozoic Reconstruction Of Iranmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Implications For An Early Paleozoic Reconstruction Of Iranmentioning

confidence: 99%

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

Moghadam

Griffin

et al. 2017

Lithos

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“…8A). The Elat Conglomerate consists of immature polymict conglomerates deposited in grabens developed on older exhumed and eroded ANS igneous-metamorphic rocks [63]. Zircon grains are dominantly stubby with subhedral to euhedral shapes; many have fine oscillatory or broad parallel zoning, suggestive of magmatic origins, and the grains were evidently derived by erosion of igneous/crystalline sources.…”

Section: Detrital Zircon Spectramentioning

confidence: 99%

“…Deposition of the conglomerate age indicates that igneous activity in the northern ANS had ceased by this 580 Ma date, followed by exhumation and erosion providing detrital material for the conglomerate. The U-Pb age spectrum of some 175 detrital zircons from the conglomerate defines two peaks at ~615 Ma and ~795 Ma, separated by a gap of about 100 million years, as well as a small scatter of ages up to 1.0 Ga [63]. Four grains have older 207 Pb/ 206 Pb ages of 1.97, 2.07, 2.12, and 2.5 Ga, and a few grains have ages between 900 and 1100 Ma.…”

Section: Detrital Zircon Spectramentioning

confidence: 99%

“…[73] is an important example of the use of δ 18 O values to track the process of supracrustal recycling in the formation of 1.0-1.1 Ga crust in northern Sinai. [63] uses negative ε Hf(t) values together with U-Pb dating of single detrital zircon grains to suggest that arc magmas in the same area were contaminated by older crustal components [63]. [49] provides a compelling hafnium isotope study of metasedimentary, metavolcanic, and granitic rocks in the Central Eastern Desert, giving insight into crustal growth in the region.…”

Section: Isotope Database and Ans Historymentioning

confidence: 99%

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An Expanding Arabian-Nubian Shield Geochronologic and Isotopic Dataset: Defining Limits and Confirming the Tectonic Setting of a Neoproterozoic Accretionary Orogen

Johnson¹

2014

TOGEOJ

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Geologic investigations of the Arabian-Nubian Shield (ANS) are supported by a valuable, expanding dataset of geochronologic ages and isotopic analyses. U-Pb zircon SIMS, TIMS, and evaporation data provide robust temporal control on depositional, volcanic, and intrusive events. Nd, Sr, O and, increasingly, Hf isotopic studies provide insights into magma sources and constraints on crustal recycling. Apart from well-established exceptions where Paleoproterozoic and Archean rocks intercalated in the ANS underwent Neoproterozoic reworking, the data elegantly confirm the Neoproterozoic age and juvenile character of the bulk of the ANS. The geochronologic and isotopic data reveal that some ANS sedimentary, volcanic, and igneous rocks contain pre-Neoproterozoic material as xenocrysts and possible glaciogenic clasts, but give no evidence that the ANS is otherwise underlain by any extensive tracts of older crust. Together with structural mapping, the expanding dataset confirms ANS boundaries where long-inferred in the west and suggests the placement of hitherto uncertain boundaries elsewhere. The suggested boundaries imply that the ANS is of a somewhat smaller size than considered in published discussions, which in turn impacts assessment of Neoproterozoic crustal growth rate. The Arabian-Nubian Shield (ANS) is an accretionary orogen at the northern end (present-day coordinates) of the East African Orogen. It is one of the largest expanses of mantle-derived, juvenile Neoproterozoic crust on Earth, underlying an area of ~2.7 x 10 6 km 2 . Its western boundary is a contact with pre-Neoproterozoic crust belonging to the Saharan Metacraton and Congo-Tanzania Craton. Farther south, the ANS is in contact with the Congo-Tanzania Craton and Mozambique Belt. A southeastern ANS margin is recognized as a contact with pre-Neoproterozoic gneiss belonging to a crustal block referred to as Azania. An eastern ANS margin, long a topic of debate, is suspected beneath Phanerozoic cover in central Arabia, and a northwestern margin with late Mesoproterozoic crust is suspected in Sinai.

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Crustal Evolution of the Egyptian Precambrian Rocks

Stern

Ali

2019

The Geology of Egypt

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1000–580Ma crustal evolution in the northern Arabian-Nubian Shield revealed by U–Pb–Hf of detrital zircons from late Neoproterozoic sediments (Elat area, Israel)

Cited by 81 publications

References 55 publications

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

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

An Expanding Arabian-Nubian Shield Geochronologic and Isotopic Dataset: Defining Limits and Confirming the Tectonic Setting of a Neoproterozoic Accretionary Orogen

Crustal Evolution of the Egyptian Precambrian Rocks

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