Crustal evolution and recycling in the northern Arabian-Nubian Shield: New perspectives from zircon Lu–Hf and U–Pb systematics

Morag, Navot; Avigad, Dov; Gerdes, Axel; Белоусова, Е. А.; Harlavan, Yehudit

doi:10.1016/j.precamres.2011.01.004

Cited by 162 publications

(75 citation statements)

References 52 publications

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“…Detrital zircons older than ~750 Ma with positive εHf (t) values may be related to known Tonian-Cryogenian juvenile intra-oceanic arcmagmatismin the ANS associated with the closure of the Mozambique Ocean (Stern, 2002). This early arc-magmatic cycle in the ANS may also be recorded by detrital zircons from arc derived metasediments (ca 870-760 Ma) and magmatic zircons from orthogneisses as well as granitoids (ca 790-740 Ma) (Morag et al, 2011). Zircons from these early arc magmatic rocks (both granitoids and orthogneisses) have positive εHf (t) , so these could also be a source.…”

Section: Provenances Of Pre-cadomian Detrital Zirconsmentioning

confidence: 97%

“…10). The younger detrital zircons (with peak at 623 Ma) might be derived from unroofing of latestage granitic rocks from the Arabian-Nubian shield (Ali et al, 2010;Avigad et al, 2015;Morag et al, 2011). Most detrital zircons with these ages have positive εHf (t) (~+13 to +2) (Fig.…”

Section: Provenances Of Pre-cadomian Detrital Zirconsmentioning

confidence: 99%

“…10)). Morag et al (2011)) reported the Hf-isotope compositions of detrital zircons from Cambrian-Ordovician sandstones at the northern tip of the ANS, in Israel and Jordan, and suggested that the zircons of ca 1000-550Ma ages with positive epsilon Hf(t) are from the ANS itself, while those with negative values are from distant reworked Gondwana sources. Although 0.6-0.5 Ga zircons could have been derived from the ANS and other reworked continental crust in Gondwana, it is reasonable to think that the abundant Cadomian basement rocks of Iran, with both positive and negative epsilon Hf (t) values (Fig.…”

Section: Source Of Cadomian Zirconsmentioning

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: Provenances Of Pre-cadomian Detrital Zirconsmentioning

confidence: 97%

Section: Provenances Of Pre-cadomian Detrital Zirconsmentioning

confidence: 99%

Section: Source Of Cadomian Zirconsmentioning

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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“…Yet there is some evidence left (5anchez Martlnez et al, 2011 ), and some sedimentary sequences in NW Iberia contain ancient exposures (Gutierrez-Alonso et al, 2005). In addition, relicts of Early Neoproterozoic arc-related rod{s can be found along the Pan-African Hoggar megasuture (Atx:lelsalam et Cordani et al, 2003;Bea et al, 2009), and in the sedimentary cover of northern Gondwana, both in its eastern (Avigad et al, 2003;Avigad et al, 2007;Morag et al, 2011 ) and central sections (Avigad et al, in press). These domains broaden the paleoposition recently given to NW Iberia during the Late Neoproteozoic (Oiez Fernandez et al, 2010) and Lower Paleozoic (Bea et al, 201 0; Dlez Femandez et a.l., 201 0).…”

Section: A Lower Paleozoic Convection Systemmentioning

confidence: 99%

Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin

2012

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“…Most Neoproterozoic (800-650 Ma) detrital zircons from the EMC show superchondritic εHf t values overlapping with those from Neoproterozoic clastic and magmatic rocks from the Arabian-Nubian Shield ( Fig. 10; Morag et al, 2011b;Avigad et al, 2015). However, the Arabian-Nubian Shield cannot be considered as the only source of detritus for the EMC Ediacarian sediments, because 67% of the 580-650 Ma detrital zircons from the latter have clearly less radiogenic Hf isotopic compositions (ɛ Hf t from 0 to -28; …”

Section: Accepted Manuscriptmentioning

confidence: 97%

Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

Chelle-Michou¹

2017

Preprint

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The East Massif Central (EMC), France, is part of the internal zone of the Variscan belt where late Carboniferous crustal melting and orogenic collapse have largely obliterated the pre-to early-Variscan geological record. Nevertheless, parts of this history can be reconstructed by using in-situ U-Th-Pb-Lu-Hf isotopic data of texturally well-defined zircon grains from different lithological units. All the main rock units commonly described in the EMC are present in the area of Tournon and include meta-sedimentary and meta-igneous rocks of the Upper Gneiss Unit (UGU) and of the Lower Gneiss Unit (LGU), as well as cross-cuttingVariscan granitoid dikes and a heterogeneous granite coring the major Velay dome. Herein we demonstrate that the UGU and the LGU have markedly distinct zircon records. The results of this study are consistent with deposition of the protoliths of the paragneisses within a backarc basin that was located adjacent to the Arabian-Nubian shield and/or the Saharan Metacraton during the late Ediacaran and collected detritus from the Gondwana continent. At ~545 Ma some of these sedimentary rocks were affected by a first melting event that formed the protoliths of the LGU orthogneisses, those of which subsequently remelted at ca. 308 Ma to form the Velay granite-migmatite dome. Protoliths of the UGU result mainly from a bimodal rift-related magmatism at ~480 Ma, corresponding to melting of the Ediacaran sediments and depleted mantle. Zircon rims from the UGU additionally provide evidence for a metamorphic/migmatitic overprint during the Lower Carboniferous (~350-340 Ma).Finally, several generations of granite dikes of which inherited zircons display characteristics of both the UGU and the LGU were protractedly emplaced from ~322 Ma to ~308 Ma, the youngest of which being coeval with the formation of the Velay dome. Our data further show that the vast majority of crustal material ultimately involved in the Variscan orogeny, which forms the present-day basement in the EMC, was derived from a sedimentary mixture of ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T various components from the Gondwana continent deposited in Ediacaran times, with no evidence for the involvement of an older autochthonous crust.

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Crustal evolution and recycling in the northern Arabian-Nubian Shield: New perspectives from zircon Lu–Hf and U–Pb systematics

Cited by 162 publications

References 52 publications

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

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

Age constraints on Lower Paleozoic convection system: Magmatic events in the NW Iberian Gondwana margin

Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

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