Ediacaran–Cambrian paleogeography and geodynamic setting of the Central Iberian Zone: Constraints from coupled U–Pb–Hf isotopes of detrital zircons

García, David Orejana; Martínez, Enrique Merino; Villaseca, Carlos; Andersen, Tom

doi:10.1016/j.precamres.2015.02.009

Cited by 58 publications

(24 citation statements)

References 84 publications

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“…Similar age-Hf isotope signature are consistently reported from basement rocks of the Arabian-Nubian Shield ( Fig. 10; Morag et al, 2011b), and from some Gondwana-derived sediments in Europe Linnemann et al, 2008;Orejana et al, 2015). This…”

Section: Accepted Manuscriptsupporting

confidence: 87%

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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Section: Accepted Manuscriptsupporting

confidence: 87%

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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“…In sharp contrast, Talavera et al (2012Talavera et al ( , 2015 and Orejana et al (2015) suggest a paleoposition close to the Sahara Metacraton and the Arabian-Nubian Shield for the autochthonous sequences of the Central Iberian Zone. Likewise, Avigad et al (2012) propose a similar paleoposition for Sardinia, on the basis of the detrital signal of quartz-arenites from the lower and middle Cambrian of SW Sardinia that bear a noticeable Grenvillian (1.0-1.1 Ga) zircon population.…”

Section: Rb-10-01mentioning

confidence: 84%

Detrital zircons from the Ordovician rocks of the Pyrenees: Geochronological constraints and provenance

et al. 2016

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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%

“…Following the assembly of the Gondwana supercontinent, which started in Cryogenian and Ediacaran time (Collins and Pisarevsky, 2005), Neoproterozoic-Early Cambrian Cadomian arc-type magmatism occurred for several thousand kilometers along the north-northeast periphery of Gondwana including Iran, Turkey and Iberia (Abbo et al, 2015;Linnemann et al, 2008Linnemann et al, , 2014Moghadam et al, 2015a;Orejana et al, 2015;Pereira et al, 2011;Ustaömer et al, 2009;Yilmaz Şahin et al, 2014). It is suggested that most peri-Gondwanan terranes along the Cadomian belt might have formed as back-arc or retro-arc basins, where sediments of Cadomian age were deposited (Nance and Murphy, 1994) (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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Ediacaran–Cambrian paleogeography and geodynamic setting of the Central Iberian Zone: Constraints from coupled U–Pb–Hf isotopes of detrital zircons

Cited by 58 publications

References 84 publications

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

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

Detrital zircons from the Ordovician rocks of the Pyrenees: Geochronological constraints and provenance

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

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