A peri-Gondwanan arc in NW IberiaI: Isotopic and geochemical constraints on the origin of the arc—A sedimentary approach

Fuenlabrada, José Manuel; Arenas, Ricardo; Martı́nez, Sonia Sánchez; García, Francisco Javier Puente; Castiñeiras, Pedro

doi:10.1016/j.gr.2009.09.007

Cited by 51 publications

(28 citation statements)

References 49 publications

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“…6). Separat ed from the basal units by ophiolites, the upper units have been repeatedly interpreted as a well-preserved section of a peri Gondwanan arc (Abati et al, 2003Dlaz Garda et al, 2010;Fuenlabrada et al, 2010), what suggests that these relatively young Nd model ages are influenced by abundant supplies of juvenile mate rial generated in relation to the magmatic activity of the arc (see Fig. 7e).…”

Section: Discussionmentioning

confidence: 95%

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Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Fuenlabrada

Arenas

Fernández

et al. 2012

Lithos

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Section: Discussionmentioning

confidence: 95%

“…Moreover, Fig. 6 also includes for com parison Nd data of the uppermost greywackes of the O rdenes Complex (upper units; Fuenlabrada et aL, 2010). These Cambrian greywacl<es (maximum age of sedimentation at 530-500 Ma) have much younger model ages ranging between 1215 and 720 Ma.…”

Section: Sm-nd Isotope Systematicsmentioning

confidence: 99%

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Fuenlabrada

Arenas

Fernández

et al. 2012

Lithos

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“…At the same time, flyschoid deposits with a large input of Cambrian zircons were accumulating close to the drifting arc Fuenlabrada et al, 2010). These sediments are preserved in the Upper allochthonous units of the European Variscides, and may have been located along the more active side of the back-arc basin, attached to the arc-system.…”

Section: The Sediments Of the Upper Sequencementioning

confidence: 99%

U–Pb ages of detrital zircons from the Basal allochthonous units of NW Iberia: Provenance and paleoposition on the northern margin of Gondwana during the Neoproterozoic and Paleozoic

et al. 2010

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Keywords: NW Iberia Variscan allochthonous terranes Detrital zircons JA-ICP-MS U-Pb dating GeodynamicsLA-ICP-MS U-Ph ages of detrital zircons from eight silicic1astic samples from the Basal units of the Variscan allochthonous complexes of NW Iberia are used to establish the maximum depositional age and provenance of two tectonically-stacked metasedimentary sequences deposited on the outermost margin of Gondwana, and subsequently involved in the Rheic Ocean suture. The maximum depositionai ages for the two sequences is latest Neoproterozoicand latest Cambrian, respectively. The age spectra are also used to discuss the paleoposition of the NW Iberian basement on the continental margin ofGondwana prior to the opening of the Rheic Ocean, which is tentatively placed in northern Africa, between the West African and Saharan cratons. Based on similarities and differences with age data from the NW Iberian autochthon and other allochthonous terranes involved in the Rheic suture, the relative proportions of Mesoproterozoic zircons in both assemblages are proposed as markers of proximity to the eastern part of the West African craton during late Neoproterozoic and late Cambrian. The geodynamic processes that took place along this part ofGondwana during the late Neoproterozoic, late Cambrian and Early Ordovician are discussed in the light of the LA-ICP-MS results, as well as the sedimentological record, magmatic evolution and plate tectonic setting of NW Iberia. These processes are linked to late Neoproterozoic and Cambro-Ordovician subduction events beneath the northern Gondwanan margin.

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“…Protolith ages for the gabbros and granitoids range between 490 and 520 Ma Andonaegui et al, 2012). These units were probably part of a Cambrian peri-Gondwanan magmatic arc located in the periphery of the West African Craton, to the West of the external margin section represented by the Basal Units Fuenlabrada et al, 2010;Albert et al, 2015). The Upper Units may be divided into two groups based on metamorphic criteria.…”

Section: Terranes Incorporated Into the Variscan Suture Of Nw Iberiamentioning

confidence: 99%

Variscan ophiolites in NW Iberia: Tracking lost Paleozoic oceans and the assembly of Pangea

Arenas¹,

Martı́nez²

2015

Episodes

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A peri-Gondwanan arc in NW IberiaI: Isotopic and geochemical constraints on the origin of the arc—A sedimentary approach

Cited by 51 publications

References 49 publications

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

U–Pb ages of detrital zircons from the Basal allochthonous units of NW Iberia: Provenance and paleoposition on the northern margin of Gondwana during the Neoproterozoic and Paleozoic

Variscan ophiolites in NW Iberia: Tracking lost Paleozoic oceans and the assembly of Pangea

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