New insights from U–Pb zircon dating of Early Ordovician magmatism on the northern Gondwana margin: The Urra Formation (SW Iberian Massif, Portugal)

Solá, Ana Rita; Pereira, M. Francisco; Williams, Ian S.; Ribeiro, Maria Luísa; Neiva, A.M.R.; Montero, P.; Беа, Ф.; Zinger, T. F.

doi:10.1016/j.tecto.2008.01.011

Cited by 78 publications

(56 citation statements)

References 31 publications

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“…The only Ordovician age (ca. 447 Ma) could be related to the Ordovician magmatism described along the Central Iberian Zone (e.g., Rubio-Ordóñez et al, 2012;Neiva et al, 2009;Solá et al, 2008;Bea et al, 2007). In general, the probability density curve of the Logrosán granite inheritances shows a broad overlap with the zircon U-Pb age distribution previously reported for the Schist Greywacke Complex ages Teixeira et al, 2011) and the Spanish Central System granitoids (Talavera et al, 2012;Teixeira et al, 2011;Gutiérrez-Alonso et al, 2003) (Fig.…”

supporting

confidence: 53%

Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone)

Chicharro

Villaseca

Valverde-Vaquero

et al. 2014

Journal of Iberian Geology

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The Variscan Orogeny produced widespread granites along the European Variscan belt. In relation to crustal thickening, post-collisional multiple Sn-bearing highly fractionated S-type leucogranites were emplaced. The Logrosán granite represents one of those granitic bodies and is the focus of this study. The Logrosán granite is located in the Central Extremadura Batholith, within the Central Iberian Zone (CIZ) and was emplaced during post kinematic stages of the Variscan Orogeny at ca. 308 Ma, as determined by combined U-Pb ID-TIMS and LA-ICPMS geochronology. The granitic body intruded the metasedimentary Schist Greywacke Complex (SGC) of Neoproterozoic age. A moderately evolved medium-to coarse-grained two mica leucogranite (Main Unit) and several highly evolved aplitic or microporphyritic units (Evolved Units) have been distinguished based on their petrography and whole rock geochemistry. Initial 87 Sr/ 86 Sr ratios vary from 0.7125 to 0.7286, whereas initial εNd shows a restricted range from -4.3 to -4.0 and εHf (t) ranges from +5.7 to -10.5 for Variscan-age zircons. Inherited zircons exhibit mostly Neoproterozoic ages and juvenile Hf-isotope composition (εHf up to +14.7) analogous to zircons from the SGC metasediments. The available geological, geochronological, geochemical and isotopic data allow us to propose partial melting of heterogeneous Neoproterozoic metasediments, similar to the outcropping SGC materials for the genesis of the Logrosán granite.Keywords: Sr-Nd isotopes, zircon Hf isotopes, fractionated S-type granites, tin granites, Iberian Variscan Belt Resumen La orogenia Varisca produjo una gran cantidad de granitos a lo largo del Cinturón Varisco Europeo. En relación con el engrosamiento cortical se emplazaron tardíamente granitos de tipo-S, muy fraccionados y ricos en Sn. El presente estudio se centra en uno de esos cuerpos graníticos, el granito de Logrosán. El plutón de Logrosán forma parte del Batolito de Extremadura Central (BEC), en la Zona Centroibérica (ZCI), y se emplazó durante las etapas tardías de la orogenia Varisca, a los ca. 308 Ma, según los datos combinados de geocronología de U-Pb por ID-TIMS y por LA-ICPMS. El cuerpo granítico intruyó los metasedimentos del Complejo Esquisto Grauváquico (CEG) de edad fundamentalmente Neoproterozoica. En el plutón se distinguen, de acuerdo a la petrografía y a la geoquímica de roca total, un leucogranito de dos micas de tamaño de grano medio-grueso moderadamente evolucionado (Main Unit) y varias unidades aplíticas o microporfídicas altamente evolucionadas (Evolved Units). Las relaciones isotópicas iniciales de 87 Sr/ 86 Sr varían de 0.7125 a 0.7286, mientras que el εNd inicial muestra un rango restringido de -4.3 a -4.0 y el εHf (t) en circones variscos oscila de +5.7 a -10.5. Los circones heredados del granito de Logrosán muestran edades principalmente Neoproterozoicas y composiciones isotópicas de Hf juveniles (εHf > +14.7), análogas a las encontradas en los circones del CEG. Los datos geológicos, geoquímicos, geocronológicos e iso...

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supporting

confidence: 53%

Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone)

Chicharro

Villaseca

Valverde-Vaquero

et al. 2014

Journal of Iberian Geology

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“…It may be related to crystalline rocks that presently crop out in several locations of western and central Iberia sedimentary rocks that lithologically resemble the PrecambrianCambrian Schist-Greywacke Complex (Talavera et al, 2012). Older Cambrian zircon may be linked to the rift-related magmatism reported in the OMZ (Oliveira et al, 1991;Solá et al, 2008;Chichorro et al, 2008).…”

Section: Main Zircon Forming Events and Sourcesmentioning

confidence: 99%

The transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources

Dinis

Fernandes

Jorge

et al. 2018

Sedimentary Geology

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Detrital zircon U-Pb geochronology data from late Carboniferous to Triassic clastic sedimentary rocks in SW Iberia were used to investigate the regional paleogeography during the transition from Pangea amalgamation to breakup. The major U-Pb zircon age peaks are middle Devonian to Carboniferous (~390-300 Ma), CambrianOrdovician (~530-440 Ma), Cryogenian-Ediacaran (~750-540 Ma), Stenian-Tonian (~1.2-0.9 Ga) and Paleoproterozoic (~2.3-1.8 Ga). Rapid exhumation of Variscan crystalline rocks at the contact between the South Portuguese zone and Ossa Morena Zone, explains the abundance of late Paleozoic ages in the upper Carboniferous-lower Permian continental successions. The U-Pb zircon data constrain the maximum depositional age of the Santa Susana Basin to c. 304 Ma and the Viar Basin to c. 297 Ma. The Triassic sequences, despite being c. 100 Ma younger than the Variscan tectonothermal events, contain low proportions of late Paleozoic zircon. The major peaks in all zircon spectra closely resemble those found in the adjacent basement rocks, indicating small source areas, mainly located near the rift shoulders. Longer travelled fluvial systems are postulated for the eastern portions of the Algarve Basin, which was closer to the westward advancing Tethys Ocean than the rift basins of West Iberia. Sequences that contain significant proportions of~1.2-0.9 Ga zircon are probably recycled from post-collisional Carboniferous-Permian continental deposits that were more extensive than those found today.

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“…In the Sarnelhas quartzites (the lower unit), the population of Ediacaran zircons is larger than the Cryogenian, whereas in the Armorican quartzites (the upper unit) the opposite is true. The distribution of detrital zircon ages of the Sarnelhas quartzite resembles those of the Ediacaran and Cambrian siliciclastic rocks of the OMZ (Pereira et al 2011(Pereira et al , 2012a, the Urra Formation (Solá et al 2008), and the Armorican quartzites from the CIZ-OMZ transition zone (Linnemann et al 2008). This suggests that the S-CIZ Cadomian basement was not exposed at the time of deposition of the Sarnelha quartzites and, therefore, the main source of detritus was probably the OMZ.…”

mentioning

confidence: 79%

“…In the CIZ-OMZ transition zone, the Lower Ordovician stratigraphy, which rests on the Cambrian and Ediacaran strata of the OMZ, includes at the base a ca. 490-480 Ma felsic volcanic-sedimentary complex (the Urra Formation; Solá et al 2008); this passes gradually upwards to arkosic sandstones, conglomerates (containing pebbles of black cherts derived from the Série Negra succession), and quartzites of the Armorican Quartzite Formation (e.g., Linnemann et al 2008).…”

mentioning

confidence: 99%

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Provenance of Cambrian–Ordovician Siliciclastic Rocks of Southwestern Iberia: Insights into the Evolution of the North Gondwana Margin

et al. 2014

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This study makes a comparison between the populations of detrital zircons of the Cambrian sandstones from the Ossa-Morena Zone (OMZ) and the Ordovician quartzites from the southern domains of the Central Iberian Zone (S-CIZ) to identify the sediment sources during the development of North Gondwana basins (southwestern Iberia). The U-Pb results obtained for the lower Cambrian sandstones of the OMZ show a remarkable similarity to the detrital zircon ages of greywackes from the underlying OMZ Ediacaran basement (the Série Negra succession). However, there is a greater proportion of Cryogenian grains in the Cambrian rocks, whose main sources are: (1) the late Cadomian magmatic arcs (Ediacaran, ca. 635-545 Ma) which also contributed to filling the late Ediacaran

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New insights from U–Pb zircon dating of Early Ordovician magmatism on the northern Gondwana margin: The Urra Formation (SW Iberian Massif, Portugal)

Cited by 78 publications

References 31 publications

Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone)

Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone)

The transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources

Provenance of Cambrian–Ordovician Siliciclastic Rocks of Southwestern Iberia: Insights into the Evolution of the North Gondwana Margin

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