The missing Rheic Ocean magmatic arcs: Provenance analysis of Late Paleozoic sedimentary clastic rocks of SW Iberia

Pereira, M. Francisco; Chichorro, M.; Johnston, S. T.; Gutiérrez-Alonso, Gabriel; Silva, J. B.; Linnemann, Ulf; Hofmann, Mandy; Drost, Kerstin

doi:10.1016/j.gr.2012.03.010

Cited by 95 publications

(81 citation statements)

References 54 publications

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“…A proximal provenance is also supported by several features of the age spectra (Fig. 8), such as: (1) the abundance of Cryogenian to Ediacaran zircon ages, which are very abundant in basement metapelites (Pereira et al, 2012a(Pereira et al, , 2012bBraid et al, 2011;Talavera et al, 2012;Shaw et al, 2014;Pérez-Cáceres et al, 2017); (2) the coincidence of the Paleozoic zircon population with magmatic events in the surrounding areas (Fernández-Suárez et al, 2000;Jesus et al, 2007;Azor et al, 2008;Rosa et al, 2009) and the detrital record of the upper Paleozoic basement rocks (Braid et al, 2011;Dinis et al, 2012;Pereira et al, 2012b;Pérez-Cáceres et al, 2017).…”

Section: Triassic (Early Fragmentation)mentioning

confidence: 71%

“…9). Zircon of Grenvillian age is scarce in the basement rocks that crop out in the vicinity of the studied basins, namely in the OMZ (Linnemann et al, 2008;Fernández-Suárez et al, 2014), in the Schist-Greywacke Complex (Pereira et al, 2012a;Talavera et al, 2012;Fernández-Suárez et al, 2014) and in the Ordovician "Armorican Quarztites" (Pereira et al, 2012a;Shaw et al, 2014), but is common in several Paleozoic units from NW Iberia (Fernández-Suárez et al, 2002;Martínez Catalán et al, 2004;Pastor-Galán et al, 2013;Shaw et al, 2014). The abundant Paleoproterozoic zircon and the occasional Archean zircons are most likely inherited from older Paleozoic to Precambrian Iberian metasedimentary successions that yield peaks of similar ages (Talavera et al, 2012;Pastor-Galán et al, 2013;Shaw et al, 2014;Rodrigues et al, 2015;Pérez-Cáceres et al, 2017).…”

Section: Main Zircon Forming Events and Sourcesmentioning

confidence: 97%

“…Kernel bandwidth of 25 Ma. Zircon age data for the Buçaco Basin from Dinis et al (2012) and for the "Armorican Quartzites" and the Schist-Greywacke Complex from Pereira et al (2012a). Taking into account the distribution of the upper Pennsylvanian to Lower Permian basins in Iberia and neighbouring continental blocks, and the source areas as indicated by the detrital zircon age spectra, the formation of the basins appears strongly affected by major dextral transcurrent movement between Gondwana and Laurussia and the uplift of the OMZ relative to the SPZ and, probably, of the CIZ relative to the OMZ (Fig.…”

Section: Late Carboniferous-permian (Late Amalgamation)mentioning

confidence: 99%

“…Detrital zircon geochronology has been extensively applied to the study of the provenance of Paleozoic and Precambrian sedimentary sequences on Iberia, and has helped constrain the potential contribution of these successions to Mesozoic and Cenozoic sedimentary sequences (e.g., Díez Fernández et al, 2010;Esteban et al, 2011;Pereira et al, 2012aPereira et al, , 2012bTalavera et al, 2012;Pastor-Galán et al, 2013;Fernández-Suárez et al, 2014;Shaw et al, 2014;da Silva et al, 2015;Rodrigues et al, 2015). The detrital record of syn-to post-collisional basins has provided important information on the exhumation history and the sedimentary transport systems during orogenesis (Dinis et al, 2012;Pastor-Galán et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Triassic (Early Fragmentation)mentioning

confidence: 71%

Section: Main Zircon Forming Events and Sourcesmentioning

confidence: 97%

Section: Late Carboniferous-permian (Late Amalgamation)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…These units are overlain in both limbs of the antiform by a flyschoid sequence which age ranges from the upper Frasnian to the upper Famennian . Various tectonic interpretations have been suggested for the PLD: (i) an accretionary prism in close association with a subduction zone dipping to the north below the Ossa-Morena Zone as a consequence of the Rheic Ocean closure (Munhá et al 1986a;Quesada et al 1994;Pereira et al 2006;Ribeiro et al 2007); (ii) an independent terrane ); (iii) an escaped crustal block that resulted from the Iberia indentation with Laurussia, responsible for the generation of the Ibero-Armorican arc (Braid et al 2011) and, finally, (iv) the infilling of a deep extensional basin between the SW border of the Ossa Morena Zone and the Iberian Pyrite Belt (Pereira et al 2012a). …”

Section: Geologic Settingmentioning

confidence: 99%

Introduction and Geological Setting of the Iberian Pyrite Belt

Inverno

Montes

Rosa

et al. 2015

Mineral Resource Reviews

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The 250 × 20-70 km Iberian Pyrite Belt (IPB) is a Variscan metallogenic province in SW Portugal and Spain hosting the largest concentration of massive sulphide deposits worldwide. The lowermost stratigraphic unit is the early Givetian to late Famennian-Strunian (base unknown) PhylliteQuartzite Group (PQG), with shales, quartz-sandstones, quartzwacke siltstones, minor conglomerate and limestones at the top. The PQG is overlain by the Volcanic Sedimentary Complex (VSC), of late Famennian to mid-late Visean age, with a lower part of mafic volcanic rocks, rhyolites, dacites and dark shales, hosting VHMS deposits on top (many times capped by a jasper/chert layer), and an upper part, with dark, purple and other shales and volcanogenic/volcaniclastic rocks, carrying Mn oxide deposits. The VSC is covered by the thousands of meters thick Baixo Alentejo Flysch Group of late Visean to Moscovian age. The VSC

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The elusive nature of the Rheic Ocean suture in SW Iberia

et al. 2015

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The Rheic Ocean suture resulted from pre-Carboniferous oceanic subduction followed by Late Devonian-Carboniferous Variscan collision. In SW Iberia, this suture has been classically located along the boundary between the Ossa-Morena and South Portuguese Zones based on the presence of three units: (i) a conspicuous metamafic unit (Beja-Acebuches) that crops out along this boundary and has been interpreted as a pre-Carboniferous Rheic Ocean ophiolite; (ii) a low-grade metasedimentary unit with minor mid-ocean ridge basalt-like lithologies (Pulo do Lobo unit), thought to represent a Rheic Ocean subduction-related accretionary prism; and (iii) the allochthonous Cubito-Moura unit that contains high-pressure and ophiolitic-like rocks. We report new structural and geochronological data that allow us to reinterpret the origin and internal structure of the Beja-Acebuches and the Pulo do Lobo units. Thus, both the Beja-Acebuches protoliths and the Pulo do Lobo metabasalts would have been formed in the context of an intracollisional extensional stage that interrupted the Variscan collision at early Carboniferous time, after the Rheic Ocean consumption, and the first continental collision. Later on, collision was resumed in an oblique left-lateral regime that gave way to coeval frontal (folds and thrusts) and lateral (shear zones and strike-slip faults) structures, with variable pressure-temperature conditions and space distribution along time. As a consequence of the superposition of transtension and complex transpression, the Rheic suture in SW Iberia has an obscure nearly cryptic appearance.

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The missing Rheic Ocean magmatic arcs: Provenance analysis of Late Paleozoic sedimentary clastic rocks of SW Iberia

Cited by 95 publications

References 54 publications

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

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

Introduction and Geological Setting of the Iberian Pyrite Belt

The elusive nature of the Rheic Ocean suture in SW Iberia

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