Tectonic escape of a crustal fragment during the closure of the Rheic Ocean: U–Pb detrital zircon data from the Late Palaeozoic Pulo do Lobo and South Portuguese zones, southern Iberia

Braid, James A.; Murphy, J. Brendan; Quesada, Cecilio; Mortensen, J. K.

doi:10.1144/0016-76492010-104

Cited by 105 publications

(98 citation statements)

References 65 publications

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“…The age of these units is not well constrained, the Pulo do Lobo Formation, based on U-Pb zircon ages (Braid et al 2011) is suggested to be middle-late(?) Silurian to middle Devonian in age.…”

Section: Geologic Settingmentioning

confidence: 99%

“…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%

“…From a paleogeographic point of view it has been suggested that the PQG and the VSC were situated at the eastern margin of the Avalonia plate (Oliveira and Quesada 1998;Ribeiro et al 2007) or that they have affinities with the Meguma terrane (Braid et al 2011) before their integration in the Variscan Chain following the Rheic Ocean closure and culmination of the amalgamation of the Pangea supercontinent by the collision between Gondwana and Laurussia during the late Palaeozoic.…”

Section: Stratigraphymentioning

confidence: 99%

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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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Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Stratigraphymentioning

confidence: 99%

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Introduction and Geological Setting of the Iberian Pyrite Belt

Inverno

Montes

Rosa

et al. 2015

Mineral Resource Reviews

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“…3), which contains the BejaAcebuches ophiolite and is widely interpreted as an accretionary complex associated with the closure of the Rheic Ocean between the South Portuguese and Ossa Morena zones in the Late Devonian-early Carboniferous (e.g. Eden 1991;Braid et al 2011). The South Portuguese Zone lies outboard of the Rheic suture and is generally considered Avalonian (e.g.…”

Section: Introductionmentioning

confidence: 99%

Does the Meguma Terrane Extend into SW England?

Nance

Neace

Braid

et al. 2015

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“…Therefore, the analysis of age populations of detrital zircon grains is connn only used to constrain the maximum depositional age and provenance of metasedimentary rocks, and its role as a geooy namic tracer is currently gaining importance (e.g. Braid et al 2011;DIos! et al 2011;Zhu et al 2011).…”

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confidence: 99%

U–Pb detrital zircon analysis of the lower allochthon of NW Iberia: age constraints, provenance and links with the Variscan mobile belt and Gondwanan cratons

Fernández

Catalán

Arenas

et al. 2012

JGS

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Detrital U-Pb laser ablation inductively coupled plasma mass spectrometry zircon ages from six siliciclastic samples from the lower allochthon of N\V Iberia are analysed to constrain their maximum sedi mentation age and provenance, and to evaluate the connections to the adjacent tectonostratigraphic domains. Deposited in the external sections of the Gondwana platform, their maximum depositional age is latest Neo proterozoic (c. 560Ma). Comparison of the age populations of the lower allochthon with those of the rest of the allochthonous and autochthonous units of NW Iberia suggests that the terranes located in the footwall of the Variscan suture should not be considered as exotic elements, but as contiguous pieces of the same conti nental margin transported onto the adjacent Gondwana mainland in Variscan times. The data are in agreement with the regional trend defined by the drop in Early Neoproterozoic and Mesoproterozoic zircon content upward in the tectonic pile, which had been previously proposed as a marrer of proximity to the eastern part of the West African Craton. Based on the age spectra, the palaeoposition for the time of sedimentation is placed in northern Africa, between the West African and Saharan cratons. Particular attention is paid to the occurr ence of an Early Neoproterozoic input, probably derived from the Pan-African Hoggar suture.Detennining the age and provenance of sedimentary rocks provides hints to place the processes that affected the Earth's crust in time and space. Access to such information in mobile belts surrOll llding stable cratons is limited by the fact that these belts usually are involved in active plate boundaries, where both defonnation and metamorphism blur some of the age (fossils) and palaeogeographical (palaeomagnetism) indicators. Zircon is a connn on constituent of most sedimentary rocks, and it is very resistant and largely survives metamorphism and defonnation.

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Tectonic escape of a crustal fragment during the closure of the Rheic Ocean: U–Pb detrital zircon data from the Late Palaeozoic Pulo do Lobo and South Portuguese zones, southern Iberia

Abstract: The Pulo do Lobo

Cited by 105 publications

References 65 publications

Introduction and Geological Setting of the Iberian Pyrite Belt

Introduction and Geological Setting of the Iberian Pyrite Belt

Does the Meguma Terrane Extend into SW England?

U–Pb detrital zircon analysis of the lower allochthon of NW Iberia: age constraints, provenance and links with the Variscan mobile belt and Gondwanan cratons

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