Magmatic evolution in the N-Gondwana margin related to the opening of the Rheic Ocean—evidence from the Upper Parautochthon of the Galicia-Trás-os-Montes Zone and from the Central Iberian Zone (NW Iberian Massif)

Silva, Ícaro Días da; Fernández, Rubén Díez; Montes, Alejandro Díez; Clavijo, Emílio González; Foster, David A.

doi:10.1007/s00531-015-1232-9

Cited by 40 publications

(16 citation statements)

References 123 publications

(172 reference statements)

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“…These silicic rocks have been associated with the 67 onset of rifting and the formation of migmatites and a core-complex setting in the middle crust (e.g., 68 3 Fernández et al, 2008, Díez Montes et al, 2010 Silva et al, 2014Silva et al, , 2015. 73…”

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confidence: 99%

“…The analysis of the Cambro-Ordovician magmatism in the Iberian Massif 61 is essential to properly understand the building of the arc and its bearing on the inception of the 62 Rheic Ocean. This widespread magmatism along the northern Gondwana margin comprises rift-63 related mafic rocks: continental tholeiites (Murphy et al, 2008) and N-MORB, E-MORB and OIB 64 basalts (Sánchez-García et al, 2010), alkaline to peralkaline granites (Pin et al, 1992; Díez 65 Fernández et al, 2012b, 2015, and silicic peraluminous volcanic and plutonic rocks (e.g., 66Fernández et al, 2008, Díez Montes et al, 2010. These silicic rocks have been associated with the 67 onset of rifting and the formation of migmatites and a core-complex setting in the middle crust (e.g., 68 3 Fernández et al, 2008, Díez Montes et al, 2010 Silva et al, 2014Silva et al, , 2015.…”

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Tracing the Cambro-Ordovician ferrosilicic to calc-alkaline magmatic association in Iberia by in situ U–Pb SHRIMP zircon geochronology (Gredos massif, Spanish Central System batholith)

et al. 2016

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18 U-Pb geochronological study of zircons from nodular granites and Qtz-diorites comprising part of 19Variscan high-grade metamorphic complexes in Gredos massif (Spanish Central System batholith) 20 points out the significant presence of Cambro-Ordovician protoliths among the Variscan migmatitic 21 rocks that host the Late Carboniferous intrusive granitoids. Indeed, the studied zone was affected by 22 two contrasted tectono-magmatic episodes, Carboniferous (Variscan) and Cambro-Ordovician. The European Variscan Chain resulted from the closure of the Rheic Ocean and the ensuing 50 collision of Gondwana and Laurussia (Matte, 1991; Martínez Catalán et al., 2007, Nance et al., 51 2010. In NW Iberian Massif, several allochthonous complexes are thrust onto parautochthonous 52 and autochthonous terranes (western part of the European Variscan Chain; e.g., Martínez Catalán et 53 al., 2002). These terranes belong to the North-Gondwana margin (e.g., Martínez Catalán et al., 54 2002Catalán et al., 54 , 2007 Abati et al., 2007; Díez Fernández et al., 2010, 2012a. The pre-Variscan Paleozoic 55 evolution of this tectonic realm includes the formation of a Cambro-Ordovician peri-Gondwanan 56 magmatic arc presumably linked to the subduction of the Iapetus-Tornquist Ocean, and 57 simultaneous opening of the Rheic Ocean triggered by back-arc extension and rifting (e.g., van 58 Staal et al., 1998; Abati et al., 1999 Abati et al., , 2007 Winchester et al., 2002; Stampfli and Borel, 2002; 59 Fernández-Suárez et al., 2003; Fuenlabrada et al., 2010; Sánchez Martínez et al., 2012; Díez 60 Fernández et al., 2012b). The analysis of the Cambro-Ordovician magmatism in the Iberian Massif 61 is essential to properly understand the building of the arc and its bearing on the inception of the 62 Rheic Ocean. This widespread magmatism along the northern Gondwana margin comprises rift-63 related mafic rocks: continental tholeiites (Murphy et al., 2008) and N-MORB, E-MORB and OIB 64 basalts (Sánchez-García et al., 2010), alkaline to peralkaline granites (Pin et al., 1992; Díez 65 Fernández et al., 2012b, 2015, and silicic peraluminous volcanic and plutonic rocks (e.g., 66Fernández et al., 2008, Díez Montes et al., 2010. These silicic rocks have been associated with the 67 onset of rifting and the formation of migmatites and a core-complex setting in the middle crust (e.g., 68 3 Fernández et al., 2008, Díez Montes et al., 2010 Silva et al., 2014Silva et al., , 2015. 73During the past decade, many Variscan metaigneous domains of the Central Iberian Zone (central 74 part of the Iberian Massif) have been ascribed to a late Cambrian to Middle Ordovician (ca. 500-75 460 Ma) long lasting magmatic event that occurred in North-Gondwana margin (Fig. 1a, Table 1): 76 1) the so-called "Ollo de Sapo" Formation (Hernández Sampelayo, 1922; Parga Pondal et al., 1964; 77 Martínez Catalán et al., 2004), the best known and most voluminous unit adscribed to Cambro-78Ordovician magmatism (Fernández et al., 2008) dated at 495...

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Tracing the Cambro-Ordovician ferrosilicic to calc-alkaline magmatic association in Iberia by in situ U–Pb SHRIMP zircon geochronology (Gredos massif, Spanish Central System batholith)

et al. 2016

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“…CC BY 4.0 License. In the parautochthon of the Galicia-Trás-os-Montes Zone, the appearance of tholeiitic and alkaline-peralkaline magmatism in the Mid Ordovician would signal the first steps toward extensional conditions (Díez Fernández et al, 2012;Dias da Silva et al, 2016). In the Montagne Noire and the Mouthoumet massifs contemporaneous tholeiitic lavas indicate a similar change in the tectonic regimen (Álvaro et al, 2016).…”

Section: Toledanian Phasementioning

confidence: 99%

“…Sánchez-García et al (2019) have proposed that the anomaly that produced the large magmatism throughout the Iberian Massif could have migrated from the rifting axis to inwards zones and the acid, peraluminous, K-rich rocks of Mid Ordovician in age should represent the initial stages of a new rifting pulse, resembling the peraluminous rocks of the Early Rift Event sensu Sánchez-García et al (2003) from the Cambrian Epoch 2 of the Ossa-Morena Rift. In the parautochthon of the Galicia-Trásos-Montes Zone, the appearance of tholeiitic and alkaline-peralkaline magmatism in the Mid Ordovician would signal the first steps toward extensional conditions (Díez Fernández et al, 2012;Dias da Silva et al, 2016). In the Montagne Noire and the Mouthoumet massifs contemporaneous tholeiitic lavas indicate a similar change in the tectonic regimen (Álvaro et al, 2016).…”

Section: Intracrustal Siliceous Meltsmentioning

confidence: 99%

Comparative geochemical study on Furongian (Toledanian) and Ordovician (Sardic) felsic magmatic events in south-western Europe

Álvaro¹,

Sánchez-García²,

Puddu³

et al. 2020

Preprint

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Abstract. A geochemical comparison of Early Palaeozoic felsic magmatic episodes throughout the south-western European margin of Gondwana is analysed. The comparison is made between (i) Furongian–Early Ordovician (Toledanian) activies recorded in the Central Iberian and Galicia-Trás-os-Montes Zones of the Iberian Massif, and (ii) Early–Late Ordovician (Sardic) activities in the eastern Pyrenees, Occitan Domain (Albigeois, Montagne Noire and Mouthoumet massifs) and Sardinia. Both phases are related to uplift and denudation of an inherited palaeorelief, and stratigraphically preserved as distinct angular discordances and paraconformities involving gaps of up to 30 m.y. The geochemical features of the Toledanian and Sardic, felsic-dominant activies point to a predominance of byproducts derived from the melting of metasedimentary rocks, rich in SiO2 and K2O and with peraluminous character. Zr / TiO2, Zr / Nb, Nb / Y and Zr vs. Ga / Al ratios, and REE and ƐNd values suggest the contemporaneity, for both phases, of two geochemical scenarios characterized by arc and extensional features evolving to distinct extensional and rifting conditions associated with the final outpouring of mafic tholeiitic-dominant lava flows. The Toledanian and Sardic phases are linked to neither metamorphism nor penetrative deformation; on the contrary, their unconformities are associated with foliation-free open folds subsequently affected by the Variscan deformation. The geochemical and structural framework precludes a subduction scenario reaching the crust in a magmatic arc to back-arc setting, but favours partial melting of sediments and/or granitoids in a continental lower crust triggered by the underplating of hot mafic magmas during extensional events related to the opening of the Rheic Ocean.

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The Cambrian-Early Ordovician Rift Stage in the Gondwanan Units of the Iberian Massif

Sánchez-García

Chichorro

Solá

et al. 2019

Regional Geology Reviews

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A rifting stage initiated the Variscan cycle in NW Gondwana, lasted from Terreneuvian to Early Ordovician times and culminated in opening of the Rheic Ocean. The result of lithospheric stretching was the development of a horst-and-graben structure in the upper crust and formation of basins with sharp variations in thickness and facies of the sedimentary infill. Emplacement of large volumes of igneous rocks, both plutonic and volcanic, accompanied this stage in three different intervals: (i) Early Igneous Event (Terreneuvian), exclusively composed of felsic peraluminous rocks associated with the formation of core complexes in the mid-upper crust; (ii) Main Igneous Event (Cambrian Series 2 to Furongian), displaying bimodal character; and iii) Late Event (Tremadocian-Floian), with mixed characteristics of the other two events and abundant peralkaline rocks. The rifting axis was initially located close to the Cadomian suture that fringed the Ossa Morena Zone. For about 60 m.y. the rifting processes initially propagated "ziplike" along the axis and then widened cratonward to affect inner parts of Gondwana, such as the Central Iberian Zone. The rift/drift transition was diachronous, starting in Iberia (Ossa Morena Zone) in the Furongian.

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Magmatic evolution in the N-Gondwana margin related to the opening of the Rheic Ocean—evidence from the Upper Parautochthon of the Galicia-Trás-os-Montes Zone and from the Central Iberian Zone (NW Iberian Massif)

Cited by 40 publications

References 123 publications

Tracing the Cambro-Ordovician ferrosilicic to calc-alkaline magmatic association in Iberia by in situ U–Pb SHRIMP zircon geochronology (Gredos massif, Spanish Central System batholith)

Tracing the Cambro-Ordovician ferrosilicic to calc-alkaline magmatic association in Iberia by in situ U–Pb SHRIMP zircon geochronology (Gredos massif, Spanish Central System batholith)

Comparative geochemical study on Furongian (Toledanian) and Ordovician (Sardic) felsic magmatic events in south-western Europe

The Cambrian-Early Ordovician Rift Stage in the Gondwanan Units of the Iberian Massif

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