Geodynamic setting and geochemical signatures of Cambrian–Ordovician rift-related igneous rocks (Ossa-Morena Zone, SW Iberia)

Sánchez-García, Teresa; Bellido, F.; Quesada, Cecilio

doi:10.1016/s0040-1951(03)00024-6

Cited by 172 publications

(131 citation statements)

References 26 publications

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“…Evidence based on stratigraphic (Linnemann et al 2000), paleontologic (McKerrow et al 2000;Fortey and Cocks 2003), paleomagnetic (Tait et al 2000), igneous (Sá nchez-García et al 2003), and tectonothermal (Martínez Catalán et al 2002) data suggest that the opening of the Rheic Ocean occurred in the Late Cambrian to Early Ordovician, while its closure took place in Devonian to Carboniferous times during the long collision between Gondwana and Laurussia that generated Pangaea. Recently, it has been proposed that the opening of the Rheic Ocean occurred by rifting along a Neoproterozoic suture (Murphy et al 2006).…”

Section: Discussion: Implications For the Opening Of The Rheic Oceanmentioning

confidence: 99%

The Vila de Cruces Ophiolite: A Remnant of the Early Rheic Ocean in the Variscan Suture of Galicia (Northwest Iberian Massif)

Arenas¹,

Catalán²,

Martı́nez³

et al. 2007

The Journal of Geology

117

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. A B S T R A C TThe Vila de Cruces ophiolite is one of the ophiolitic units involved in the Variscan suture of the northwest Iberian Massif. This ophiolite consists of a tectonically repeated succession of greenschist facies volcanic rocks, common alternations of metasediments of pelitic or siliceous character, and scarce orthogneisses, metagabbros, and serpentinites. The protolith age of a granitic orthogneiss that intruded the mafic rocks is dated at Ma (U-Pb in 497 ‫ע‬ 4 zircons). This age can be considered a reference for the generation of the ophiolite. According to their contents of some of the most immobile trace elements, the greenschist and the metagabbros are derived from basaltic magmas with compositions similar to those of island-arc tholeiites. The influence of a subduction zone in the generation of the original basaltic magmas can be deduced from the marked negative Nb anomaly observed in all the metabasic rocks of this ophiolite. The granitic orthogneisses can also be genetically related to the basic rocks because they are similar to granitic rocks generated in volcanic arcs. The Vila de Cruces ophiolite is interpreted as a suprasubduction zone ophiolite generated in Late Cambrian times, during the early stages of the opening of the Rheic Ocean. The ophiolite was probably generated in a back-arc basin developed during the first stages of the pulling apart and later drift of one or more peri-Gondwanan terranes, one of them represented by the upper allochthon of the northwest Iberian Massif.

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Section: Discussion: Implications For the Opening Of The Rheic Oceanmentioning

confidence: 99%

The Vila de Cruces Ophiolite: A Remnant of the Early Rheic Ocean in the Variscan Suture of Galicia (Northwest Iberian Massif)

Arenas¹,

Catalán²,

Martı́nez³

et al. 2007

The Journal of Geology

117

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“…These Ediacaran turbidites were deformed and metamorphosed prior to the deposition of lowermost Cambrian volcanic rocks and sandstones Eguíluz et al, 2000;Pereira & Silva, 2002;Quesada, 1990a;Sánchez-García, Bellido, & Quesada, 2003), forming the Lower Detrital Formation and coeval volcanic-sedimentary complexes Pereira et al, 2011;Sánchez-García et al, 2010). In addition, the Série Negra is locally overlain by the São Jerónimo Formation, composed of interbedded andesites, conglomerates, sandstones and shales (Liñán, 1978).…”

Section: Série Negramentioning

confidence: 99%

Potential sources of Ediacaran strata of Iberia: a review

Pereira

2014

Geodinamica Acta

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“…Los plagiogranitos de la ZSP pertenecen a una asociación plutónica TTG relacionada con un vulcanismo asociado a importantes depósitos de sulfuros masivos en la Faja Pirítica Ibérica (Díez Montes & Bellido Mulas, 2008), mientras que los plagiogranitos de la ZOM están relacionados con un magmatismo bimodal cámbrico (Sánchez-García et al, 2003, 2008a, 2010 y en algunos casos se encuentran yacimientos de Fe de afinidad IOCG asociados a ellos (Carriedo & Tornos, 2006), por lo que el estudio detallado de estos materiales plutónicos puede constituir un importante apoyo para la investigación y discriminación de los procesos magmáticos que influyen en la formación de estos tipos de yacimientos.…”

Section: Discusión Y Conclusionesunclassified

“…1) tras un proceso de acreción continental durante el Neoproterozoico, la evolución del margen norte de Gondwana comenzó en el Cámbrico Inferior con un levantamiento y erosión diferencial de antiguos segmentos del arco Cadomiense-Avaloniense (Quesada, 1991;Sánchez-García et al, 2003;Pereira et al, 2006Pereira et al, , 2008Murphy et al, 2006, entre otros). El comienzo de un proceso de extensión fue responsable del adelgazamiento cortical (Liñan & Quesada, 1990), acompañado de un ascenso térmico en el manto que desencadenó importante actividad ígnea.…”

unclassified

Caracterización geoquímica y estudio comparativo de plagiogranitos de las Zonas Surportuguesa y Ossa-Morena (SO del Macizo Ibérico, España)

Bellido¹,

Montes²,

Sánchez-García³

2010

Estud. geol.

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Introducción y contexto geológicoEn este trabajo se hace un estudio comparativo de plagiogranitos en dos zonas diferentes del Macizo Ibérico (Zonas Surportuguesa y Ossa-Morena) (figs. 1 y 2) y en dos contextos geodinámicos distintos. Uno de ellos corresponde a un evento extensional en el margen SW de Gondwana, que tuvo lugar durante el Rift Cámbrico Inferior-Ordovícico en Ossa-Morena y el otro está relacionado con una (astenospheric, lithospheric and crustal).

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Geodynamic setting and geochemical signatures of Cambrian–Ordovician rift-related igneous rocks (Ossa-Morena Zone, SW Iberia)

Cited by 172 publications

References 26 publications

The Vila de Cruces Ophiolite: A Remnant of the Early Rheic Ocean in the Variscan Suture of Galicia (Northwest Iberian Massif)

The Vila de Cruces Ophiolite: A Remnant of the Early Rheic Ocean in the Variscan Suture of Galicia (Northwest Iberian Massif)

Potential sources of Ediacaran strata of Iberia: a review

Caracterización geoquímica y estudio comparativo de plagiogranitos de las Zonas Surportuguesa y Ossa-Morena (SO del Macizo Ibérico, España)

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