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

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The Geology of Iberia: A Geodynamic Approach

Part of the book series: Regional Geology Reviews ((RGR))

Abstract

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 “zip-like” 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.

Coordinator: T. Sánchez-García.

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Authors and Affiliations

  1. Instituto Geológico y Minero de España (IGME), Ríos Rosas 23, 28003, Madrid, Spain

    T. Sánchez-García, F. Bellido & C. Quesada

  2. Department of Earth Sciences, Faculty of Science and Technology, New University of Lisbon, Campus de Caparica, Quinta da Torre, 2829-516, Caparica, Portugal

    M. Chichorro

  3. Laboratório Nacional de Energia e Geologia (LNEG), Estrada da Portela, Bairro do Zambujal, Apartado 7586-Alfragide, 2610-999, Amadora, Portugal

    A. R. Solá & M. L. Ribeiro

  4. Instituto de Geociencias (IGEO-CSIC), Dr. Severo Ochoa 7, 28040, Madrid, Spain

    J. J. Álvaro

  5. Instituto Geológico y Minero de España (IGME), C/Azafranal 48, 37001, Salamanca, Spain

    A. Díez-Montes & E. González-Clavijo

  6. Facultad de Ciencias Geológicas, Universidad Complutense, 28040, Madrid, Spain

    C. Quesada

  7. Departamento de Geociências, Universidade de Évora, Largo dos Colegiais 2, 7000, Évora, Portugal

    J. C. Lopes

  8. Faculty of Science, Instituto Dom Luiz, University of Lisbon, Campo Grande, Edifício C8, Piso 3, 1749-016, Lisbon, Portugal

    Í. Dias da Silva

  9. Department of Geology, University of Salamanca, Plaza de la Merced s/n, 37008, Salamanca, Spain

    J. Gómez Barreiro & A. López-Carmona

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  1. T. Sánchez-García
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    Cecilio Quesada

  2. LNEG, Amadora, Portugal

    José Tomás Oliveira

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Sánchez-García, T. et al. (2019). The Cambrian-Early Ordovician Rift Stage in the Gondwanan Units of the Iberian Massif. In: Quesada, C., Oliveira, J. (eds) The Geology of Iberia: A Geodynamic Approach. Regional Geology Reviews. Springer, Cham. https://doi.org/10.1007/978-3-030-10519-8_2

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