Volcanismo Retiense y Sinemuriense inferior en el extremo occidental de la Cuenca Vasco-Cantábrica

  1. F. Sarrionandia 1
  2. M. Carracedo 1
  3. L. Eguiluz 1
  4. J.F. Mediato 2
  5. X. Solé 2
  6. P.P. Hernáiz 2
  7. C. Peropadre 2
  8. F. Moreno 2
  9. E Larrondo 2
  1. 1 Universidad del País Vasco/Euskal Herriko Unibertsitatea
    info

    Universidad del País Vasco/Euskal Herriko Unibertsitatea

    Lejona, España

    ROR https://ror.org/000xsnr85

  2. 2 INYPSA, Informes y Proyectos, S.A.
Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2012

Issue Title: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.

Issue: 13

Pages: 253-256

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

In the northern edge of the Santander Coastal Block and in the southern areas of the Cabuerniga Platform we have recognized volcanic levels composed by ash and lapilli tuffs interbedded in the Imon (Rhaetian) and Villanueva de Puerta (Lower Sinemurian) carbonate formations. In these thin volcanic beds (ca. 3 m in the Rhaetian and 38 cm in the Lower Sinemurian), the 30%-40% of the clasts components are of juvenile origin with varied compositions (rhyolites, trachytes, diabases, spilitized ultramafic rocks), which are included in an essentially micritic matrix with visible crystal fragments of quartz, feldspar, and altered mafic minerals. According to textural and compositional characteristics it can be deduced that it was a shallow submarine explosive magmatism, probably of alkaline or moderately alkaline nature and of hydrovolcanic type. Possibly, N-S trending paleozoic basement fractures controlled the eruptive focuses, showing the importance of this fracture system during the permo-triassic rift process, and being probably active until Lower Sinemurian.

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