Modelización genética de nódulos silíceos: aplicación al Devónico de Tabuenca (Cordillera Ibérica, España). I: Caracterización morfológica y composicional

F. J. Torrijo Echarri; J. Mandado Collado; M. E. Bona Artazos

doi:10.3989/egeol.05611-237

Modelización genética de nódulos silíceos: aplicación al Devónico de Tabuenca (Cordillera Ibérica, España). I: Caracterización morfológica y composicional

Authors

F. J. Torrijo Echarri Departamento de Ingeniería del Terreno. ETSICCP, U.P.V. Área de Petrología y Geoquímica. Departamento de Geología. Universidad de Zaragoza.
J. Mandado Collado Área de Petrología y Geoquímica. Departamento de Geología. Universidad de Zaragoza.
M. E. Bona Artazos Departamento de Geología y Geotecnia. Zaragoza

DOI:

https://doi.org/10.3989/egeol.05611-237

Keywords:

siliceous nodules, sedimentary geochemistry, Iberian Range, genetic model, diagenesis, Devonian, morphology of nodules

Abstract

Siliceous nodules of the Devonian deposits in the «Hoya Formation» (Tabuenca-Zaragoza) have been studied. The nodules are included in lutites, and contain quartz, opaque minerals and clays. The cement is criptocrystalline quartz. Our morphologic study reveals that these are spheres and spheroids, with a gray colour and 0.3 to 9.6 cm of diameter, and grade into the direction of stratification. This spherical morphology is the result of isotropic structure of host sediment, and it indicates a growth mechanism by diffusion and a short transport mechanism. The existence of distorted lamination indicate that its central section was cemented before its outer section, and that its growth was passive, by a mechanism of porosity-grouth filling.

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Published

2005-04-30

How to Cite

Torrijo Echarri, F. J., Mandado Collado, J., & Bona Artazos, M. E. (2005). Modelización genética de nódulos silíceos: aplicación al Devónico de Tabuenca (Cordillera Ibérica, España). I: Caracterización morfológica y composicional. Estudios Geológicos, 61(1-2), 9–23. https://doi.org/10.3989/egeol.05611-237

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Issue

Vol. 61 No. 1-2 (2005)

Section

Articles

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