Nódulos de hierro-manganesoel nuevo descubrimiento del Golfo de Cádiz

  1. Martín Rubí, Juan Antonio
  2. Somoza, Luis
  3. Lunar Hernández, Rosario
  4. Díaz del Río Español, Víctor
  5. Martínez Frías, Jesús
  6. González, Francisco Javier
Journal:
Boletín geológico y minero

ISSN: 0366-0176

Year of publication: 2006

Volume: 117

Issue: 1

Pages: 491-497

Type: Article

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Abstract

In this paper we report the first discovery and sampling of Fe-Mn nodules in the Gulf of Cádiz. Nodules collected (more than 500 samples) have been found on continental crust near muddy-gas mounds in the Guadalquivir Diapiric Ridge. The nodules recovered show a wide range of sizes and masses and tabular morphology. They are mainly formed by Fe and Mn oxyhydroxides in layers surrounding the nucleus. Nodules show great Fe abundance (37,7%) versus Mn (5,9%) and trace metals and REEs shortage with respect to the medium contents in oceanic nodules. The Fe-Mn oxyhydroxides and sulphide contained into the nodules could be related to micro-organisms activity (biomineralization process) linked to the hydrocarbons seeps.

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