Relación entre oxidación anaeróbica del metano y chimeneas de carbonatos autigénicos del Golfo de Cádizevidencias mineralógicas, geoquímicas y petrológicas

  1. R. Merinero 1
  2. Rosario Lunar Hernández 1
  3. Luis Somoza 2
  4. César Menor Salván 3
  5. Marta Ruiz Bermejo 3
  6. Víctor Díaz del Río Español 4
  7. Jesús Martínez Frías 3
  1. 1 Departamento de Cristalografía y Mineralogía, Universidad Complutense de Madrid
  2. 2 División de Geología Marina, IGME
  3. 3 Centro de Astrobiología (CSIC-INTA).
  4. 4 Centro Oceanográfico de Málaga, Instituto Español de Oceanografía
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2008

Issue Title: VII Congreso Geológico de España

Issue: 10

Pages: 981-984

Type: Article

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Abstract

From mineralogical, geochemical and petrological data of authigenic carbonates chimneys of the Gulf of Cadiz, we are established the relation between methane, and more specifically the anaerobic oxidation of methane inner of sediments, and the formation of chimneys. The mineralogical composition of chimneys (rich Fe dolomite and ankerite), presence of iron sulphides and pseudomorf oxyhydroxides with framboidal texture, the δ13C values (-9.24‰ y -38.36‰), the organic compounds found inner of chimneys (n-alkanes with n<20 and the regular isoprenoids crocetane, pristane and phytane) and the microfabrics of carbonates (pelloids, pellets, clotted carbonates and spherical nodules of carbonate) indicate a close relation between anaerobic oxidation of methane and the formation of the chimneys.

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