Albitization evidences of Mesozoic carbonates: petrological  study of authigenic albites in the northwest of the Bortziriak Cinco Villas Massif, eastern Basque-Cantabrian Basin

Martin Ladron de Guevara Aguirreche; Arantxa Bodego; Eneko Iriarte

doi:10.55407/geogaceta98190

Albitization evidences of Mesozoic carbonates: petrological study of authigenic albites in the northwest of the Bortziriak Cinco Villas Massif, eastern Basque-Cantabrian Basin

Authors

Martin Ladron de Guevara Aguirreche Geologia Saila, Zientzia eta Teknologia Fakultatea, Euskal Herriko Unibertsitatea, Leioa, Bizkaia.
Arantxa Bodego Geologia Saila, Zientzia eta Teknologia Fakultatea, Euskal Herriko Unibertsitatea, Leioa, Bizkaia. https://orcid.org/0000-0003-1825-4239
Eneko Iriarte Departamento de Historia, Geografía y Comunicación, Universidad de Burgos. https://orcid.org/0000-0001-8365-5616

DOI:

https://doi.org/10.55407/geogaceta98190

Keywords:

diagenesis, albitization, mesozoic carbonates, rifting, Basque-Cantabrian Basin

Abstract

The presence of authigenic Na-feldspars in sedimentary carbonate rocks is unusual and its origin is controversial in terms of genesis and timing. The use of optical microscopy, cathodoluminescence and in situ semi-quantitative EDX analysis techniques, has allowed the identification and characterization of authigenic albite crystals in the Mesozoic pre- and syn-rift carbonates of the northwestern margin of the Bortziriak-Cinco Villas Massif, in the northeastern Basque-Cantabrian Basin (western Pyrenees). The euhedral habit, crystal size, spatial distribution and crosscutting relationships, together with the pure albitic composition, suggest a relatively early replacement origin. Compaction of sediments during burial, besides possible fluid migration linked to the intense syn-rift halokinetic activity, may have been decisive for the mobilisation of cations, and hence, for the albitization of the carbonate rocks.

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Panorámica de Los Pirineos (foto portada)

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Published

2023-12-18

How to Cite

Ladron de Guevara Aguirreche, M., Bodego, A., & Iriarte, E. (2023). Albitization evidences of Mesozoic carbonates: petrological study of authigenic albites in the northwest of the Bortziriak Cinco Villas Massif, eastern Basque-Cantabrian Basin. GEOGACETA, 74, 31–34. https://doi.org/10.55407/geogaceta98190

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Vol. 74 (2023): July-December

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