Albitization evidences of Mesozoic carbonates: petrological study of authigenic albites in the northwest of the Bortziriak Cinco Villas Massif, eastern Basque-Cantabrian Basin
| Autor: | Martin Ladron de Guevara Aguirreche, Arantxa Bodego, Eneko Iriarte |
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| Jazyk: | English<br />Spanish; Castilian |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Geogaceta, Vol 74 (2023) |
| Druh dokumentu: | article |
| ISSN: | 0213-683X 2173-6545 |
| DOI: | 10.55407/geogaceta98190 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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