Controls on carbonate deposition and microbialite formation in distal alluvial systems (Campanian, Montalbán subbasin, NE Spain)
Torromé Sanz, Diego (Universidad de Zaragoza)
Martín-Pérez, Andrea (Research Centre of the Slovenian Academy of Sciences and Arts)
Košir, Adrijan (Research Centre of the Slovenian Academy of Sciences and Arts)
Aurell, Marcos (Universidad de Zaragoza)

Títol variant:	Insights on the controls of carbonate deposition and microbialite formation in distal alluvial systems (Campanian, Iberian Basin)
Data:	2024
Resum:	The middle-upper Campanian Allueva Formation is located in the continental Montalbán subbasin (NE Spain) at the onset of the Alpine compression. This formation consists of alluvial terrigenous sediments, but it is locally dominated by carbonates and microbialites, which are the main focus of this study. Three facies associations are differentiated: (1) carbonate facies association including limestone levels with bioclastic accumulation of gastropods and charophytes, along with polygenetic carbonate breccias; (2) microbialite facies association including irregular limestone beds rich in oncoids; (3) terrigenous facies association including reddish mudstone m-thick levels with intercalations of sandstones and conglomerates. A lacustrine-palustrine environment was developed in the distal areas of an alluvial setting, which was characterized by low water level and short residence times. Isotopic data shows mean values of -4. 95‰ for both δ18O and δ13C, in the range of freshwater carbonates, supporting the proposed interpretation. Cathodoluminiscence analysis allowed the differentiation of three cement phases that suggest the evolution from vadose to phreatic conditions. The most common microbialites are found in form of oncoids forming oncolitic beds. Based on morphology, size and lamination, six different types of oncoids have been described. Furthermore, study of the lamination patterns has been carried out on the oncoids, identifying lamination cycles than can serve as tools for the interpretation of humid/dry conditions. Finally, controls on the formation of the system have been discussed, suggesting the development of a long-distance alluvial setting mainly sourced by meteoric waters and with a sub-humid climate progressively changing to more arid conditions.
Ajuts:	Agencia Estatal de Investigación PID2021-122612OB-I00
Nota:	Altres ajuts: La investigació de Diego Torromé és finançada peruna beca DGA del Departamento de Ciencia, Universidad y Sociedad del Conocimiento del gobierno de Aragón. Les contribucions de A. Košir i A. Martín Pérez tenen finançament del projecte J1-50028 de la Slovenian Research and Innnovation Agency (ARIS).
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Microbialite ; Oncoid ; Upper cretaceous ; Iberian basin ; Alluvial
Publicat a:	Geologica acta, Vol. 22 (2024) , p. 1-23 (Carbonate successions from Iberia and the Caribbean - Homage to Ramon Salas) , ISSN 1696-5728

Adreça original: https://revistes.ub.edu/index.php/GEOACTA/article/view/46990
Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/433389
DOI: 10.1344/GeologicaActa2024.22.13

23 p, 21.2 MB

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