Coralgal buildup in a mixed carbonate-siliciclastic succession of the upper Eocene Sant Martí Xic Formation (Orís, Vic, SE Ebro basin, Spain)
Mancini, Alessandro (Università degli Studi di Roma "La Sapienza")
Brandano, Marco (Università degli Studi di Roma "La Sapienza")
Gaglianone, Giovanni (Università degli Studi di Roma "La Sapienza")
Mannetta, Domenico (Università degli Studi di Roma "La Sapienza")
Ferràndez i Cañadell, Carles (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)

Data:	2025
Resum:	The Upper Eocene San Martí Xic Formation (Orís, Vic, SE Ebro basin, Spain) shows coralgal buildup developed in mixed carbonate siliciclastic deposits. During the upper Eocene, the sedimentation in the Orís area was strongly influenced by global and local factors associated with the Ebro Basin evolution. In particular, from the early Eocene to the Oligocene, the south-eastern margin of the Ebro Basin was affected by the uplift of the Catalan Range thrust. The central part of this zone shows the most pronounced deformation associated with a sin-sedimentary evolution of fan and delta fan depositional systems. These deposits gradually evolved into basin sedimentation with shallow water limestones and clastic sediments corresponding to the last marine event of the Ebro Basin. The stratigraphical series in Orís corresponds to two cycles. A first transgressive sedimentary cycle is characterized by floatstone to rudstone with Discocyclina and Nummulites, developed in a deeper and oligophotic environment associated with more humid conditions. The subsequent regressive cycle shows aggradational and progradational deltaic sediments with Nummulites developed in more arid conditions. Coralgal buildups occur interdigitated with these aggradational and progradational deltaic sediments. Facies analysis allows to better constraining the paleoenvironment where coralgal buildup developed, characterized by high sedimentation rate, mesotrophic conditions and turbid waters. The coralgal buildups of San Martí Xic Formation were thus influenced by both climatic changes and the local detrital input from delta fan system associated with the uplift of the Catalan Range thrust, showing the resilience of Eocene corals to climate changes and related clastic inputs.
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:	Cluster reef ; Mesotrophic conditions ; Priabonian ; Climate changes
Publicat a:	Geologica acta, Vol. 23 (2025) , p. 1-16 (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/48084
DOI: 10.1344/GeologicaActa2025.23.15

16 p, 18.7 MB

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