Oncolitos continentales en el Campaniense superior de la Cuenca de Montalbán (Allueva Fm, Cordillera Ibérica)

Diego Torromé; Marcos Aurell

doi:10.55407/geogaceta100284

Upper Campanian continental oncolites in the Montalbán subbasin (Allueva Fm, Iberian Chain)

Authors

Diego Torromé Departamento de Ciencias de la Tierra-IUCA, Universidad de Zaragoza https://orcid.org/0000-0002-5101-5777
Marcos Aurell Departamento de Ciencias de la Tierra-IUCA, Universidad de Zaragoza https://orcid.org/0000-0002-2430-7424

DOI:

https://doi.org/10.55407/geogaceta100284

Keywords:

oncoid, isotopes δ18O δ13C, Cretaceous, Allueva, alluvial

Abstract

This study focuses on the analysis of the oncolites found in the Allueva Fm, an uppermost Cretaceous (middle-upper Campanian) alluvial unit deposited during the initial stages of development of the compressional Montalbán Subbasin (Iberian Chain). Successive oncolitic levels are found in the upper part of the formation, westwards the locality of Fonfría (northern Teruel province). There, the 45 m-thick succession logged consists of an association of oncolitic limestones, mudstones and marlstones. Oncoid sampling has been done for petrographic description and isotopic analysis. Oncoids are accumulated in up to 1 m-thick lenticular levels, and show spherical to elliptical shapes with sizes ranging between 1 and 15 cm, the smallest being oncoids dominant. Oncoid lamination is concentrical with almost no irregularities (SS-C oncoids), indicating constant movement. A preliminary isotopic study performed of successive oncoid laminations is coherent with a fresh-water environment with sub-humid climatic conditions.

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Topografía del detal del cráter Gusev (Marte)

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Published

2024-06-29

How to Cite

Torromé, D., & Aurell, M. (2024). Upper Campanian continental oncolites in the Montalbán subbasin (Allueva Fm, Iberian Chain). GEOGACETA, 75, 3–6. https://doi.org/10.55407/geogaceta100284

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Vol. 75 (2024): January-June

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