δ13C and δ18O-based interpretation of Miocene carbonates of the Miranda-Trebiño basin, NE Iberia:  preliminary insights

Zuriñe Larena; Concha Arenas; Xabier Murelaga; Juan Ignacio Baceta

doi:10.55407/geogaceta104481

δ13C and δ18O-based interpretation of Miocene carbonates of the Miranda-Trebiño basin, NE Iberia: preliminary insights

Authors

Zuriñe Larena Departamento de Geología, Facultad de Ciencia y Tecnología, Euskal Herriko Unibertsitatea UPV/EHU, Bilbao
Concha Arenas Departamento de Ciencias de la Tierra, Universidad de Zaragoza - Institute for Research on Environmental Sciences of Aragón (IUCA) and GeoTransfer Group
Xabier Murelaga Departamento de Geología, Facultad de Ciencia y Tecnología, Euskal Herriko Unibertsitatea UPV/EHU, Bilbao
Juan Ignacio Baceta Departamento de Geología, Facultad de Ciencia y Tecnología, Euskal Herriko Unibertsitatea UPV/EHU, Bilbao

DOI:

https://doi.org/10.55407/geogaceta104481

Keywords:

d13C, d18O, lacustrine-palustrine, carbonates, climate, hydrology

Abstract

The stable isotopes (C and O), bulk mineralogy and sedimentary facies types of the Miocene lacustrine palustrine carbonates of the Cucho Section (Miranda-Trebiño basin, N Iberia) are studied. The results indicate deposition in a freshwater carbonate lake recording significant biogenic CO₂ input, changing Precipitation/Evaporation rates and variations in vegetation cover and pedogenesis on palustrine areas. Short-lived stages of higher salinity and evaporative conditions are recorded by the relative abundance of fine-grained dolomite. The highest δ¹³C values suggest ¹²C sequestration in anoxic bottom waters due to water column stratification. These new data support the general deepening trend of the lake system established from previous sedimentological analyses.

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Published

2024-12-02

How to Cite

Larena, Z., Arenas, C., Murelaga, X., & Baceta, J. I. (2024). δ13C and δ18O-based interpretation of Miocene carbonates of the Miranda-Trebiño basin, NE Iberia: preliminary insights. GEOGACETA, 76, 19–22. https://doi.org/10.55407/geogaceta104481

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