000161036 001__ 161036
000161036 005__ 20251017144556.0
000161036 0247_ $$2doi$$a10.1016/j.sedgeo.2025.106899
000161036 0248_ $$2sideral$$a144262
000161036 037__ $$aART-2025-144262
000161036 041__ $$aeng
000161036 100__ $$aLarena, Zuriñe
000161036 245__ $$aGastropod-rich lacustrine carbonate deposits in N Iberia: a depositional, climatic and ecological record of the Late Miocene
000161036 260__ $$c2025
000161036 5060_ $$aAccess copy available to the general public$$fUnrestricted
000161036 5203_ $$aThe Tortonian Peña Adrian Formation represents the youngest depositional unit of the Miranda-Trebiño basin (Basque-Cantabrian Pyrenees), which developed on the Southern Basque-Cantabrian Pyrenees from late Eocene to Late Miocene times. The formation is a 50–160 m thick succession of alluvial detrital grading to lacustrine carbonates that contain rich and varied calcareous fossil biota (gastropods, ostracods and charophytes). The fossil association characterizes warm temperate, shallow lakes with vegetated bottoms and well‑oxygenated and alkaline fresh waters. Integration of stratigraphic, sedimentological, paleontological and Csingle bondO stable isotopic data allows the differentiation of a wide range of sedimentary facies, the construction of a depositional model and the definition of distinct evolutionary phases and relation to allogenic processes. Up to 3 metre-thick facies sequences record repetitive water-level changes, likely reflecting short-term climate changes. Overall, the succession outlines an asymmetric cycle of gradual expansion and faster contraction of a shallow ramp-like lake system evolving under oscillating climatic conditions. C and O stable isotopes are consistent with decreasing salinity and increasing precipitation/evaporation balance trough time. Excellent preservation of aragonitic and bimineralic gastropods characterizes the open lacustrine deposits, whereas shell dissolution and neomorphism are distinct in the palustrine ones. This contrasting degree of preservation of calcareous biota clearly reflects changes in the physico-chemical conditions that prevailed during sedimentation and early burial. The findings add to the knowledge of carbonate lake basins, help discern the factors that controlled their evolution and highlight specific depositional and preservation conditions for gastropod-rich carbonate records.
000161036 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
000161036 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000161036 700__ $$0(orcid)0000-0002-4212-0524$$aArenas, Concha$$uUniversidad de Zaragoza
000161036 700__ $$aSanjuan, Josep
000161036 700__ $$aPascual, Ana
000161036 700__ $$aLarraz, Mariano
000161036 700__ $$aMurelaga, Xabier
000161036 700__ $$aBaceta, Juan Ignacio
000161036 7102_ $$12000$$2280$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Estratigrafía
000161036 773__ $$g483 (2025), 106899 [23 pp.]$$pSediment. geol.$$tSedimentary Geology$$x0037-0738
000161036 8564_ $$s1781308$$uhttps://zaguan.unizar.es/record/161036/files/texto_completo.pdf$$yVersión publicada
000161036 8564_ $$s2580228$$uhttps://zaguan.unizar.es/record/161036/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000161036 909CO $$ooai:zaguan.unizar.es:161036$$particulos$$pdriver
000161036 951__ $$a2025-10-17-14:13:15
000161036 980__ $$aARTICLE