Late glacial and post-glacial deposits of the Navamuno peatbog (Iberian Central System): Chronology and paleoenvironmental implications
| Autor: | Alfonso Muñoz-Martín, Jesús Sánchez, Anna Echeverria-Moreno, Joan Manuel Soriano-López, Rosa M. Carrasco, Valenti Turu, Javier Pedraza, Albert Pélachs-Mañosa, Xavier Ros, Elena Mur-Cacuho, Blanca Ruiz-Zapata |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), Govern d'Andorra, Soriano, Joan Manuel, Pèlachs, A., Muñoz-Martín, A., Echeverria, A., Soriano, Joan Manuel [0000-0002-0333-8635], Pèlachs, A. [0000-0002-8075-1044], Muñoz-Martín, A. [0000-0002-5302-5119], Echeverria, A. [0000-0002-8192-8534] |
| Rok vydání: | 2017 |
| Předmět: |
010506 paleontology
Geodinámica 010504 meteorology & atmospheric sciences Pleistocene Paleoclimate Older Dryas 01 natural sciences Paleontology Sedimentary charcoals Deglaciation LOI Iberian Central System Geología Glacial period Younger Dryas Holocene 0105 earth and related environmental sciences Earth-Surface Processes geography geography.geographical_feature_category Geochemistry Moraine Glaciolacustrine deposits Geology |
| Zdroj: | E-Prints Complutense. Archivo Institucional de la UCM instname Digital.CSIC. Repositorio Institucional del CSIC E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid |
| Popis: | The Navamuño peatbog (Sierra de Béjar, western Spain) is a ∼14 ha pseudo-endorheic depression with boundaries defined by a lateral moraine of the Cuerpo de Hombre paleoglacier and fault-line scarps on granite bedrock. The stratigraphy of the Navamuño peatbog system is characterized here using borehole data to a depth of 20 m. An integrated interpretation from direct-push coring, dynamic probing boreholes and handheld auger drillings advances our knowledge of the Navamuño polygenetic infill. Correlating this data with those obtained in other studies of the chronology and evolutionary sequence of the Cuerpo de Hombre paleoglacier has enabled us to establish the sequence of the hydrological system in the Navamuño depression. During the Late Pleistocene (MIS2), the depression was dammed by the Cuerpo de Hombre glacier and fed by its lateral meltwaters, and was filled with glaciolacustrine deposits. The onset of the Holocene in Navamuño is linked to a flat, fluviotorrential plain with episodes of local shallow pond/peat bog sedimentation. This evolutionary sequence is congruent with the age model obtained from available radiocarbon dating, obtaining 19 ages from ∼800 cal yr BP (at depth 1.11 m) to ∼16800 cal yr BP (at depth 15.90–16.0 m). Finally, the sedimentary record enabled interpretation of the environmental changes occurring in this zone during the late glacial (from the Older Dryas to the Younger Dryas) and postglacial (Holocene) stages, placing them within the paleoclimatic context of the Iberian Peninsula and Mediterranean regions. This work was supported by the Spanish Ministry of Economy and Competitiveness (Projects CGL2013-44076-P and CGL2016-78380-P). The authors also wish to acknowledge the help and assistance of the Regional Environment Department (JCyL) and the Local Authority in the village of Candelario. Valenti Turu acknowledges grant ATC013 -and- 2015/2016 from the Government of Andorra. |
| Databáze: | OpenAIRE |
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