Late glacial and post-glacial deposits of the Navamuño peatbog (Iberian Central System): Chronology and paleoenvironmental implications



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Turu, Valenti and Carrasco González, Rosa María and Pedraza Gilsanz, Javier de and Ros, Xavier and Ruiz-Zapata, María Blanca and Soriano-López, Joan Manuel and Mur-Cacuho, Elena and Pélachs-Mañosa, Albert and Muñoz Martín, Alfonso and Sánchez, Jesús and Echeverria-Moreno, Anna (2018) Late glacial and post-glacial deposits of the Navamuño peatbog (Iberian Central System): Chronology and paleoenvironmental implications. Quaternary International, 470 . pp. 82-95. ISSN ISSN: 1040-6182

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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.

Item Type:Article
Uncontrolled Keywords:Paleoclimate, Sedimentary charcoals, Deglaciation, Geochemistry, LOI, Iberian Central System
Subjects:Sciences > Geology > Soil science
Sciences > Geology > Geodynamics
Sciences > Geology > Stratigraphic geology
Sciences > Geology > Paleontology
ID Code:48016
Deposited On:11 Jun 2018 18:04
Last Modified:12 Jun 2018 07:46

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