Las tobas cuaternarias del río Añamaza (provincia de Soria, Cordillera Ibérica): aproximación cronológica.

• Autores: María Concepción Arenas Abad, Carlos Sancho Marcén, Marta Vázquez-Urbez, Gonzalo Martín Pardo Tirapu, John Hellstrom, José Eugenio Ortiz Menéndez, Trinidad de Torres Pérez-Hidalgo, María Cinta Osácar Soriano, Luis Francisco Auqué Sanz
• Localización: Geogaceta, ISSN 0213-683X, Nº. 49, 2010, págs. 51-54
• Idioma: español
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• Resumen

  • High-gradient, stepped fluvial tufa systems with dammed areas existed in the River Añamaza valley (NW Iberian Ranges, Spain) during Quaternary times. Single deposits range from a few meters to about 70 m thick, in which prograding-aggrading wedges separated by erosional surfaces exist. Several episodes of tufa formation have been distinguished by means of U-series, Amino-acid racemization and radiocarbon techniques. These correlate to MIS 8, 7, 5 and 1. The presence of MIS 9 is uncertain, as chronological data may also correspond to older stages. Most tufas in this area formed in MIS 5. Distinct tufa episodes can also be distinguished in the Holocene. These are the first chronological data presented for one of the northernmost Quaternary tufa systems in the Iberian Ranges.