Publication: Campos de dunas y mantos eólicos de Tierra de Pinares (Sureste de la cuenca del Duero, España)
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2005
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Instituto Geológico y Minero de España
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Abstract
Se describe la distribución espacial y características geomorfológicas de los mantos eólicos y campos de dunas del sureste de la cuenca del Duero. Los campos de dunas más significativos en los que se centra el estudio son seis: La Parrilla, Montemayor de Pililla, Arévalo, Mudrián, Sanchonuño-Lastras de Cuéllar y Cantalejo. En los campos de dunas, los vientos del oeste y suroeste fueron los constructores de las diferentes morfologías dunares, entre las que destacan las dunas parabólicas, tanto simples como compuestas, estas últimas formadas principalmente por unión de formas simples. El predominio de los mantos eólicos y de las dunas parabólicas indica el papel activo de una cubierta vegetal abierta en la formación del sistema eólico. Las nuevas dataciones de depositos dunares realizadas por termoluminiscencia (TL) indican que el desarrollo dunar se habría producido fundamentalmente durante el intervalo 12,6-9 ka BP, correspondiente al evento frío y árido del Dryas reciente y al Holoceno temprano. También se han puesto en evidencia las diferencias texturales y en las dimensiones de los cuerpos dunares entre los depósitos eólicos de las zonas de campiña y los páramos. Finalmente, en la parte oriental de Tierra de Pinares, existen procesos eólicos actuales con formación de ripples, nebkhas y blowouts, así como caras de avalancha esporádicamente activas. El cambio climático, los incendios forestales y el uso intensivo de vehículos todoterreno constituyen los mayores riesgos de desestabilización de los depósitos eólicos de la cuenca del Duero.
The paper describes the spatial distribution and geomorphologycal characteristics of the aeolian sand-sheets and dunefields in southeast of Duero basin. Six significative dunefields were selected to study: La Parrilla, Montemayor de Pililla, Arévalo, Mudrián, Sanchonuño-Lastras de Cuéllar and Cantalejo. The dune forms of studied dunefields were created by western and southwestern winds. Simple and compound parabolic dunes predominate, the last ones formed by union of simple dunes. The predominance of sand sheets and parabolic dunes indicate the active role of open vegetation cover in the eolian system formation. The new luminescence (TL) data of dune deposits indicate that the main dune development occurred between 12,6 and 9 ka BP, that is, during the cold and arid Younger Dryas episode and the late Holocene. Evidences on different texture and dune body size between lowlands and highlands aeolian sediments are given too. Finally, in the eastern zone of the system, aeolian processes occur at the present with ripples, nebkhas and blowout formation, active sporadically slipfaces are present too. The main risks of destabilization of eolian sediments are constituted by climate change, fire, and the use of four-wheel drive vehicles.
The paper describes the spatial distribution and geomorphologycal characteristics of the aeolian sand-sheets and dunefields in southeast of Duero basin. Six significative dunefields were selected to study: La Parrilla, Montemayor de Pililla, Arévalo, Mudrián, Sanchonuño-Lastras de Cuéllar and Cantalejo. The dune forms of studied dunefields were created by western and southwestern winds. Simple and compound parabolic dunes predominate, the last ones formed by union of simple dunes. The predominance of sand sheets and parabolic dunes indicate the active role of open vegetation cover in the eolian system formation. The new luminescence (TL) data of dune deposits indicate that the main dune development occurred between 12,6 and 9 ka BP, that is, during the cold and arid Younger Dryas episode and the late Holocene. Evidences on different texture and dune body size between lowlands and highlands aeolian sediments are given too. Finally, in the eastern zone of the system, aeolian processes occur at the present with ripples, nebkhas and blowout formation, active sporadically slipfaces are present too. The main risks of destabilization of eolian sediments are constituted by climate change, fire, and the use of four-wheel drive vehicles.