Publication: Análisis sedimentológico de los conglomerados de Tariego (Unidad 4, Neógeno de la depresión del Duero)
Loading...
Full text at PDC
Publication Date
1989
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad de Salamanca
Citations
Exportar
Abstract
Los conglomerados de Tariego registran varios mecanismos de depósito de gravas en canales fluviales. A partir de estudios muy detallados de la geometría y relaciones laterales de facies y estructuras sedimentarias primarias, se pueden diferenciar tres tramos. El inferior con facies Gt representa el relleno de un canal por megaripple. En el intermedio, estudiado con detalle en este trabajo, se reconoce un episodio inferior con Gp/Sp debido a la migración de barras en un canal
muy poco sinuoso ("recto") y otro superior, con superficies de acreción lateral y rellenos de Gp y Sp, interpretado como depósitos de barras de meandro (point bar) en un sistema meandriforme de baja sinuosidad. El tercer tramo (superior) corresponde a un episodio simple de acreción lateral de una barra de meandro.
The Tariego conglomerates record several mechanisms of deposition of gravel in fluvial channels. From detailed studies of geometries, lateral and vertical facies relationships and primary sedimentary structures three members were differentiated. The lower Gt-dominated member represents a -channel filled up with gravel moved by megaripples. Two depositional episodes are dislinguished in he inteimediate member (the one studied in detail in this paper); the lower one made up of Gp/Sp facies records downcurrent migration of gravelly bars in a low-sinuosity ("straight") channel; ¡he upper episode, with large-scale epsilon cross stratification (lateral accretion) and fills of Gp and Sp, is interpreted as point bar deposits of a low-sinuosity fluvial system. The uppennost member was deposited by a single point bar of a meandering river.
The Tariego conglomerates record several mechanisms of deposition of gravel in fluvial channels. From detailed studies of geometries, lateral and vertical facies relationships and primary sedimentary structures three members were differentiated. The lower Gt-dominated member represents a -channel filled up with gravel moved by megaripples. Two depositional episodes are dislinguished in he inteimediate member (the one studied in detail in this paper); the lower one made up of Gp/Sp facies records downcurrent migration of gravelly bars in a low-sinuosity ("straight") channel; ¡he upper episode, with large-scale epsilon cross stratification (lateral accretion) and fills of Gp and Sp, is interpreted as point bar deposits of a low-sinuosity fluvial system. The uppennost member was deposited by a single point bar of a meandering river.