%0 Journal Article
%A Santisteban Navarro, Juan Ignacio
%A Dabrio González, Cristino José
%A Mediavilla López, Rosa María
%T Influencia del substrato sobre la arquitectura y característicastexturales de los sistemas fluviales: Desarrollo de paleovalles ysu relleno
%D 1996
%@ 0213-683X
%U https://hdl.handle.net/20.500.14352/56792
%X Oligocene sedimentation into SW border of Duero Basin (Spain) took place in a tectonically activebasin margino Close examination of these deposits and their relations to paleotopography reveals astrong interaction between the degree of valley incision, i.e. paleovalley development, and architectureof the deposits. Uplift of the margin basin coupled to differences in the erosionability of the substratumof (future) river valleys led to inhomogeneus response along the river beds that resulted inpaleotopographical constraints for the inciding sedimentary systems. Hard-rocks in the substratumconditioned the development of narrow, usually deeply-incised, paleovalleys. By contrast, cut areaswhere the substratum consisted of soft rocks allowed the development of wider, shallower valleys. Therelativelly-narrow passageways cut into areas with hard substratum filled up with coarse sedimentsrelated to hyperconcentrated flows, whereas the wider valleys cut into softer terrains contain welldifferentiatedfiner-grained channel-floodplain deposits. The clase concordance between hydrologicalequations and field observations confirms that textural and architectural features are strongly dependenton the morphological setting.
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