Santisteban, Juan I. and Dabrio, Cristino J. and Mediavilla López, Rosa María (1996) Influencia del substrato sobre la arquitectura y características texturales de los sistemas fluviales: Desarrollo de paleovalles y su relleno. Geogaceta, 20 (2). pp. 285-288. ISSN 0213-683X
Oligocene sedimentation into SW border of Duero Basin (Spain) took place in a tectonically active basin margino Close examination of these deposits and their relations to paleotopography reveals a strong interaction between the degree of valley incision, i.e. paleovalley development, and architecture of the deposits. Uplift of the margin basin coupled to differences in the erosionability of the substratum of (future) river valleys led to inhomogeneus response along the river beds that resulted in paleotopographical constraints for the inciding sedimentary systems. Hard-rocks in the substratum conditioned the development of narrow, usually deeply-incised, paleovalleys. By contrast, cut areas where the substratum consisted of soft rocks allowed the development of wider, shallower valleys. The relativelly-narrow passageways cut into areas with hard substratum filled up with coarse sediments related to hyperconcentrated flows, whereas the wider valleys cut into softer terrains contain welldifferentiated finer-grained channel-floodplain deposits. The clase concordance between hydrological equations and field observations confirms that textural and architectural features are strongly dependent on the morphological setting.
|Uncontrolled Keywords:||Substratum lithological inhomogeneities, Paleovalleys morphology, Spatial architectural and textural differences, Incision-infill.|
|Subjects:||Sciences > Geology > Stratigraphic geology|
|Deposited On:||07 May 2010 09:40|
|Last Modified:||15 Mar 2011 12:24|
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