South-western Duero and Ciudad Rodrigo basins: infill and dissection of a Tertiary basin

Navarro, Juan Ignacio Santisteban; Serrano, Ángel Martín; López, Rosa María Mediavilla; Dabrio, Cristino J.

doi:10.1017/cbo9780511524851.029

Cited by 3 publications

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“…In central and northern Iberia, the development of the present-day drainage network was related to the opening of formerly closed fluvial systems developed within the ancient Cenozoic basins. Headward erosion of the Atlantic fluvial systems captured the central Iberia drainage and eventually triggered a drainage reversal (Vegas and Banda, 1982;Gutierrez-Elorza and Perez-Gonzalez, 1993;Mediavilla et al, 1994;Santisteban et al, 1996aSantisteban et al, , 1996bAlonso-Zarza et al, 2002;Alonso-Gavilán et al, 2004) (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Quantification of fluvial incision in the Duero Basin (NW Iberia) from longitudinal profile analysis and terrestrial cosmogenic nuclide concentrations

et al. 2012

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Section: Introductionmentioning

confidence: 99%

Quantification of fluvial incision in the Duero Basin (NW Iberia) from longitudinal profile analysis and terrestrial cosmogenic nuclide concentrations

et al. 2012

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“…Although there is plenty of petrologic and, to a certain extent, structural information about the zone [10][11][12][13][14][15][16][17][18][19][20][21][22], little has been published about the tectonic evolution of these faults during Mesozoic and Cenozoic. The main reason is that in Palaeozoic lithologies, it is difficult to determine and to attribute the Late-Variscan and Alpine brittle deformation phases to successive tectonic events and ages.…”

Section: Introductionmentioning

confidence: 99%

Alpine paleostress reconstruction and active faulting in Western Iberia

2010

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Abstract:The study of intraplate tectonics is crucial for understanding the deformation within plates, far from active plate boundaries and associated stress transmission to the plate interiors. This paper examines the tectonic evolution of the Variscan basement at the western margin of the Cenozoic Duero basin. Located east of the Vilariça Fault System in NW Iberia, this intraplate zone is a relatively flat but elevated area with an intense NNE-SSW trending fault system and associated moderate seismicity. Although the area has played an important role in the Duero basin configuration, its Alpine to present-day tectonic evolution has not been well constrained. In order to characterize the successive paleostress fields, 1428 pairs of fault-striae were measured at 56 sites and two focal mechanisms were used. Stress inversion methods have been applied to analyze paleostress regimes. Results show the existence of three dominant maximum horizontal stress (Shmax) trends: N-S, NE-SW and E-W. Relative and absolute dating of the activated faults for each Shmax shows that the clearly predominant N-S paleostress field in the zone has been active since the Oligocene up to the present day; while a NE-SW stress field is found to have been active during the Cretaceous and an older E-W paleostress field was active in the earlier Alpine cycle (Late Triassic).

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Mapping geological stages of climate-dependent iron and clay weathering alteration on lithologically uniform sedimentary units using Thematic Mapper imagery (Tertiary Duero Basin, Spain)

Riaza¹,

López²,

Santisteban³

2000

International Journal of Remote Sensing

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Abstract. Weathering processes are responsible for slight surface mineralogical differences allowing the distinction between lithologically similar geological units using Thematic Mapper (TM) data. Two different stages throughout time of overlying iron alteration are notoriously distinctive on the imagery and laboratory spectra. Their diverse spectral behaviour follows the dominant iron hydroxide with kaolinite and carbonate crusts on the Pliocene Ochre Alteration typical of a humid warm climate, compared with the dominant nonhydratated iron oxides with smectite on the Miocene Red Alteration developed under a mediterranean dry climate. Iron materials with carbonate hinder appearance of the typical iron absorption features in the visible wavebands. Therefore, the iron weathering alteration coatings will be obscured on the imagery when it is developed on carbonate sediments or detritic sediments with carbonate cement or matrix. The presence of carbonate within the sediment as cement or alteration product decreases the overall reflectance of laboratory nonconsolidated rocks and the clay size fraction from rocks, apart from smoothing the 2200 nm absorption typical of OH-bearing minerals. The presence of carbonate cement and carbonate crusts favours the differentiation of some units. Digital mapping through image pro cessing of different series of digital data leads to a sequential masking of classes to produce a final map. The sequence of masking produces different maps which can be used as a tool to model aspects of the sedimentary basin and geological processes throughout time.

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South-western Duero and Ciudad Rodrigo basins: infill and dissection of a Tertiary basin

Cited by 3 publications

References 0 publications

Quantification of fluvial incision in the Duero Basin (NW Iberia) from longitudinal profile analysis and terrestrial cosmogenic nuclide concentrations

Quantification of fluvial incision in the Duero Basin (NW Iberia) from longitudinal profile analysis and terrestrial cosmogenic nuclide concentrations

Alpine paleostress reconstruction and active faulting in Western Iberia

Mapping geological stages of climate-dependent iron and clay weathering alteration on lithologically uniform sedimentary units using Thematic Mapper imagery (Tertiary Duero Basin, Spain)

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