Dynamics of sedimentary environments in the accelerated siltation of a reservoir: the case of Alhama de Granada, southern Spain

Viseras, César; Fernández, Juan; García‐García, Fernando; Soria, Jesús M.; Calvache, María Luisa; Jáuregui, P.

doi:10.1007/s00254-008-1231-2

Cited by 21 publications

(11 citation statements)

References 46 publications

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“…The average and minimum values of the mean gradient of debris-flow fans in Table 2 are much lower than reported from other mountains and the sedimentary ranges of the Southern Alps (Pierson, 1981;Sorriso-Valvo et al, 1998;de Scally et al, 2001;Owens, 2003, 2004;Saito and Oguchi, 2005). This is probably related to the schist bedrock of the contributing basins: several studies have noted the role of weak or highly fractured and weathered bedrock in the dynamics of sedimentary environments generally (Viseras et al, 2009) and in the generation of debris flows specifically (Jakob and Bovis, 1996;Calvache et al, 1997;Blair, 1999a;Bovis and Jakob, 1999;Crosta and Frattini, 2004;McSaveney and Davies, 2005;Saito and Oguchi, 2005). The Haast and Marlborough Group chlorite schists split easily along quartz-and mica-rich layers while also being complexly deformed at various scales (Wood, 1962;Lensen, 1963;Mortimer et al, 2008).…”

Section: Morphometric and Vegetation Cover Differences Between Fan Typescontrasting

confidence: 65%

Controls on fan depositional processes in the schist ranges of the Southern Alps, New Zealand, and implications for debris-flow hazard assessment

2010

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Section: Morphometric and Vegetation Cover Differences Between Fan Typescontrasting

confidence: 65%

Controls on fan depositional processes in the schist ranges of the Southern Alps, New Zealand, and implications for debris-flow hazard assessment

2010

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“…Following the interpretation of Viseras et al . () and Hornung et al . (), however, the ‘W‐shaped’ and ‘M‐shaped’ reflections point to a higher degree of internal organization compared with Rf4, and represent laterally amalgamated geometries associated with forms related to spillover processes (for example, levées) during debris‐flow events if channels are oversupplied with sediments.…”

Section: Lithofacies and Radar Faciesmentioning

confidence: 87%

“…Therefore, a geophysical approach based on the application of ground‐penetrating radar (GPR) techniques was pursued in this study, complemented by sedimentological outcrop analysis. Such a combined approach has rarely been undertaken in alluvial fan studies to date (Mills & Speece, ; Roberts et al ., ; Viseras et al ., ), and detailed studies on alpine alluvial fans are restricted to the lower Cheekye fan in British Columbia (Ékes & Hickin, ; Ékes & Friele, ) and to the Champagna fan in the Swiss Alps (Hornung et al ., ).…”

Section: Introductionmentioning

confidence: 99%

A combined study of radar facies, lithofacies and three‐dimensional architecture of an alpine alluvial fan (Illgraben fan, Switzerland)

2014

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Alluvial fans serve as useful archives that record the history of depositional and erosional processes in mountainous regions and thus can reveal the environmental controls that influenced their development. Economically, they play an important role as groundwater reservoirs as well as host rocks for hydrocarbons in deeply buried systems. The interpretation of these archives and the evaluation of their reservoir architecture, however, are problematic because marked heterogeneity in the distribution of sedimentary facies makes correlation difficult. This problem is compounded because the accumulated sedimentary deposits of modern unconsolidated fan systems tend to be poorly exposed and few such systems have been the focus of investigation using high-resolution subsurface analytical techniques. To overcome this limitation of standard outcrop-analogue studies, a geophysical survey of an alpine alluvial fan was performed using ground-penetrating radar to devise a scaled three-dimensional subsurface model. Radar facies were classified and calibrated to lithofacies within a fan system that provided outcropping walls and these were used to derive a three-dimensional model of the sedimentary architecture and identify evolutionary fan stages. The Illgraben fan in the Swiss Alps was selected as a case study and a network of ca 60 km sections of ground-penetrating radar was surveyed. Seven radar facies types could be distinguished, which were grouped into debris-flow deposits and stream-flow deposits. Assemblages of these radar facies types show three depositional units, which are separated by continuous, fan-wide reflectors; they were interpreted as palaeo-surfaces corresponding to episodes of sediment starvation that affected the entire fan. An overall upward decline in the proportion of debris-flow deposits from ca 50% to 15% and a corresponding increase in stream-flow deposits were identified. The uppermost depositional unit is bounded at its base by a significant incision surface up to 700 m wide, which was subsequently filled up mostly by stream-flow deposits. The pronounced palaeo-surfaces and depositional trends suggest that allocyclic controls governed the evolution of the Illgraben fan, making this fan a valuable archive from which to reconstruct past sediment fluxes and environmental change in the Alps. The results of the integrated outcrop-geophysical approach encourage similar future studies on fans to retrieve their depositional history as well as their potential reservoir properties.

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“…The uppermost subsection is the Cueva de Plácido subsection, in which the youngest deposits studied in this work crop out. It consists of gravels with mostly schist clasts, grey sands, silts and clays, corresponding (according to Viseras et al. 2009) to distal fluvial deposits of the Axial System.…”

Section: Description Of the Studied Sections And Fossil Sitesmentioning

confidence: 99%

Micromammal biostratigraphy of the Upper Miocene to lowest Pleistocene continental deposits of the Guadix basin, southern Spain

Minwer‐Barakat

García‐Alix

Suárez

et al. 2012

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Minwer‐Barakat, R., García‐Alix, A., Suárez, E.M., Freudenthal, M. & Viseras, C. 2012 xx xx: Micromammal biostratigraphy of the Upper Miocene to lowest Pleistocene continental deposits of the Guadix basin, southern Spain. Lethaia, Vol. 45, pp. 594–614. Recent study of the small mammals (rodents and insectivores) from several fossil‐bearing sites situated in the central sector of the Guadix Basin (Southern Spain) has notably increased the knowledge of the mammal assemblages that existed in Southern Iberia from the latest Miocene to the earliest Pleistocene. On the basis of this new information, we propose a biozonation for the continental deposits of the Guadix Basin, which consists of six biozones ranging in age from the late Turolian (MN13) to the early Villanyian (MN17). These biozones, defined according to the rules of the International Stratigraphical Guide, include not only the mentioned recently discovered fossil sites, but also other, previously known, localities of the basin. Finally, we integrate the described biozones in the Neogene Mammal units and the European Land Mammal Ages, correlate them with several classical mammal sites from other Iberian basins and the rest of Europe, and establish an approximate numerical age for the lower and upper limits of each biozone. □Biostratigraphy, Guadix Basin, rodents, insectivores, Upper Miocene, Pliocene, Pleistocene.

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Dynamics of sedimentary environments in the accelerated siltation of a reservoir: the case of Alhama de Granada, southern Spain

Cited by 21 publications

References 46 publications

Controls on fan depositional processes in the schist ranges of the Southern Alps, New Zealand, and implications for debris-flow hazard assessment

Controls on fan depositional processes in the schist ranges of the Southern Alps, New Zealand, and implications for debris-flow hazard assessment

A combined study of radar facies, lithofacies and three‐dimensional architecture of an alpine alluvial fan (Illgraben fan, Switzerland)

Micromammal biostratigraphy of the Upper Miocene to lowest Pleistocene continental deposits of the Guadix basin, southern Spain

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