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Azra Khosravichenar, Morteza Fattahi, Hamideh Amini and Hans von Suchodoletz
Fluvial sediments are valuable paleoenvironmental archives of the Quaternary. Since besides environmental factors they are also affected by local tectonics or intrinsic processes, large instead of small catchments should be studied. In drylands covering ...
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Lahoucine Chakir, Ali Aït Hssaïne, David Bridgland
Pág. 294 - 311
Morphosedimentary study of alluvial fans formed by the Wadi Beni Mhammed, on the southern piedmont of the western High-Atlas, has indicated three main generations of deposits. Their ages range from ancient (Plio-Pleistocene) to Holocene and recent format...
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Lahoucine Chakir, Ali Aït Hssaïne, David Bridgland
Pág. 294 - 311
Morphosedimentary study of alluvial fans formed by the Wadi Beni Mhammed, on the southern piedmont of the western High-Atlas, has indicated three main generations of deposits. Their ages range from ancient (Plio-Pleistocene) to Holocene and recent format...
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Roberto Bizzarri and Angela Baldanza
Pliocene (?)?early Pleistocene shallow marine deposits, varying from gravel to sand to clay, characterize the southernmost sector of the Valdichiana Basin, between Orte and Città della Pieve, across Tuscany, Umbria and Latium (Central Italy). Facies asso...
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Giovanni Martinelli, Federico Cervi, Andrea Dadomo and Gianluca Medioli
This study sums up the first estimates of the young water fraction (Fyw; here understood as the percentage proportion of groundwater passing through the well?s screen and younger than approximately 2?3 months) from groundwater collected in 75 wells from ...
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Konstantin W. Scheihing, Claudio E. Moya, Ulrich Struck, Elisabeth Lictevout and Uwe Tröger
A collection of 514 stable isotope water samples from the Atacama Desert is being reassessed geostatistically. The evaluation reveals that adjacent Andean catchments can exhibit distinct d18O and d2H value ranges in meteoric waters, despite similar sampl...
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Romina L. Lopez Steinmetz,Claudia I. Galli
Pág. 1 - 19
The environment of the Andean Puna Plateau is mostly characterized by the dominance of evaporative processes due to aridity. Since the intermittent runoff lacks the morphodynamic competence to generate the present day landscape, authors have usually cons...
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Ernst Kiefer,Mathias J. Dorr,Hillert Ibbeken,Hans-J. Gotze
Pág. 165 - 185
ABSTRACT. Alluvial fans and their catchments provide joint erosion and sedimentation regions, where exogenic mass transfer can be handled as a finite volume problem. The Arcas Fan in the Andean forearc of Northern Chile, one of the world?s largest alluvi...
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Ernst Kiefer,Mathias J. Dorr,Hillert Ibbeken,Hans-J. Gotze
Pág. 165 - 185
ABSTRACT. Alluvial fans and their catchments provide joint erosion and sedimentation regions, where exogenic mass transfer can be handled as a finite volume problem. The Arcas Fan in the Andean forearc of Northern Chile, one of the world?s largest alluvi...
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Germán Aguilar,Joseph Martinod,Matías Gallardo,Christian Sue
Pág. 1 - 21
We present a study on the glacial and paraglacial geomorphology of a Patagonian Cordillera Valley that is key to understanding evolution of the great lakes of Patagonia. 10Be cosmogenic nuclide exposure ages of ice-moulded surfaces from the Bayo River Va...
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Andres Gonzales Amaya, Gerhard Barmen and Galo Muñoz
The analysis of stable isotopes assisted in identifying that groundwater in the Punata alluvial fan is mainly recharged by heavy flash floods, and the recharge from rainfall is of less importance. In addition, the hydrochemical analysis identified the Pu...
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Beatriz Coira,Claudia I. Galli,Suzanne Mahlburg Kay,Daniel F. Stockli,Patrocinio Flores,Emilio Eveling
Pág. 208 - 237
Ash-fall tuffs of the Pliocene-Pleistocene deposits of Humahuaca and Casa Grande intermountain basins, northwestern Argentina, have been differentiated into two groups based on new geochemical and geochronological data which correspond to the tuffs of th...
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Jose Araya,Gregory P. De Pascale,Rodrigo Mardel,Sergio A. Sepúlveda
Pág. 529 - 545
Understanding the location and nature of Quaternary active crustal faults is critical to the reduction of both fault rupture and strong ground motions hazards in built environments. Recent work along the San Ramón Fault (SRF) demonstrates that crustal se...
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Marianna Farmakis-Serebryakova and Lorenz Hurni
As relief influences disposition of all the other objects displayed on maps, terrain representation plays one of the key roles in the map creation process. Originally a manual technique, relief shading creates the three-dimensional effect and allows the ...
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Manuel Martín-Martín, Francesco Guerrera and Mario Tramontana
Four main unconformities (1?4) were recognized in the sedimentary record of the Cenozoic basins of the eastern External Betic Zone (SE, Spain). They are located at different stratigraphic levels, as follows: (1) Cretaceous-Paleogene boundary, even if thi...
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Yongyong Li, Huili Gong, Lin Zhu, Xiaojuan Li
Pág. 1 - 17
Beijing is located on multiple alluvial-pluvial fans with thick Quaternary unconsolidated sediments. It has suffered serious groundwater drawdown and land subsidence due to groundwater exploitation. This study aimed to introduce geographical distribution...
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Yongyong Li, Huili Gong, Lin Zhu and Xiaojuan Li
Beijing is located on multiple alluvial-pluvial fans with thick Quaternary unconsolidated sediments. It has suffered serious groundwater drawdown and land subsidence due to groundwater exploitation. This study aimed to introduce geographical distribution...
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Luis A. Spalletti,Gonzalo D. Veiga,Juan R. Franzese
Pág. 521 - 538
The siliciclastic deposits of the Rancahué Formation (Oligocene, Aluminé Basin), formed in the eastern side of the Andean Cordillera (70ºW y 39ºS) are studied to evaluate the relationship among different depositional systems in volcanic settings and to d...
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Ricardo A. Astini,Federico Martina,Federico M. Davila
Pág. 245 - 267
In the northern part of the Argentine Precordillera, northwestern La Rioja, the Upper Paleozoic is over 4,000 m thick. Very coarse conglomerates from the basal section have not been described nor adequately interpreted. This work analyses this unit in th...
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Victor Maksaev,Francisco Munizaga,Victor Valencia,Fernando Barra
Pág. 264 - 287
New U-Pb zircon dating of volcanic intercalations in the lower conglomeratic part of the Cerrillos Formation shows that its deposition extended in time at least from 110.7±1.7 to 99.7±1.6 Ma. The significantly younger U-Pb zircon age of 69.5±1.0 Ma obtai...
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