Geomorphological evolution of the Tilcara alluvial fan (Jujuy Province, NW Argentina): Tectonic implications and palaeoenvironmental considerations

Sancho, Carlos; Peña, José Luis; Rivelli, Felipe; Rhodes, E.; Muñoz, Arsenio

doi:10.1016/j.jsames.2008.03.005

Cited by 36 publications

(20 citation statements)

References 21 publications

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“…The bottom of the valley is occupied by the Santa María River and its floodplain. The regional geomorphology is similar to that of other arid regions in Northwest Argentina (Maldonado, Neder, & Sampietro Vattuone, 2014;May, 2008;May, Zech, Schellenberger, Jull, & Veit, 2011;Peña-Monné et al, 2015;Sancho, Peña-Monné, Rivelli, Rhodes, & Muñoz, 2008).…”

Section: Introductionsupporting

confidence: 62%

Geomorphology of the alluvial fans in Colalao del Valle-Quilmes area (Santa María Valley, Tucumán Province, Argentina)

Peña-Monné

Vattuone

2016

Journal of Maps

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The geomorphological map of the alluvial fans in the Colalao del Valle-Quilmes area represents the first detailed map of the Santa María Valley, Northwest Argentina. The map was made using photointerpretation of aerial photographs and Google Earth images. The initial working scale was 1:10,000 and then reduced to 1:27,000 to fit ISO A1 size. Final drawings were produced using FreeHand 11. The area is characterized by the presence of coalescent alluvial fans developed on four levels. These fans end at the floodplain of the Santa María River. Sand mantles and dunes are present in this area, with old channels of the main river forming abandoned wetlands. A Holocene fault affects the distal area of some fans, whilst the apices of several alluvial fans have archaeological settlements. This study area presents an excellent example of regional Holocene evolution. Recent and present fluvial dynamics, aeolian activity, and the Holocene fault show high geomorphological activity. As a consequence, the information contained in the geomorphological map may be relevant to the establishment of risk areas for human settlements. Moreover, the map could be useful for planning conservation measures for the Prehispanic villages.ARTICLE HISTORY

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Section: Introductionsupporting

confidence: 62%

Geomorphology of the alluvial fans in Colalao del Valle-Quilmes area (Santa María Valley, Tucumán Province, Argentina)

Peña-Monné

Vattuone

2016

Journal of Maps

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“…Three major units have previously been described: the Maimará Formation (Salfity et al ., ), the Uquía Formation (Castellanos, ; Marshall et al ., ; Walther et al ., ) and thick conglomeratic fills of Quaternary age (Tchilinguirian & Pereyra, ; Robinson et al ., ; Strecker et al ., ; Sancho et al ., ). In the following sections, we will refine this stratigraphic framework for the southern part of the Humahuaca Basin and focus our attention on its distinct volcanic ash‐bearing conglomerates and sandstones that document sustained deposition, deformation and erosion in the basin, and which provide excellent stratigraphic markers to assess the late Cenozoic basin evolution.…”

Section: Regional and Geological Settingmentioning

confidence: 97%

Neotectonic basin and landscape evolution in the Eastern Cordillera of NW Argentina, Humahuaca Basin (~24°S)

et al. 2013

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The intermontane Quebrada de Humahuaca Basin (Humahuaca Basin) in the Eastern Cordillera of the southern Central Andes of NW Argentina (23°-24°S) records the evolution of a formerly contiguous foreland-basin setting to an intermontane depositional environment during the late stages of Cenozoic Andean mountain building. This basin has been and continues to be subject to shortening and surface uplift, which has resulted in the establishment of an orographic barrier for easterly sourced moisture-bearing winds along its eastern margin, followed by leeward aridification. We present new U-Pb zircon ages and palaeocurrent reconstructions suggesting that from at least 6 Ma until 4.2 Ma, the Humahuaca Basin was an integral part of a largely contiguous depositional system that became progressively decoupled from the foreland as deformation migrated eastward. The Humahuaca Basin experienced multiple cycles of severed hydrological conditions and subsequent re-captured drainage, fluvial connectivity with the foreland and sediment evacuation. Depositional and structural relationships among faults, regional unconformities and deformed landforms reveal a general pattern of intrabasin deformation that appears to be associated with different cycles of alluviation and basin excavation in which deformation is focused on basin-internal structures during or subsequent to phases of large-scale sediment removal.

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“…Vertical autogenic processes can result in fan segmentation and terracing, and thus stratigraphic architectures similar to those produced by an imbalance between sediment supply and transport potential, commonly attributed to climatic change or hinterland tectonics (e.g. Heward, ; Wasson, ; Harvey, ; Ritter et al ., ; Viseras et al ., ; Singh & Tandon, ; Sancho et al ., ). The regular, vertical stacking of laterally homogeneous sedimentary units observed in fan successions of endorheic basins stands in sharp contrast to the variously incised and inset geometries of alluvial‐fan deposits in other kinds of basins (Fig.…”

Section: Discussionmentioning

confidence: 97%

Autogenic dynamics of alluvial fans in endorheic basins: Outcrop examples and stratigraphic significance

Ventra

Nichols

2013

Sedimentology

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Alluvial fans are relatively simple depositional systems, due to the direct coupling of sediment sources and adjacent accumulation areas. Nonetheless, general models of alluvial-fan evolution and stratigraphy remain elusive, due to the great sensitivity of such systems to allogenic controls and their strongly case-specific responses. Autogenic processes intrinsic to alluvial-fan dynamics can complicate stratigraphic architectures, with effects not easily distinguishable from those of allogenic forcing. A distinction is made here between lateral autogenic dynamics, tied to spatial sediment distribution over fan surfaces, and vertical autogenic dynamics, related to independent incision-aggradation cycles. Autogenic mechanisms have been highlighted recently by modelling studies, but remain poorly constrained in field-based studies. Examples are presented here from the margins of the Cenozoic Teruel and Ebro basins (Spain), where alluvial fans accumulated thick successions during phases of basin topographic closure and endorheic drainage which promoted forced aggradation. Fan successions consist of conformable architectures of stacked clastic sheets, laterally continuous and with no evidence of internal unconformities, inset architectures, fan segmentation or preserved incised channels. Continuous aggradation in these closed basins strongly inhibited 'vertical' autogenic dynamics in the form of fan head and through fan incision, due to the forced rise in geomorphic base level and the creation of positive accommodation. Furthermore, the lack of incised channels favoured widespread sediment transport and aggradation over broad fan sectors in relatively short time spans, in contrast to the typical occurrence of active lobes and abandoned fan surfaces caused by 'lateral' autogenic dynamics. Stratigraphic records of alluvial fans developed in endorheic basins are essentially complete and largely unaffected by autogenic processes. The latter characteristic implies that they can be more unambiguously interpreted in terms of allogenic forcing, because stratigraphic signatures are not complicated by the effects of complex fan autodynamics.

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Geomorphological evolution of the Tilcara alluvial fan (Jujuy Province, NW Argentina): Tectonic implications and palaeoenvironmental considerations

Cited by 36 publications

References 21 publications

Geomorphology of the alluvial fans in Colalao del Valle-Quilmes area (Santa María Valley, Tucumán Province, Argentina)

Geomorphology of the alluvial fans in Colalao del Valle-Quilmes area (Santa María Valley, Tucumán Province, Argentina)

Neotectonic basin and landscape evolution in the Eastern Cordillera of NW Argentina, Humahuaca Basin (~24°S)

Autogenic dynamics of alluvial fans in endorheic basins: Outcrop examples and stratigraphic significance

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