Quaternary tephrochronology helps define conditioning factors and triggering mechanisms of rock avalanches in NW Argentina

Hermanns, Reginald L.; Schellenberger, Andreas

doi:10.1016/j.quaint.2007.05.002

Cited by 34 publications

(48 citation statements)

References 43 publications

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“…In the south most rock slope failures occurred on glacial oversteepened slopes in the Middle Holocene but postdate deglaciation by c. 10 kyr (Penna et al 2011). In the north most rock slope failure in valleys correlate with phases of higher precipitation and runoff in the Late Pleistocene and Holocene Hermanns & Schellenberger 2008).…”

Section: Possible Causes For Temporal Distribution Of Slope Failures mentioning

confidence: 96%

“…Previously 25 of 55 mapped deposits had been dated; this dataset was extended by Hermanns & Schellenberger (2008) to 33 dated deposits. None of the mapped rock slope failures had a source on glaciated slopes, even though alpine glaciers reached down to 4300 m above sea-level (asl) in the easternmost ranges during the Late Pleistocene (Haselton et al 2002).…”

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confidence: 99%

“…None of the mapped rock slope failures had a source on glaciated slopes, even though alpine glaciers reached down to 4300 m above sea-level (asl) in the easternmost ranges during the Late Pleistocene (Haselton et al 2002). Landslides occurred in the incised valleys mainly during periods of wetter climate; it is likely that enhanced runoff and lateral erosion of valley floors were the main causes of rock slope failures Hermanns & Schellenberger 2008). However, some large landslides apparently occurred during what are thought to have been dry phases of the Holocene.…”

mentioning

confidence: 99%

“…However, some large landslides apparently occurred during what are thought to have been dry phases of the Holocene. These exceptions occur near active faults and are interpreted to have been seismically triggered (Hermanns & Schellenberger 2008;.…”

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confidence: 99%

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³⁶ Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

Hermanns

Fauqué

Wilson

2014

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The morphology, sedimentology and mineralogy of deposits that previously had been associated with glacial advances (the Penitentes, Horcones and Almacenes drifts) were reinvestigated and dated using the terrestrial cosmogenic nuclide (TCN) 36 Cl. These results indicate that the deposits previously associated with the Horcones and Almacenes drifts are actually deposits of a rock slope failure from the southern face of Aconcagua mountain forming a debris-ice avalanche that were deposited 10 490 + 1120 years ago, while the deposits previously associated with the Penitentes drift is a rock avalanche from the Mario Ardito valley that deposited in the Las Cuevas valley 11 220 + 2020 years ago. Earlier in the Late Pleistocene a further rock-ice avalanche sourced from Aconcagua mountain and deposited in the Las Cuevas valley, predating related lake sediments with a calibrated 14 C age of 14 798-13 886 years and travertine deposits with a U-series age of 24 200 + 2000 years. In addition, three further rock-avalanche deposits were dated that sourced from Tolosa mountain, having 36 Cl mean ages of 14 740 + 1950 years, 12 090 + 1550 years and 9030 + 1410 years. No deposits of massive rock slope failures were found in those parts of the valleys that date younger, suggesting that climatic conditions at the transition from the Late Pleistocene to the Holocene, that were different from today's, caused the slopes to fail. Alternatively, the rock slope failures could have been seismically triggered. We suggest that the slope failures at the southern face of Aconcagua mountain have caused or contributed to a reorganization of glacial ice flow from Aconcagua mountain that might ultimately be the cause of the surging behaviour of the Horcones Inferior glacier today. Our results indicate that the glacial stratigraphy of this part of the Central Andes is still poorly understood and requires detailed mapping and dating.

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Section: Possible Causes For Temporal Distribution Of Slope Failures mentioning

confidence: 96%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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³⁶ Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

Hermanns

Fauqué

Wilson

2014

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“…The weighted average age of the last debris-flow deposit (101.9 ± 5.5 ka) also correlates with the Ouki event (120-98 ka). In the western Andes, other landslides have been associated with wetter climatic conditions such as the older Lluta collapse (northern Chile, 18 • S; Wörner et al, 2002), yielding a minimum age of 2.5 Ma (Strasser and Schlunegger, 2005), the Tomasiri landslide (southern Peru, 17 • 30 S), dated at 400 ka (Blard et al, 2009) and younger landslides in Argentina, which have been associated with the Minchin wet event (40-25 ka; Trauth et al, 2003;Hermanns and Schellenberger, 2008).…”

Section: Tectonic and Climatic Forcing On Chuquibamba Landslide Evolumentioning

confidence: 99%

Tectonic and climatic controls on the Chuquibamba landslide (western Andes, southern Peru)

et al. 2015

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Abstract. The contribution of landslides to the Quaternary evolution of relief is poorly documented in arid contexts. In southern Peru and northern Chile, several massive landslides disrupt the arid western Andean front. The Chuquibamba landslide, located in southern Peru, belongs to this set of large landslides. In this area, the Incapuquio fault system captures the intermittent drainage network and localizes rotational landslides. Seismic activity is significant in this region with recurrent M w 9 subduction earthquakes; however, none of the latest seismic events have triggered a major landslide. New terrestrial cosmogenic dating of the Chuquibamba landslide provides evidence that the last major gravitational mobilization of these rotational landslide deposits occurred at ∼ 102 ka, during the Ouki wet climatic event identified on the Altiplano between 120 and 98 ka. Our results suggest that wet events in the arid and fractured context of the Andean forearc induced these giant debris flows. Finally, our study highlights the role of tectonics and climate on (i) the localization of large Andean landslides in the Western Cordillera and on (ii) the long-term mass transfer to the trench along the arid Andean front.

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Enhanced rock‐slope failure following ice‐sheet deglaciation: timing and causes

Ballantyne

Wilson

Gheorghiu

et al. 2013

Earth Surf Processes Landf

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The temporal pattern of rock-slope failures (RSFs) following Late 12Pleistocene deglaciation on tectonically stable terrains is controversial: previous 13 studies variously suggest (1) rapid response due to removal of supporting ice 14 ('debuttressing'), (2) a progressive decline in RSF frequency, (3) a millennial-scale 15 delay before peak RSF activity. We test these competing models through 10 Be Stadial glacial limits, but that runout debris was removed by LLS glaciers. 36Keywords: Rock-slope failure; paraglacial; surface exposure dating; stress release; 37 palaeoseismicity. 2002; Leith et al., 2011; McColl, 2012 Cormier et al., 2005; Agliardi et al., 2009; El Bedoui et al., 2009; Hippolyte et al., 58 2009), to constrain the extent of Pleistocene glacier advances 59 2011), to determine the level of hazard at former landslide sites (Welkner et al., 2010), 60to estimate long-term rates of pre-failure sliding (Hermanns et al., 2012) and to 61 determine the contribution of RSFs to postglacial denudation and landscape evolution 62 (Barnard et al., 2001; Antinao and Gosse, 2009; Seong et al., 2009; Hewitt et al., 63 2011; Shroder et al., 2011). The timing of individual dated RSFs has been variously 64 related to deglacial unloading and stress release (Cossart et al., 2008; Shroder et al., 65 Gosse, 2009; Sanchez et al., 2010; Stock and Uhrhammer, 2010; Hermanns and 67 Niedermann, 2011; Hewitt et al, 2011; Penna et al., 2011) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 that dip ESE at 25-40° and are locally intruded by doleritic dykes (Walker, 1961; 132 Anderton, 1976 132 Anderton, , 1977 132 Anderton, , 1985. 134When the last British-Irish Ice Sheet reached its maximum extent at ~27-26 ka, 135westwards-moving ice crossed Jura and extended to the Atlantic shelf edge, 195 km 136 west of the island (Hubbard et al., 2009; Clark et al., 2012 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 to 7% younger. Where citation of both ages is necessary, the age derived using LL 288LPR is cited first, followed in brackets by the age derived using NWH11.6 LPR. 290An additional advantage of using LPRs is that the variability amongst different 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 1 2 3 4 5 6 7 8 9 ...

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Quaternary tephrochronology helps define conditioning factors and triggering mechanisms of rock avalanches in NW Argentina

Cited by 34 publications

References 43 publications

³⁶ Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

³⁶ Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

Tectonic and climatic controls on the Chuquibamba landslide (western Andes, southern Peru)

Enhanced rock‐slope failure following ice‐sheet deglaciation: timing and causes

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Quaternary tephrochronology helps define conditioning factors and triggering mechanisms of rock avalanches in NW Argentina

Cited by 34 publications

References 43 publications

36 Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

36 Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

Tectonic and climatic controls on the Chuquibamba landslide (western Andes, southern Peru)

Enhanced rock‐slope failure following ice‐sheet deglaciation: timing and causes

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³⁶ Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina

³⁶ Cl terrestrial cosmogenic nuclide dating suggests Late Pleistocene to Early Holocene mass movements on the south face of Aconcagua mountain and in the Las Cuevas–Horcones valleys, Central Andes, Argentina