The sieve lobe paradigm: Observations of active deposition

Milana, Juan Pablo

doi:10.1130/g30504.1

Cited by 15 publications

(39 citation statements)

References 8 publications

(7 reference statements)

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“…That our values lie outside the range summarized by Harvey (2011) could be due to the steep nature of the eroded alcoves not fitting well with the area-area relation. Interestingly, values for the pali fans match those obtained from measurements of alluvial fans in southern Argentina described by Milana (2010) as having been formed almost entirely from sieve lobe deposition.…”

Section: Morphometrysupporting

confidence: 72%

“…The Hilina Pali fans meet all of these conditions. The sieve depositional lobes present on these fans are somewhat larger than those described on fans in the Death Valley region or Argentina (Hooke, 1967;Milana, 2010), but this is likely due to the very large sediment size (boulders) of deposited sediment making up the lobes.…”

Section: Discussionmentioning

confidence: 66%

“…Later researchers argued that such conditions do not occur in nature and that the sieve lobe model is based on the erroneous interpretation of weathered, fine-winnowed debris flow deposits (Blair and McPherson, 1992, 2009. Following Blair and McPherson's (1992, 2009) rejection of the sieve lobe model, the term fell out of usage, but has recently been revived as a fundamental process in describing alluvial fan formation and architecture (Milana, 2010;Chen et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Depositional processes of alluvial fans along the Hilina Pali fault scarp, Island of Hawaii

Morgan

Craddock

2017

Geomorphology

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A series of previously unstudied alluvial fans are actively forming along the Hilina Pali escarpment on the south flank of Kīlauea volcano on the Island of Hawaii. These fans are characterized by their steep slopes, coarse grain sizes, and lobate surface morphology. Fans are fed by bedrock channels that drain from the Ka'ū Desert, but sediment is mostly sourced from deeply eroded alcoves carved into the Hilina Pali. Examination of recent deposits indicates that the fans are dominantly constructed from gravel and larger sized sediment. Flow discharges calculated using field measurements of channel geometries and the Manning equation indicate that events inducing sediment transport are of high magnitude and occur during high intensity precipitation events, including Kona storms. The fans along the Hilina Pali appear to be a rare example of fans formed predominately from sieve lobe deposition owing to the area's high slopes, high discharge, coarse bedload, and limited supply of finegrained sediment. Given such conditions, sieve lobe deposition can form large lobes consisting of bouldersized material, which may have implications for the identification of depositional processes when interpreting the stratigraphic record.

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Section: Morphometrysupporting

confidence: 72%

Section: Discussionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

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Depositional processes of alluvial fans along the Hilina Pali fault scarp, Island of Hawaii

Morgan

Craddock

2017

Geomorphology

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“…Firstly, there were lobes surrounding the outflow pits that were the result of sediment emerging from the pit, similar to a sand-volcano. Further downstream, we observed lobes of sediment eroded from the initial valley head that deposited due to infiltration of water, also known as sieve-deposits [44] (Fig. 1f).…”

Section: Experimental Outflow Processes and Morphologymentioning

confidence: 95%

Pressurized groundwater systems in Lunae and Ophir Plana (Mars): Insights from small-scale morphology and experiments

Marra

Hauber

Jong

et al. 2015

GeoResJ

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a b s t r a c tOutflow channels on Mars reveal the past presence of water, possibly released from pressurized groundwater reservoirs. We aim to improve our understanding of such outflow systems in order to better constrain past hydrological conditions on Mars. We investigate the morphology of possible pressurized groundwater outflow systems on Mars and compare them to landscape evolution experiments. These experiments show that incised channels, like the classic outflow channels, form in a last, erosional, stage in morphological development. This is preceded by the formation of sedimentary lobes due to rapid water loss by infiltration. On Mars, we observe similar morphologies related to different stages of groundwater outflow in Lunae and Ophir Plana. In the experiments, pits formed by the pressure of the groundwater, whereas the pits in the source regions of the outflow channels relate to the regional tectonic structure and are not formed by groundwater alone. Faulting, subsidence and collapse likely triggered outflow from a pressurized aquifer. This scenario is consistent with the presence of one or several cryosphere-confined aquifers from the Early Hesperian to at least the middle Amazonian. A pronounced spatial trend of larger and further developed outflow systems at lower elevations suggests that features ranging from small lobes to large outflow channels were sourced from a common aquifer or from aquifers with similar pressures. The required cryosphere indicates a cold climate and enables groundwater outflow even under atmospheric conditions unfavorable for sustained presence of liquid water.

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“…Los abanicos tipo I están dominados por depósitos de fl ujos de detritos y tienden a formarse donde las áreas de las cuencas son pequeñas y profundas y donde el trabajo geológico produce abundante sedimento fi no. Los abanicos de fl ujos de detritos tienden a ser comunes en regiones áridas donde las precipitaciones esporádicas son normales, mientras que los abanicos tipo II son más comunes en climas húmedos y en cuencas amplias, lo que produce una inferior cantidad de sedimentos fi nos (Ritter et al 2006, Strahler 1992, Milana 2010.…”

Section: Introductionunclassified

El modelo periglacial de los abanicos aluviales telescópicos: análisis en dos cuencas precordilleranas (31º 51’ S y 68º 28’ W)

Suvires

2011

RBG

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Revista Brasileira de Geociências 41(3): 558-564, setembro de 2011Arquivo digital disponível on-line no site www.sbgeo.org.br 558 El modelo periglacial de los abanicos aluviales telescópicos: análisis en dos cuencas precordilleranas (31º 51' S y 68º 28' W) Resumen Este trabajo muestra un modelo de distribución de abanicos aluviales segmentados o también llamados telescópicos en dos cuencas afl uentes del río San Juan, dentro del ambiente de Precordillera, provincia de San Juan, Argentina. Las cuencas se ubican entre los 31º 31´ 23¨ S y 68º 53` 44"O y los 31º31'04´´S y 68º55`20´´O, entre los 926 y los 905 m.s.n.m. respectivamente. Los análisis morfográfi cos y morfométricos de los abanicos-terrazas que conforman los abanicos telescópicos, a través de análisis de imágenes satelitales y fotografías aéreas, arrojaron resultados que demuestran una mínima participación de la actividad tectónica local. Solo a partir del abanico-terraza 2 se presenta un quiebre de pendiente que podría explicarse a esa actividad. Los ensayos de laboratorio efectuados mediante diferentes relaciones de w/s (agua versus sedimentos), con una pendiente constante de la cuenca, dieron modelos de los diferentes abanicos-terrazas. Las sucesiones entre fl ujos de diferentes w/s sería la causa predominante de la disposición segmentada de estos abanicos. Los procesos estarían vinculados a episodios más fríos con abundante producción de sedimentos fi nos crioclásticos y más cálidos y húmedos que facilitaron el transporte y la formación de distintos fl ujos. Estos abanicos telescópicos responderían a un modelo periglacial instalado en el ambiente de Precordillera, en el sector de los Andes Centrales. Se concluye que la formación de los distintos niveles de abanicos-terrazas que componen un sistema telescópico, se forman por diferencias en la relación carga sedimentaria versus disponibilidad de agua y que los abanicos segmentados no siempre tienen edades menores aguas abajo.Palabras clave: Flujos; ensayos de laboratorio, causas de formación, modelos de abanicos periglaciales, morfometría. Abstract Model of alluvial fans periglacial telescopic: analysis in two precordilleran basins (31º 51' s and 68º 28' w).This paper shows a model of distribution of segmented alluvial fans also called telescopic in two tributaries basins of the San Juan River, within precordilleran mountainous area, at the central part of the province of San Juan, Argentina. These basins lies between 31º 31´ 23¨ S and 68º 53` 44" W and the 31º31'04´´S and 68º55`20´ W, from 926 to 905 m.a.s.l. altitude. Through analysis satellites images and aerial photographs interpretation, the morphografi c and morphometric measurements were made in each one of the fans-terraces. Some results allow that a minimum participation of the tectonic modern activity, only from the fan-terrace 2 to fan-terrace 3 presents a break into slope basin that could be explain as neotectonic action. The essays of laboratory were obtained by means of fl ows with different relations of w/s (water versus detritus load) an...

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The sieve lobe paradigm: Observations of active deposition

Cited by 15 publications

References 8 publications

Depositional processes of alluvial fans along the Hilina Pali fault scarp, Island of Hawaii

Depositional processes of alluvial fans along the Hilina Pali fault scarp, Island of Hawaii

Pressurized groundwater systems in Lunae and Ophir Plana (Mars): Insights from small-scale morphology and experiments

El modelo periglacial de los abanicos aluviales telescópicos: análisis en dos cuencas precordilleranas (31º 51’ S y 68º 28’ W)

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