Unravelling the patterns of alluvial fan development using mineral magnetic analysis: examples from the Sparta Basin, Lakonia, southern Greece

Pope, Richard J.; Millington, Andrew

doi:10.1002/1096-9837(200006)25:6<601::aid-esp94>3.0.co;2-m

Cited by 23 publications

(2 citation statements)

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“…It is noted that there is a shifting of the main locus of deposition from the proximal to the distal end of the fan. This is consistent with the findings of Pope and Millington () on the patterns of alluvial fan development. In the current stage of development, the distal end of the fan has developed a steeper profile, which is seen by the incipient entrenchment observed in the field. The fan entrenchment demonstrates that sediment storage in fans is temporally variable (Betts et al ., ; Faulkner, ), and changes in the balance of morphodynamic processes may lead to slope‐channel coupling, resulting in the flushing and release of sediment into the fluvial system.…”

Section: Discussionsupporting

confidence: 93%

Gully Fan Morphodynamics in a Small Catchment in the Eastern Cape, South Africa

et al. 2012

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Fans, in association with hillslope gullies and badlands and their impact on the catchment sediment cascade, slope‐channel connectivity and local landscape evolution, have been reported in diverse geomorphic environments. However, research on the development and morphodynamics of gully fans is still in its infancy in South Africa. An investigation was undertaken in mid‐slope discontinuous gullies in the Eastern Cape Province of South Africa using field surveys and sediment source fingerprinting techniques to establish the dynamics of fan systems and their impacts on‐slope sediments. Findings showed that a sediment core collected from the upper region of the fan was composed mainly of sediment mobilised from subsurface sources, whereas that from the lower region of the fan consisted mostly of sediment from surface sources. 137Cs data were consistent with the sediment source fingerprinting results, confirming the respective surface and subsurface origins of the sediment in the sampled cores. Additionally, 137Cs pointed to the recent formation of the fan. Geomorphic reconstruction of the fan did not support a cut and fill mode of gully fan development. Rather, the fan formed as a consequence of discontinuous gullies in the mid‐slope leading to on‐slope sediment deposition and slope‐channel decoupling. It was also observed that hillslope sediment storage in the gully fan is temporally variable. Changes in the balance of morphodynamic processes may lead to sediment flushing and slope‐channel coupling. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Discussionsupporting

confidence: 93%

Gully Fan Morphodynamics in a Small Catchment in the Eastern Cape, South Africa

et al. 2012

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“…Such sediments are often enriched in iron oxides whose concentration and grain size variations can reflect long‐term climate changes that are otherwise elusive to assess because of the generally widespread lack of high‐resolution paleoenvironmental (e.g., paleontologic) data from such environments. Regardless, most alluvial and fluvial sediments have been the focus of environmental magnetic studies not for their intrinsic interest but mostly because they constitute the material from which lithogenic sediment is partially derived and on which pedogenic processes have acted (seeSection 4.1.3) [ White and Walden , 1997; Pope and Millington , 2000; Bógalo et al , 2001; Kumaravel et al , 2005; Sinha et al , 2007; Franke et al , 2009; Gómez‐Paccard et al , 2012]. In addition to their environmental significance, fluvial sediments have been studied in source to sink studies [e.g., Salomé and Meynadier , 2004; Horng and Roberts , 2006; Horng and Huh , 2011] to aid interpretation of marine sedimentary records.…”

Section: Recent Developments In Environmental Magnetismmentioning

confidence: 99%

Environmental magnetism: Principles and applications

Liu

Roberts

Larrasoaña

et al. 2012

Reviews of Geophysics

565

405

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In environmental magnetism, rock and mineral magnetic techniques are used to investigate the formation, transportation, deposition, and postdepositional alterations of magnetic minerals under the influences of a wide range of environmental processes. All materials respond in some way to an applied magnetic field, and iron‐bearing minerals are sensitive to a range of environmental processes, which makes magnetic measurements extremely useful for detecting signals associated with environmental processes. Environmental magnetism has grown considerably since the mid 1970s and now contributes to research in the geosciences and in branches of physics, chemistry, and biology and environmental science, including research on climate change, pollution, iron biomineralization, and depositional and diagenetic processes in sediments to name a few applications. Magnetic parameters are used to routinely scan sediments, but interpretation is often difficult and requires understanding of the underlying physics and chemistry. Thorough examination of magnetic properties and of the environmental processes that give rise to the measured magnetic signal is needed to avoid ambiguities, complexities, and limitations to interpretations. In this review, we evaluate environmental magnetic parameters based on theory and empirical results. We describe how ambiguities can be resolved by use of combined techniques and demonstrate the power of environmental magnetism in enabling quantitative environmental interpretations. We also review recent developments that demonstrate the mutual benefit of environmental magnetism from close collaborations with biology, chemistry, and physics. Finally, we discuss directions in which environmental magnetism is likely to develop in the future.

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Dryland Alluvial Fans

Harvey

2011

Arid Zone Geomorphology

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Unravelling the patterns of alluvial fan development using mineral magnetic analysis: examples from the Sparta Basin, Lakonia, southern Greece

Cited by 23 publications

References 22 publications

Gully Fan Morphodynamics in a Small Catchment in the Eastern Cape, South Africa

Gully Fan Morphodynamics in a Small Catchment in the Eastern Cape, South Africa

Environmental magnetism: Principles and applications

Dryland Alluvial Fans

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