Complex weathering in drylands: Implications of ‘stress’ history for rock debris breakdown and sediment release

Warke, Patricia

doi:10.1016/j.geomorph.2006.03.038

Cited by 32 publications

(24 citation statements)

References 22 publications

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“…Some relatively recent studies do consider a possible role for insolation, but do not specifically address directional insolation (e.g. Hall, 1999;Goudie and Viles, 2000;Viles, 2005;Warke, 2007). These studies focus on a variety of thermal-mechanical processes that may lead to cracking including thermal shock and thermal fatigue.…”

Section: Introductionmentioning

confidence: 99%

Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation

et al. 2010

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“…Because weathering conditions within the natural environment are so complex, and because each fragment of rock can carry a unique weathering-related legacy of damage and alteration, the weathering response of debris to changes in environmental conditions through spatial relocation may widely differ, with some debris readjusting to new conditions through accelerated breakdown while other material, often of the same lithology, remains relatively stable and apparently unchanging (Warke, 2007). Any change in the rate of debris breakdown may have significant implications for the amount of fine sediment available for subsequent aeolian and/or fluvial mobilization.…”

Section: Inheritance and The Concept Of Palimpsestmentioning

confidence: 99%

4.12 Weathering in Arid Regions

Warke¹

2013

Treatise on Geomorphology

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“…The loose materials are found at several topographic locations, including the highest and flattest portions of the relief, and they are classified as eluvium (in place) and colluvium, which were transported from higher to lower altitudes by gravitational flows. Even loose material could be partially transported to drainage channels, where the so-called alluvial deposits are constituted (Bigarella and Mousinho, 1965;Warke, 2007). The study of depositional dynamics allowed identifying and understanding the landscape's evolutionary sequence and chronology of obtained data.…”

Section: Introductionmentioning

confidence: 99%

Quaternary deposits in the Serra da Capivara National Park and surrounding area, Southeastern Piauí state, Brazil

Santos

Barreto

Suguío

2012

Geol. USP, Sér. cient.

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Serra da Capivara National Park and surrounding areas in Southeastern Piauí State (Brazil) were subjected to morphostratigraphical, sedimentological, and geochronological studies about superficial deposits in order to interpret quaternary paleoenvironmental events. The following sedimentary deposits associated with morphostructural units were identified: colluvial fans at Serra Branca Valley and Structural Staircases, and eluvial-colluvial deposits at Reverse of the Cuesta. There are also colluvial and alluvial deposits outside Serra da Capivara National Park. Many colluvial and alluvial deposits are contemporaneous and indicate a semiarid climate. According to luminescence dating (thermoluminescence and optically stimulated luminescence), the present landscape evolution began around 436 ± 51.5 ka when the Piauí River deposited clayey sediments. From 296.55 ± 46.95 ka to 116.3 ± 19.52 ka, the fluvial channel likely exhibited a braided pattern and deposited sand and gravel bars. Penecontemporaneous sands and muds with ages ranging from 202.75 ± 32.81 ka, 135 ± 16.4 ka to 117 ± 14.5 ka were deposited on Serra da Capivara National Park hillslopes. A colluviation episode occurred between 84.7 ± 13.4 ka to 76.2 ± 9.35 ka, which lacks correlatable alluvial deposits. In the Northern hemisphere last glacial maximum, the colluviation and alluviation processes intensified. These depositional processes likely occurred between 15.8 ± 1.9 and 10.35 ± 1.76 ka, during the Holocene-Pleistocene transition.Keywords: Sedimentary deposits; Morphostratigraphical; Sedimentology; Luminescence dating; Quaternary paleoenvironmental; Serra da Capivara National Park. ResumoNo Parque Nacional Serra da Capivara e nas circunvizinhanças, na região Sudeste do Piauí, no Brasil, foram realizados estudos morfoestratigráficos, sedimentológicos e geocronológicos de depósitos superficiais para a interpretação de eventos paleoambientais, principalmente paleoclimáticos quaternários. Os depósitos sedimentares associados às unidades morfoestruturais são: leques coluviais no Vale da Serra Branca; depósitos elúvio-coluviais no Reverso da Cuesta e depósitos coluviais do Patamar Estrutural. Fora do Parque Nacional Serra da Capivara ocorrem também colúvios e depósitos aluviais do Rio Piauí. Muitos depósitos coluviais e aluviais são contemporâneos e indicativos de clima semiárido. De acordo com datações obtidas por luminescência (termoluminescência e luminescência opticamente estimulada), a evolução da paisagem atual iniciou-se há no mínimo 436 ± 51,5 ka, quando o rio Piauí depositou sedimentos argilosos. Entre 296,55 ± 46,95 ka e 114,8 ± 14,2 ka, o canal fluvial deste rio exibia provavelmente padrão entrelaçado e depositava barras de areia e cascalhos. Areias e lamas penecontemporâneas, com idades entre 202,75 ± 32,81 ka, 135 ± 16,4 ka e 117 ± 14,5 ka, foram depositadas nas vertentes do Parque Nacional da Serra da Capivara. Novo episódio de coluviação ocorreu entre 84,7 ± 13,4 ka a 76,2 ± 9,35 ka, sem depósitos aluviais correspondentes. Durante o últ...

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Complex weathering in drylands: Implications of ‘stress’ history for rock debris breakdown and sediment release

Cited by 32 publications

References 22 publications

Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation

Cracks in desert pavement rocks: Further insights into mechanical weathering by directional insolation

4.12 Weathering in Arid Regions

Quaternary deposits in the Serra da Capivara National Park and surrounding area, Southeastern Piauí state, Brazil

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