Pleistocene sandur deposits represent braidplains, not alluvial fans

Zieliński, Tomasz; Loon, A.J. van

doi:10.1111/j.1502-3885.2003.tb01238.x

Cited by 27 publications

(42 citation statements)

References 103 publications

(109 reference statements)

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“…A quite similar lithological character of braided-like river alluvium has been documented from the Carboniferous of Ireland (Graham, 1981) and the Pleistocene of Poland (Krzyszkowski, 1991). Additionally, similar fluvial records have been identified by Fraser & Cobb (1982), Dawson & Bryant (1987) and Zieliński & Van Loon (2003) from the distal parts of sandurs.…”

Section: Discussionsupporting

confidence: 68%

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Unusual development of sandur sedimentary succession, an example from the Pleistocene of S Poland

Salamon¹,

Zieliński²

2010

Geologos

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An atypical lithological development of outwash deposits in the Carpathians Foreland (S Poland) shows lower and middle parts of the sedimentary succession that are characterized by sinuous palaeochannels. This channel facies consists of laterally accreted sands derived from side bars. The sedimentary environment was a proglacial system of anabranching channels, presumably of anastomosed type. The outwash channel pattern was most probably controlled by the raising base level of the fluvial system. Both proglacial and extraglacial waters were dammed by a sandur within a small upland valley. Aggradation and progradation of the glaciofluvial deposits resulted in progressive rising of the dammed lake level. The low hydraulic gradient of the outwash streams resulted in a sinuous planform as well as a lowenergy style of deposition. Afterwards, the rising lake water was drained off through a low watershed and the entire valley became filled with outwash sediments. The bedrock morphology thus became buried and a typical unconfined sandur with a braided channel network developed during the last phase of the glaciomarginal sedimentation (upper part of the sedimentary succession under study).

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Section: Discussionsupporting

confidence: 68%

“…The significance of sheetflows increases espe-cially in the distal parts of outwashes (cf. Krigström, 1962;Olsen & Andreasen, 1995;Aitken, 1998;Zieliński & Van Loon, 2003).…”

Section: Introductionmentioning

confidence: 99%

Unusual development of sandur sedimentary succession, an example from the Pleistocene of S Poland

Salamon¹,

Zieliński²

2010

Geologos

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“…Zieliński 1993, Pisarska--Jamroży 2008. Rozpoznane zostały cechy charakterystyczne dla sedymentacji w strefach proksymalnej, środkowej i dystalnej na sandrach (Zieliński 1993, Zieliński, van Loon 2003. Zwracano uwagę na charakterystyczne zespoły litofacji w osadach sandrowych, wskazując na ich znaczenie w interpretacji lokalnych warunków subśrodowisk sedymentacji oraz ponadlokalnych, uwarunkowanych klimatycznie.…”

Section: Wstępunclassified

“…Osady te były transportowane w saltacji, ze znacznym udziałem trakcji (wyraźnie zaznacza się na krzywych człon populacji łączonej z trakcją). Duży udział warstwowania przekątnego, które jest charakterystyczne dla rzek roztokowych, wskazuje, że depozycja następowała głównie w korycie, rzadziej z zalewów warstwowych (Miall 1977, Zieliński 1993, 2014, Zieliński, van Loon 2003.…”

Section: Warunki Sedymentacji Osadów Wodnolodowcowychunclassified

Cechy sedymentologiczne osadów wodnolodowcowych w żwirowni Łubienica-Superunki (SE części Wysoczyzny Ciechanowskiej)

2017

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Zarys treści: Praca zawiera charakterystykę sedymentologiczną osadów sandrowych występujących pod niewielkiej miąż-szości gliną lodowcową w południowo-wschodniej części Wysoczyzny Ciechanowskiej, w pobliżu strefy krawędziowej z doliną Narwi. W artykule przedstawiono opis sekwencji struktur sedymentacyjnych widocznych w żwirowni Łubie-nica-Superunki i próbę interpretacji warunków transportu i depozycji osadów wodnolodowcowych. Występują tu dwa kompleksy osadów, z których dolny był akumulowany w roztoce piaskodennej, a górny w roztoce o większej dynamice przepływów (ze znacznie większym udziałem żwirów) przed nasuwającym się czołem lądolodu.Słowa kluczowe: osady wodnolodowcowe, sedymentacja sandrowa, plejstocen, Wysoczyzna Ciechanowska Abstract: This paper presents the sedimentological characteristics of outwash sediments occurring under a glacial till of a small thickness, in the south-eastern part of the Ciechanowska Upland, near the edge of the Narew Valley. The article presents description of the sequence of sedimentation structures visible in the Łubienica-Superunki quarry. There are two complexes of fluvioglacial sediments. The bottom part visible in the studied outcrops were accumulated in sand-bed braided river whilst the upper part of sediments developed in sandy-gravel braided river of a greater flow dynamics (near front of the warta ice sheet margin).Key words: fluvioglacial deposits, outwash sedimentation, Pleistocene, the Ciechanowska Upland WstępBadania osadów sandrowych były często wykonywane zarówno na obszarze współczesnych rzek proglacjalnych (np.

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“…The high and very variable water discharges due to ice melting in highlands create ideal conditions for braided-plain development (Boothroyd and Ashley, 1975;Miall, 1978;Rust, 1978;Maizels, 1997;Zielinski and Van Loon, 2003). Moreover, this provided the necessary water for karst development.…”

Section: Sedimentological Datamentioning

confidence: 99%

Quaternary alluvial sinkholes: Record of environmental conditions of karst development, examples from the Ebro Basin, Spain

Asunción¹,

Luzón²,

Yuste³

et al. 2012

JCKS

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The central Ebro Basin is an exceptional region for studying karstification through time and under different environmental conditions, as sinkholes have been developing since the Early Pleistocene. Knowledge of active sinkholes is complemented with research on paleosinkholes and contemporary deposits. Sedimentological, mineralogical, geomorphological and structural approaches permit interpretation of the natural environmental conditions that favored karst in the past and the main genetic mechanisms involved. The sedimentary features of Pleistocene terraces indicate that they were deposited by a gravel braided fluvial system characterized by higher water and sediment availability than today, probably related to meltwater flows coming from glaciated source areas, mainly in the Pyrenees. Genesis of paleosinkholes was mainly linked to this high water supply. Some of them acted as small lakes where fine sediments are exceptionally well conserved to give clues about environmental conditions. The neoformation of palygorskite and sepiolite suggests arid to semiarid climatic conditions, in agreement with the idea of cold glacial episodes. During Pleistocene times, development of sinkholes was influenced by tectonics. Currently, the genesis and evolution of numerous sinkholes are also influenced by water supplies from human activities such as irrigation or urbanization, sharply changing the nearly steady state exhibited in the past.

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Pleistocene sandur deposits represent braidplains, not alluvial fans

Cited by 27 publications

References 103 publications

Unusual development of sandur sedimentary succession, an example from the Pleistocene of S Poland

Unusual development of sandur sedimentary succession, an example from the Pleistocene of S Poland

Cechy sedymentologiczne osadów wodnolodowcowych w żwirowni Łubienica-Superunki (SE części Wysoczyzny Ciechanowskiej)

Quaternary alluvial sinkholes: Record of environmental conditions of karst development, examples from the Ebro Basin, Spain

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