Wyniki wyszukiwania - BazTech

1

What was the interglacial river like? Sedimentological investigation of Holsteinian fluvial deposits in eastern Poland

Zieliński T., Terpiłowski S., Zieliński P., Pidek I. A., Godlewska A., Czubla P.

Geological Quarterly

|

2016

|

Vol. 60, No. 1

149--166

EN

Holsteinian fluvial deposits in the Samica River valley in eastern Poland have been studied, in an approximately 12-m-thick succession filling palaeochannels and comprising sandy channel facies succeeded by a package of gyttja, peat and silt deposited in oxbow. Channel belts including palaeochannel fills cut into outwash sands and are overlain by diamictic sands reworked by solifluction under periglacial conditions. Sedimentological and palynological investigations in combination allowed the recognition of glacial and interglacial deposits. The channel belt was formed by a typical sand-bed, meandering river with deposition controlled by abundant point bars. The sedimentary evolution of the Samica valley is interpreted in the context of the glacial-interglacial cycle. Valley-scale erosion and change of river style from braided to meandering occurred coevally with the decay of an ice sheet (deglaciation) and the main phase of meandering river sedimentation is attributed to latest Elsterian and early Holsteinian. The next part of the interglacial, from pioneer stage to established temperate conditions, is recorded in a biogenic oxbow-lake fill. The succession studied has been compared with published data on the European fluvial deposits of Middle Pleistocene interglacials. It is pointed out here that river channel patterns in western and eastern Europe differed. Based on this observation, some general hypotheses regarding the continental-scale climatic distinctness are put forward.

2

How to resolve Pleistocene stratigraphic problems by different methods? A case study from eastern Poland

Terpiłowski S., Zieliński T., Kusiak J., Pidek I.A., Czubla P., Hrynowiecka A., Godlewska A., Zieliński P., Małek M.

Geological Quarterly

|

2014

|

Vol. 58, No. 2

235--250

EN

Different methods have been used to determine the stratigraphic position of Pleistocene alluvial deposits, particularly fluvial interglacial deposits. Near-surface deposits of a meandering river, developed in point-bar and oxbow lake facies, in the Samica River valley (near Łuków, eastern Poland) have been investigated. The fossil valley is incised into the till plain and the outwash. The fluvial succession is locally overlain by solifluction deposits. All the deposits underwent sedimentological analysis. The petrographic composition of basal till occurring in the vicinity of a fossil valley was determined with the method of indicator erratics. Fluvial deposits were examined by pollen analysis and plant macrofossil analysis of oxbow lake facies. Absolute dating methods were applied to the deposits (thermoluminescence methods: TL and additionally IRSL). Lithological differences between fluvial and the surrounding glaciofluvial deposits were identified and their lithostratigraphic position assigned. Petrographic analysis of till and palaeobotanical analyses of oxbow lake facies gave compatible results. Fluvial deposits were formed after the Sanian 2/Elsterian Glaciation, during the Mazovian/Holsteinian Interglacial. Luminescence dating of the fluvial deposits by the TLMAX method yielded the most relevant results (412-445 ka), which indicate that these deposits were formed during the end of the MIS 12 and beginning of the MIS 11 stage.

3

Influence of field and road pattern change on gully development in the Bug River valley side (E Poland)

Rodzik J., Terpiłowski S., Godlewska A.

Landform Analysis

|

2011

|

Vol. 17

145-149

EN

Causes of dynamic development of a permanent gully dissected in sandy river valley side were presented in this paper. Road and field pattern change conditioned the gully forming during one downpour. A new pattern and crop structure caused fast surface flow on the side. Flow concentration along the road and balks causes dissections of gully escarpments and development of the gully branches.