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Differences in the reconstructions of the depositional environment of overbank sediments performed using the C/M diagram and cumulative curve analyses

Liro M.

Landform Analysis

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2015

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Vol. 29

35--40

EN

In order to compare the results of the reconstructions of depositional environment of sediments performed using the C/M diagram (Passega, Byramjee 1969) and the cumulative curve analysis (Visher 1969), 49 samples of overbank sediment were collected in the valley of the Dunajec River. The samples were collected from the fill of an abandoned channel on the floodplain of the lower Dunajec (17 km from its mouth) and from the floodplain of the Dunajec in the backwater of the Czorsztyn Reservoir and analysed used the laser diffraction and sieve methods. A cumulative curve analysis of the samples located in the fields of dominant deposition from traction in the C/M diagram (Fields I, II, III, IX) showed that the dominant type of their transport prior to deposition was saltation and suspension (81%), while traction amounted to an average of 19%. In the fields of the C/M diagram corresponding to the deposition of graded suspension under the conditions of high (Field IV) and moderate turbulence (Field V), the dominant type of sediment transport before deposition was saltation, whose amounted to 78–86% (Field IV) and 50–76 % (Field V). In the fields of the C/M diagram indicating deposition from graded suspension transported in conditions of low turbulence (VI) and uniform suspension of varied grain size (VII), the dominant type of transport prior to deposition was suspension, amounting to 35–94%. Sediments located in the field of the C/M diagram corresponding to the finest uniform suspension and pelagic suspension (Field VIII) were in 91–95% transported in suspension prior to deposition.

2

Pragmatyczne podejście do adsorpcji w skałach łupkowych złóż typu shale gas

Dudek L., Kowalska-Włodarczyk M.

Nafta-Gaz

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2014

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R. 70, nr 7

416--424

PL

W publikacjach przedstawiono wyniki badań 32 próbek sylurskich skał łupkowych wykonanych na aparaturze Tristar II 3020 w celu pomierzenia powierzchni właściwej i wykreślenia krzywej kumulacyjnej rozkładu średnic porów powyżej 1 nm. Pomiar umożliwia wyznaczanie krzywej kumulacyjnej objętości porów w funkcji ich średnicy (BJH - adsorpcja lub desorpcja i pomiar powierzchni właściwej BET). Analizy te pozwolą na wykonanie obliczeń parametrów charakteryzujących właściwości zbiornikowe skały (będącej jednocześnie skałą macierzystą i uszczelniającą), do których należy zaliczyć: porowatość całkowitą, gęstość materiałową i objętościową oraz rozkład średnic porów do mikroporów do makroporów, a także powierzchnię właściwą.

EN

This publication describes research work conducted on 32 samples of Silurian Shale Rocks using Tristar II 3020measuring their Specific Surface Area and plotting pore diameter distribution accumulation curves from diameters above 1 nm. The measurement allows plotting pore volume accumulation curves as a function of pore diameter (BJH - adsorption / desorption and BET specific surface measurement). The resultant analyses allow characteristic calculations for container rock (which is also both the source rock and the seal rock) which includes: total porosity, mass and bulk densities and the distribution of pore diameter from micro- to macro-pores and also the specific surface.

3

Alternative interpretations of grain-size data from Quaternary deposits

Mycielska-Dowgiałło Elżbieta, Ludwikowska-Kędzia Małgorzata

Geologos

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2011

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Vol. 17, No. 4

189--203

EN

Several possibilities to present and to interpret the results of granulometric analyses of Quaternary fluvial, aeolian, glacial and wash-out slope deposits were investigated. Attention is paid particularly to the cumulative curves at a probability scale and the frequency curves, and it is shown how these curves can help to determine the sedimentary environment. The inclination of the cumulative curves in the part of the maximum proportion of a particular grain size appears significant. It appears possible to obtain information on the density and dynamics of the transporting medium from the course of the cumulative curves (inclination and spread of grain size). The examination of textural parameters allows to draw regression lines characteristic of both deposits from various sedimentary environments and deposits from one single environment but with different histories as to their transport dynamics.